outboard fuel line size

He gave the AR line a specific name I don't remember. That allows air into the sealed fuel system on the motor, can affect the life of the electric fuel pump, and makes the motor harder to start as the air has to be purged before it will run well. Narrow By . Yes. Think “fuel line size”, and that BIGGER is always better, especially on the supply side with high performance engines. Quicksilver primer bulbs have a new check valve and ball spring to ensure proper fuel flow. The concern about the fuel hose and fittings being too small in diameter is for a restriction of fuel flow. 5/16" Barb Female fuel line tank or engine connector. The 5/16 feed the 85 hp Force with no problems. Since 1968, West Marine has grown to over 250 local stores, with knowledgeable Associates happy to assist. FREE Shipping Usually ships within 6 to 10 days. (The counter top is analogous to the pipe wall) The water lies on the counter as a small bubble. Yesterday while checking out the rest of the connections that need to be done, I noticed that the fuel line on the motor is 3/8". Since 1968, West Marine has grown to over 250 local stores, with knowledgeable Associates happy to assist. If I move the housing forward at all, I will not be able to access the filter easily for changes. Since 1968, West Marine has grown to over 250 local stores, with knowledgeable Associates happy to assist. The ½” line will result in a ½ pound drop versus the 3 pound drop for the 3/8” line at the stated flow of 83.3 gph (enough to support 1000 HP at a BSFC of .5). Fuel tanks are available in 25 liter (6.6 U.S. gallon) and 12 liter (3.1 U.S. gallon) sizes, and come standard with the fuel connectors and fuel gauge. Let’s double that to say 20 feet to take care of the bends in the steel pipe from the gasoline tank up to the engine fuel rail. Powered by: Ultimate Bulletin Board, Freeware Version 2000Purchase our Licensed Version- which adds many more features! In there they list the “Friction Of Water” thru various types of pipe. The key factors are viscosity and surface tension of the liquid being pumped. It is important to have the right size so the vehicle operates efficiently. Competitor primer bulbs have an inferior check valve that can stick when it’s closed. Most owner’s manuals will tell you the size fuel hose they recommend for your engine. From: $5.25 . The fuel line after the pump can be the next smaller size. Thanks Jason. The alcohol broke down the surface tension and the water molecules were free to move. I am not sure if there is enough difference to worry about fuel starvation, especially since the hose from filter to motor is 5/16-inch. Alcohol greatly reduces that tension. Boat Motor Fuel Line Hose with connector and Primer Assy 6Y2-24306-55-00 6Y2-24306-56-00 for Yamaha Outboard Motors, 6mm/1/4in Pipe, 3m length 4.4 out of 5 stars 108 $33.89 $ 33 . Moeller 033471-10 Yamaha Fuel Line Tank/Engine Connector Attaches to fuel hose on the fuel tank side or the engine side. They don't pull it very well.) 17 Products . Using the pressure drop thru a new steel pipe of .364” id at 1.388 gpm (83.3 gph) we get a head loss of 35 feet per 100 feet of pipe with water as the medium. Given a big enough pump a 3/8” steel line could support 1000 HP. SouthMarine 6G1-24304-02 Fuel Line Connector Fittings for Yamaha Outboard Motor Fuel Tank Hose Pipe, 6mm Male,fmount on Engine 4.3 out of 5 stars 35 $12.89 $ 12 . Product Title Fuel Line Hose Outboard Primer Bulb fit Yamaha 6Y2-24306-56-00(Check for more model#) Average Rating: ( 1.0 ) out of 5 stars 3 ratings , based on 3 reviews Current Price $21.99 $ 21 . The key to sufficient fuel supply is pumping power. The reason I am making all these conversions for you is because typical fuel pump measurements are made in volume versus mass although mass is more accurate. Fuel Line Assembly, 3/8" Rubber Braided Marine Outboard Boat Motor RVs Fuel Hose Line Assembly with Primer Bulb Steel Hose Clamps 6FTFuel Assembly with Primer Bulb Steel Hose Clamps 6FT (3/8"-Rubber) 4.3 out of 5 stars 73 $15.99$15.99 Get it as soon as Thu, Oct 1 Next back to the fuel cutoff switch; based on the placement of the remote water sep filter housing, I would need to do an elbow out of the filter housing, attach the fuel shutoff valve, then the hose barb to the shutoff valve. I got the line TO the fuel pump at Westlake marine and the line from the pump to the carburetor from a Carquest store. Mfr: Sierra / Seastar Solutions. The series 337 fuel lines (Silverado 4000) is the best B1 fuel line in the market place THV500 barrier layer, a Nitrile jacket, Polyester reinforcement and a CPE cover $93.33 - $98.43 Seachoice® Primer Bulb When using E85, alcohol, methanol, etc. Our Mercury Outboard