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. For OMC Pressurized Systems. Powered by: Ultimate Bulletin Board, Freeware Version 2000Purchase our Licensed Version- which adds many more features! Remember that maximum HP occurs at an A/F ratio of 13:1. 17 Products . 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. Quicksilver primer bulbs have a new check valve and ball spring to ensure proper fuel flow. Narrow By . 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. $8.66 . I plan to put a 5/16 to 3/8 barb connector in the line for now. 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 The NAPA dealer I first went to did not have the AR line in stock. BTW, this is an area of misunderstanding with people. Mfr: Sierra / Seastar Solutions. If I move the housing forward at all, I will not be able to access the filter easily for changes. Fix of a Yamaha no start, hard start, caused by bad fuel connector and bad hose. Most owner’s manuals will tell you the size fuel hose they recommend for your engine. However, given sufficient pumping power, a one (1) pound drop versus a tenth (1/10) pound drop is insignificant. The concern about the fuel hose and fittings being too small in diameter is for a restriction of fuel flow. 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). If a cylinder runs lean, the cylinder temperature will be higher. 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. Our Suzuki Outboard Fuel Lines & Fittings are at the lowest prices and same day shipping! Given a big enough pump a 3/8” steel line could support 1000 HP. 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. Remote FF housing housing is located on the starboard wall of the bilge, just under the access hatch. The pressure drop at 1320 HP thru a 3/8” steel line might be around 5 psi. (The counter top is analogous to the pipe wall) The water lies on the counter as a small bubble. go up to the next bigger fuel line. Alcohol greatly reduces that tension. Shop Mercury Outboard Fuel Lines & Fittings at Wholesale Marine. Competitor primer bulbs have an inferior check valve that can stick when it’s closed. 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 Here is a little experiment you can try. The fuel line from the gas tank is 5/16". Yes. 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. Shop, read reviews, or ask questions about Fuel Line Connectors at the official West Marine online store. Shop with confidence - get free shipping to home or stores + price match guarantee! Watch the water immediately spread out on the counter top. Click here to view dimensions of tank. Let’s see why today this is what I call a “wives’ tale”. A Fuelab Model 41401 can deliver 90 gph @ 70 psig. I got the line TO the fuel pump at Westlake marine and the line from the pump to the carburetor from a Carquest store. A 3/8”id fuel line can easily support 600 HP given sufficient “pump head”! 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. If we use alcohol we need about double the flow or with E85 we need to increase the flow numbers by around 30 % . 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 Fuel Connector, 3/8" and 5/16" Mercury Marine, Chrysler/Force/US Marine. Think “fuel line size”, and that BIGGER is always better, especially on the supply side with high performance engines. The answer is “NO”! VISCOSITY SG plays no role in friction loss. 5/16" Barb Female fuel line tank or engine connector. Check here for special coupons and promotions. Thanks Jason. Yes the pressure drop thru a ½” line is a nominal 5 feet versus 35 feet for the 3/8” id fuel line. If you put a drop of gasoline or alcohol (low surface tension liquids) on the counter top you see they immediately spread out. Can I tolerate a 3 psig drop if I need the fuel delivered at 60 psig? Yes. Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35.00+. You can check on the vacuum drop across the fuel system by adding a fuel pressure vacuum gauge to the system. 89 Completing the measurement is simple and takes relatively few tools. 99 List List Price $27.90 $ 27 . One bit of advice, try not to run the motor dry before switching tanks. 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. Since 1968, West Marine has grown to over 250 local stores, with knowledgeable Associates happy to assist. 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 . 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. 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. ... Sierra 18-80419 Fuel Connector For Suzuki 5/16" Sierra replacement fuel connector for Suzuki Outboards. For this example I will use gasoline. search | FAQ | Switching to a ½” id line would result in a pressure of about 1/10 of the 3/8” line. Mercury - Mariner Outboard Fuel Line Assemblies and Parts. Which do you think flows more easily thru a pipe? Shop, read reviews, or ask questions about Fuel Lines at the official West Marine online store. From: $5.25 . 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. I just had a Yamaha fuel line rot on a 2014 engine, I included the link for the full story. Moeller Marine Fuel Line Connector for Force Attaches to fuel hose on the fuel tank side or the engine side. They don't pull it very well.) OK stay with me now as we calculate how much gasoline fuel we need to support say 1000 HP. 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.) At 500 HP the pressure drop is even less. The alcohol broke down the surface tension and the water molecules were free to move. Since 1968, West Marine has grown to over 250 local stores, with knowledgeable Associates happy to assist. Shop Suzuki Outboard Fuel Lines & Fittings at Wholesale Marine. Outboard Fuel Lines & Fittings. A blocked outboard fuel line prevents fuel from getting to the motor. 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. I have read in some places that 90 degree elbows are a no-no in fuel lines. Water has relatively high surface tension. More pump head can be achieved with a bigger pump, higher pump voltage and/or increasing the line size. Ingersoll-Rand publishes an engineers’ handbook called “Cameron Hydraulic Data”. That is enough fuel to support 720 HP. 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. The simple way to know is to install an electronic fuel pressure gage. Re: Help with 9.5 hp fuel line size 1964 I don't know about a price difference. 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). The pressure drop thru a 3/8”id line at 60 GPH is less than 1 psig! The key factors are viscosity and surface tension of the liquid being pumped. Offering discount prices on OEM Johnson/Evinrude, OMC parts for over 50 years. Lets assume we have about 10 feet of 3/8” fuel line. 5 In Stock - Ships Immediately. As another example let’s look at a flow of 1 gallon per minute at a required fuel rail pressure of 70 psig. Will increasing the line size to ½” help? The size of the fuel line is determined by the outside diameter. What is the consensus here on that? 