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