Fuel Lines & Fittings are at the lowest prices and same day shipping! The answer is “NO”! Will increasing the line size to ½” help? The result could be that a smaller diameter hose and fittings in the fuel system ends up causing damage to the outboard engine from a flow restriction. search | FAQ | Remote FF housing housing is located on the starboard wall of the bilge, just under the access hatch. Shop, read reviews, or ask questions about Fuel Lines at the official West Marine online store. I am doing this by placing an elbow coming out of the filter housing, then the cutoff valve, then barb fitting for outboard engine hose connection. The 25 can use either size line without a problem. If we use alcohol we need about double the flow or with E85 we need to increase the flow numbers by around 30 % . 1000 divided by 12 = 83.3 Gallons Per Hour or 315 Liters Per Hour. Fix of a Yamaha no start, hard start, caused by bad fuel connector and bad hose. The fuel line, along with the other parts of a fuel system, are responsible for delivering the fuel from the fuel cell into the carburetor. OK stay with me now as we calculate how much gasoline fuel we need to support say 1000 HP. Our Suzuki Outboard Fuel Lines & Fittings are at the lowest prices and same day shipping! Yes the pressure drop thru a ½” line is a nominal 5 feet versus 35 feet for the 3/8” id fuel line. Shop with confidence - get free shipping to home or stores + price match guarantee! Switching to a ½” id line would result in a pressure of about 1/10 of the 3/8” line. At full throttle settings a 200-HP engine with carburetors will probably be pulling 20-gallons-per-hour from the fuel system. Sort & Filter . 2 product ratings - OUTBOARD Fuel Line Attwood OMC Johnson Evinrude Fuel Line 6' Assembly Kit BOAT $19.99 Trending at $27.50 Trending price is based on prices over last 90 days. Shop, read reviews, or ask questions about WEST MARINE Mercury/Mariner O/B Standard Fuel Line Assembly, 6' x 3/8 at the official West Marine online store. 99 Now we are going to calculate the pressure drop thru a 3/8” steel line for a typical vehicle at a flow of 83.3 gph or 1000 HP. Don’t I need to increase the size of the fuel line to at least ½” id (from a #6 to a #8 or #10) to support say 600 HP”? It generally starts with a partial blockage, where playing around with the fuel hose and pumping the primer bulb will get the motor to start or keep it running. Order Marine - Fuel Lines for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. 89 Sierra 18-80403 Fuel Connector For Honda Sierra replacement fuel connector for late model Honda Outboards. Outboard Fuel Lines & Fittings. It does not appear there is enough room between the filter housing and the inside of the transom to install the fuel barb and the shut-off valve without the hose being kinked up against the transom. VISCOSITY SG plays no role in friction loss. Lots of strange information out on the internet regarding fuel line sizing and it seems like most of the time people run way more diameter fuel line than they need. Watch the water immediately spread out on the counter top. Place a small drop of water on a counter top. If you plan to replace existing hoses and fittings, I would use 3/8-inch ID hose and appropriate fittings, rather than use 5/16-inch. Consider that most greases have a lower SG than water but much higher viscosity. For OMC Pressurized Systems. SG simply determines the weight of the liquid per unit volume and it boils down to more weight requires more power (HP) to move it. Ogrmar Fuel Line Assembly 3/8" Inner Dia 5/8" Outer Dia Hose Line Marine Outboard Boat Motor RVs Fuel Assembly with Primer Bulb Steel Hose Clamps 6FT 4.4 out of 5 stars 1,282 $15.99 $ 15 . We recommend you install a 100 Micron In-Line Fuel Filter between the tank and the pump. You can check on the vacuum drop across the fuel system by adding a fuel pressure vacuum gauge to the system. Let’s see why today this is what I call a “wives’ tale”. $8.66 . I just had a Yamaha fuel line rot on a 2014 engine, I included the link for the full story. The simple way to know is to install an electronic fuel pressure gage. Quicksilver fuel lines and fittings are made of UV-resistant materials that prevent hardening. (External pumps push fuel. 89 At 500 HP the pressure drop is even less. © Infopop Corporation (formerly Madrona Park, Inc.), 1998 - 2000. If a cylinder runs lean, the cylinder temperature will be higher. If the pressure falls as the engine RPM’s go up you need more pump head. The pressure drop thru a 3/8”id line at 60 GPH is less than 1 psig! Which do you think flows more easily thru a pipe? Water has relatively high surface tension. The ½” line will result in a ½ pound drop versus the 3 pound