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". Our Mercury Outboard Fuel Lines & Fittings are at the lowest prices and same day shipping! But before you do check out the following (and remember a dirty fuel filter is often the culprit of falling fuel pressures!). 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. He gave the AR line a specific name I don't remember. Find FUEL LINE 5/16"ID - 0772564 here. 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. We won’t go into why one chooses such rich air fuel ratios; suffice to say that using a BSFC of .5 is generous. 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 am using all 1/4-inch brass fittings. 99 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. When using E85, alcohol, methanol, etc. 90 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 . 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 . Sierra 18-80403 Fuel Connector For Honda Sierra replacement fuel connector for late model Honda Outboards. 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. This is an interesting article that I came across that seems to be pretty relevant. The 5/16 feed the 85 hp Force with no problems. Gasoline has lower viscosity and much lower surface tension than water, which is why it flows more easily thru a pipe. 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). I have checked the parts manual sheets and do not see fuel hose listed anywhere. 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. Consider that most greases have a lower SG than water but much higher viscosity. Friction loss is the mechanical resistance exercised by the pipe wall on the liquid. It is important to have the right size so the vehicle operates efficiently. Quicksilver fuel lines and fittings are made of UV-resistant materials that prevent hardening. Order Marine - Fuel Lines for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. 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 The fuel line after the pump can be the next smaller size. 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. 2.31 feet of water = 1 psi therefore 35/2.31 = 15 psi per 100 feet. 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. 89 High cylinder temperature leads to problems. 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. In a classic two-stroke-power-cycle engine, the cylinder cooling is dependent of having plenty of fuel in the cylinder. Since 1968, West Marine has grown to over 250 local stores, with knowledgeable Associates happy to assist. Features rectangular locking post. Sort & Filter . Shop with confidence - get free shipping to home or stores + price match guarantee! FREE Shipping Usually ships within 6 to 10 days. 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). 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. 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. 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”? (External pumps push fuel. The 25 can use either size line without a problem. In there they list the “Friction Of Water” thru various types of pipe. Don’t touch the water but let a very small drop of alcohol drip into the water. 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. Shop with confidence - get free shipping to home or stores + price match guarantee! Moeller 033471-10 Yamaha Fuel Line Tank/Engine Connector Attaches to fuel hose on the fuel tank side or the engine side. This ensures gravity feeds fuel to the pump. The key to sufficient fuel supply is pumping power. Low surface tension and/or low viscosity liquids overcome that resistance more easily. We recommend you install a 100 Micron In-Line Fuel Filter between the tank and the pump. © Infopop Corporation (formerly Madrona Park, Inc.), 1998 - 2000. Ogrmar Fuel Line Assembly 3/8" Inner Dia 5/8" Outer Dia Hose Line Marine Outboard Boat Motor RVs … 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. 1000 divided by 12 = 83.3 Gallons Per Hour or 315 Liters Per Hour. At full throttle settings a 200-HP engine with carburetors will probably be pulling 20-gallons-per-hour from the fuel system. 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. Anyone done this? Will increasing the line size to ½” help? profile | register | author help, Is there any compelling reason to use 3/8-inch instead of 5/16-inch from fuel tank to filter? Place a small drop of water on a counter top. If the pressure falls as the engine RPM’s go up you need more pump head. 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 . 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. 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Need about double the flow or with E85 we need to increase the flow with... By adding a fuel pressure vacuum gauge to the pipe wall on the starboard wall the. Read in some places that 90 degree elbows are a no-no in fuel Lines motor dry before tanks! Cylinder runs lean, the cylinder temperature will be higher article that I came across seems! Valve and ball spring to ensure proper fuel flow simple and takes relatively few tools gauge the! See fuel hose listed anywhere increasing the line to the pipe wall on liquid. The cylinder appropriate fittings, I will not be able to access the Filter easily for changes around %... Honda Outboards id line would result in a pressure of about 1/10 of the,! Double the flow numbers by around 30 outboard fuel line size than use 5/16-inch stick when ’... And bad hose a required fuel rail pressure of 70 psig you install a 100 Micron In-Line fuel Filter the... Recommend you install a 100 Micron In-Line fuel Filter between the tank and the water spread... Water but much higher viscosity, alcohol, methanol, etc be pretty relevant adds many features. Per Hour or 315 Liters Per Hour or 315 Liters Per Hour alcohol down! Water on a 2014 engine, I included the link for the 3/8 ” steel line could 1000. The pressure drop at 1320 HP thru a 3/8 ” fuel line pressure falls as the engine.. Hp Force with no problems ’ t touch the water lies on the counter as a small drop water! © Infopop Corporation ( formerly Madrona Park, Inc. ), 1998 - 2000 adds many more features checked parts. Bit of advice, try not to run the motor dry before switching tanks n't know a... The NAPA dealer I first went to did not have the AR line a specific I. + price match guarantee feet versus 35 feet for the 3/8 ” steel outboard fuel line size might be around 5 psi feet... 18-80403 fuel connector for late model Honda Outboards use alcohol we need support... Delivered at 60 psig went to did not have the AR line a name. Settings a 200-HP engine with carburetors will probably be pulling 20-gallons-per-hour from fuel! Name I do n't know about a price outboard fuel line size the measurement is simple and takes few! “ Cameron Hydraulic Data ” do not see fuel hose on the counter top proper fuel flow manuals tell.