drop for the 3/8” line at the stated flow of 83.3 gph (enough to support 1000 HP at a BSFC of .5). I have read in some places that 90 degree elbows are a no-no in fuel lines. The reason most people do not understand why is because “back in the day” when carburetors ruled and everybody ran a Holly electric fuel pump running at 14 psig then into a rail mounted PRV set to 6 psig the “pump head” was insufficient to overcome the pressure drop thru the 3/8” line: particularly if the pump was at the front of the vehicle. Will increasing the line size to ½” help? Anyone done this? In a classic two-stroke-power-cycle engine, the cylinder cooling is dependent of having plenty of fuel in the cylinder. Typically the fuel flow rate of a carburetor outboard engine of 200-HP would require the fuel hose and fittings in the line to be 3/8-inch diameter. If you put a drop of gasoline or alcohol (low surface tension liquids) on the counter top you see they immediately spread out. Friction loss is the mechanical resistance exercised by the pipe wall on the liquid. Sunnyglade 6FT Fuel Line Assembly 3/8" 5/16" Hose Line Marine Outboard Boat Motor RVs Fuel Assembly with Primer Bulb Steel Hose Clamps 4.0 out of 5 stars 136 $14.99$14.99 FREE Shipping on your first order shipped by Amazon Don’t touch the water but let a very small drop of alcohol drip into the water. Most of you know that the pressure drop thru a straight pipe is less than an elbow or a 45 (same principle as your air ducting from your blower thru the piping and on into the engine). I plan to put a 5/16 to 3/8 barb connector in the line for now. Yes. Low surface tension and/or low viscosity liquids overcome that resistance more easily. I am using all 1/4-inch brass fittings. If I use 20 feet of steel pipe then that is 1/5 of 15 or 3 psi using water (gasoline is less viscous and flows more freely). Moeller Marine Fuel Line Connector for Force Attaches to fuel hose on the fuel tank side or the engine side. We won’t go into why one chooses such rich air fuel ratios; suffice to say that using a BSFC of .5 is generous. 99 List List Price $27.90 $ 27 . The size of the fuel line is determined by the outside diameter. As another example let’s look at a flow of 1 gallon per minute at a required fuel rail pressure of 70 psig. I replaced all the stock Yamaha lines on the high pressure side with fuel injection line 5/16, which seems to be almost the exact diameter. Fuel Connector, 3/8" and 5/16" Mercury Marine, Chrysler/Force/US Marine. What is the consensus here on that? Shop Mercury Outboard Fuel Lines & Fittings at Wholesale Marine. At WOT (Wide Open Throttle) a BSFC (Brake Specific Fuel Consumption) of ½ pound of fuel per horsepower is quite safe: resulting in A/F ratios of 11:1 or richer. Remember that maximum HP occurs at an A/F ratio of 13:1. Shop, read reviews, or ask questions about Fuel Line Connectors at the official West Marine online store. A blocked outboard fuel line prevents fuel from getting to the motor. Click here to view dimensions of tank. I am also placing an in-line fuel cutoff valve between the filter and hose that runs to the engine so I can turn off the fuel before storage. There is usually a specification for an outboard engine for the most vacuum in the fuel system, typically being limited to about 4-PSI negative pressure. Offering discount prices on OEM Johnson/Evinrude, OMC parts for over 50 years. Mercury - Mariner Outboard Fuel Line Assemblies and Parts. Lets assume we have about 10 feet of 3/8” fuel line. 90 For this example I will use gasoline. A Fuelab Model 41401 can deliver 90 gph @ 70 psig. attwood 93806EUSD7 Johnson/Evinrude Fuel Line Kit, 6 Feet Long, 3/8-Inch Diameter, Includes Tank Fittings and Primer Bulb, One Size 5.0 out of 5 stars 10 Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35.00+. 2.31 feet of water = 1 psi therefore 35/2.31 = 15 psi per 100 feet. 5 In Stock - Ships Immediately. The NAPA dealer I first went to did not have the AR line in stock. Features rectangular locking post. But before you do check out the following (and remember a dirty fuel filter is often the culprit of falling fuel pressures!). One bit of advice, try not to run the motor dry before switching tanks. However, given sufficient pumping power, a one (1) pound drop versus a tenth (1/10) pound drop is insignificant. go up to the next bigger fuel line. Gasoline has lower viscosity and much lower surface tension than water, which is why it flows more easily thru a pipe. More pump head can be achieved with a bigger pump, higher pump voltage and/or increasing the line size. Check here for special coupons and promotions. The fuel line from the gas tank is 5/16". BTW, this is an area of misunderstanding with people. Shop with confidence - get free shipping to home or stores + price match guarantee! Since gasoline has a weight of 5.994 lbs/gallon (@ a SG of .7201 typical) then in round numbers we need 1 gallon of gasoline per 12 HP (5.994/.5). Sourced from http://www.blowerworks.biz/docs/fuel-delivery-basics/fuel-line-sizing/, -10an, -6an, -8an, an fittings, an line size, an to inch conversion, fuel line horsepower requirements, gas, horsepower fuel, how much fuel do i need, what size fuel line, http://www.blowerworks.biz/docs/fuel-delivery-basics/fuel-line-sizing/, SPEED World Challenge Touring Car Integra Type R, Customer Feature: Billy Wyatt’s Turbo D Series. Quick reference for AN to Inch line conversion: A question that is often asked of me when dealing with high horsepower applications is: “My fuel line is nominal 3/8” id. Can I tolerate a 3 psig drop if I need the fuel delivered at 60 psig? Here is a little experiment you can try. A 3/8”id fuel line can easily support 600 HP given sufficient “pump head”! That is enough fuel to support 720 HP. Shop Suzuki Outboard Fuel Lines & Fittings at Wholesale Marine. Shop with confidence - get free shipping to home or stores + price match guarantee! Ingersoll-Rand publishes an engineers’ handbook called “Cameron Hydraulic Data”. profile | register | author help, Is there any compelling reason to use 3/8-inch instead of 5/16-inch from fuel tank to filter? Ogrmar Fuel Line Assembly 3/8" Inner Dia 5/8" Outer Dia Hose Line Marine Outboard Boat Motor RVs … This ensures gravity feeds fuel to the pump. Completing the measurement is simple and takes relatively few tools. The pressure drop at 1320 HP thru a 3/8” steel line might be around 5 psi. ... Sierra 18-80419 Fuel Connector For Suzuki 5/16" Sierra replacement fuel connector for Suzuki Outboards. High cylinder temperature leads to problems. Sierra 18-8051 Double Fuel Line Assembly for Johnson, Evinrude Sierra 18-8051 is a replacement fuel line assembly for use with OMC, Johnson, and Evinrude engines. This is an interesting article that I came across that seems to be pretty relevant. Re: Help with 9.5 hp fuel line size 1964 I don't know about a price difference. Find FUEL LINE 5/16"ID - 0772564 here. SG becomes a factor if there is vertical lift of the liquid involved or very long pipe runs (which represent a large physical mass of liquid.) Yes the pressure drop thru a ½” line is a nominal 5 feet versus 35 feet for the 3/8” id fuel line. I have checked the parts manual sheets and do not see fuel hose listed anywhere. Checked the parts manual sheets and do not see fuel hose on liquid... Prices on OEM Johnson/Evinrude, OMC parts for over 50 years they for. Bulletin Board, Freeware Version 2000Purchase our Licensed Version- which adds many more features at the lowest and. Fuel Filter between the tank and the line size help with 9.5 HP fuel line Assemblies and.... Of pipe they recommend for your engine area of misunderstanding with people way to outboard fuel line size! Fuel system a fuel pressure gage fittings at Wholesale Marine are a in... Of UV-resistant materials that prevent hardening electronic fuel pressure gage advice, try not to run the dry... It is important to have the AR line a specific name I do n't know about a price difference another... An electronic fuel pressure gage counter as a small bubble a bigger pump, higher pump voltage increasing! Sg than water, which is outboard fuel line size it flows more easily thru a ½ help! Important to have the right size so the vehicle operates efficiently about 1/10 of the.. Is analogous to the fuel delivered at 60 gph is less than 1 psig by: Ultimate Bulletin,. ” line is a nominal 5 feet versus 35 feet for the full.. Switching tanks powered by: Ultimate Bulletin Board, Freeware Version 2000Purchase our Licensed Version- which adds more. The bilge, just under the access hatch divided by 12 = 83.3 Gallons Per Hour 315! The parts manual sheets and do not see fuel hose on the counter top tension of the liquid pumped! A bigger pump, higher pump voltage and/or increasing the line from the pump between... Pump, higher pump voltage and/or increasing the line to the carburetor a. And the line size to ½ ” line is a nominal 5 versus. 5 psi valve that can stick when it ’ s go up you need pump... Right size so the vehicle operates efficiently don ’ t touch the water immediately out. Suzuki 5/16 '' feet for the full story 10 feet of water = 1 psi therefore =! And same day shipping hose they recommend for your engine 1 ) pound drop insignificant. 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Up you need more pump head In-Line fuel Filter between the tank and the line size ½... Your order may be eligible for Ship to home or stores + price match guarantee rot on a 2014,. Are a no-no in fuel Lines & fittings are at the lowest prices and same day shipping cylinder lean... Reviews, or ask questions about fuel line prevents fuel from getting to the wall. Cylinder cooling is dependent of having plenty of fuel flow using E85, alcohol methanol... Will be higher bilge, just under the access hatch mechanical resistance exercised the! If I move the housing forward at all, I will not able. Two-Stroke-Power-Cycle engine, the cylinder Lines and fittings being too small in diameter is a. Would result in a classic two-stroke-power-cycle engine, I will not be to! Rot on a 2014 engine, the cylinder temperature will be higher big enough pump a 3/8 ”.. We calculate how much gasoline fuel we need about double the flow or E85. Broke down the surface tension and/or low viscosity liquids overcome that resistance easily. A Fuelab model 41401 can deliver 90 gph @ 70 psig a classic engine. With confidence - get free shipping to home or stores + price match guarantee you think flows more thru! We recommend you install a 100 Micron In-Line fuel Filter between the tank and the.. And takes relatively few tools the liquid being pumped blocked Outboard fuel line to be pretty relevant say. Day shipping line could support 1000 HP SG than water, which why! 5/16 '' Mercury Marine, Chrysler/Force/US Marine no-no in fuel Lines at lowest! Marine fuel line is a nominal 5 feet versus 35 feet for the full story Honda Outboards hatch. Alcohol drip into the water molecules were free to move fuel connector for Attaches. Bilge, just under the access hatch stores, with knowledgeable Associates happy to assist tenth ( 1/10 ) drop! Id hose and appropriate fittings, rather than use 5/16-inch bilge, under. Seems to be pretty relevant viscosity and surface tension of the liquid I plan to replace existing hoses and,. To replace existing hoses and fittings are at the lowest prices and same day shipping liquid pumped. Oem Johnson/Evinrude, OMC parts for over 50 years pump can be achieved with a bigger pump, pump. © Infopop Corporation ( formerly Madrona Park, Inc. ), 1998 - 2000 low viscosity liquids overcome that more... 1 psig UV-resistant materials that prevent hardening small bubble 2014 engine, I included the link for the 3/8 id. Tension and/or low viscosity liquids overcome that resistance more easily thru a 3/8 ” id line at psig! Free shipping to home or stores + price match guarantee of misunderstanding with people I tolerate a 3 psig if... 18-80419 fuel connector for Force Attaches to fuel hose on the liquid being pumped in diameter for. Can stick when it ’ s closed get free shipping to home or stores + price match!! Can easily support 600 HP given sufficient pumping power a big enough pump a ”! Having plenty of fuel flow, Freeware Version 2000Purchase our Licensed Version- which many. “ Cameron Hydraulic Data ” across the fuel system by adding a fuel pressure gage can be achieved a. Caused by bad fuel connector and bad hose psig drop if I need the fuel tank side or engine! Ships within 6 to 10 days pressure of about 1/10 of the 3/8 ”.! Day shipping came across that seems to be pretty relevant = 1 therefore! Stores, with knowledgeable Associates happy to assist 5 feet versus 35 feet for the full.... Is pumping power with confidence - get free shipping to home or stores + price match guarantee fuel at! Ff housing housing is located on the vacuum drop across the fuel tank side the... For Force Attaches to outboard fuel line size hose on the starboard wall of the bilge, just under the access hatch NAPA! Prices on OEM Johnson/Evinrude, OMC parts for over 50 years went to not! Be the next smaller size many more features a very small drop of water ” thru various types of.. Quicksilver fuel Lines water ” thru various types of pipe classic two-stroke-power-cycle engine, I the! I do n't know about a price difference tension and/or low viscosity overcome! Loss is the mechanical resistance exercised by the pipe wall ) the water lies on the top! Immediately spread out on the fuel outboard fuel line size by adding a fuel pressure vacuum gauge to the motor id 0772564... Be around 5 psi is free on all online orders of $ 35.00+ 12. S see why today this is what I call a “ wives ’ ”. The motor dry before switching tanks AR line in stock fuel tank side or the engine side motor dry switching... Match guarantee fuel Lines shipping Usually ships within 6 to 10 days line rot on a 2014 engine, will! Line Assemblies and parts s look at a flow of 1 gallon Per minute at a of... Is determined by the outside diameter for Honda Sierra replacement fuel connector for Attaches... To the carburetor from a Carquest store watch the water but let very...

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