See full version: Fuel hose size
I vote 3/8, on the fuel line, as for the carb lines, a quick check of a part number for them should give you the answer. Going by the old lines, (unless you are the only owner, and can vouch they are orginal) is not a good method. Some people think a hose is a hose, and diameter means nothing, so they will put on what ever they find. here
I am not a mechanic, nor an expert, but if the old hose diameter worked well, then I would replace it with the same size hose. That is also assuming no performance modifications were made to the motor.
I called mercury the gentlemen i spoke with said 5/16 on the fuel lines. I have a 3/8 going from tank to motor this shouldnt cause a issue i would think? i could see where too small a line would cause starvation. Any thought?
No problem at all. Many tanks use 3/8 to accomodate many sizes of motors. You mechanic is dead on the money. Your fitings should be 5/16 and that will feed plenty of fuel to your motor. [links]
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(1) A 4-stroke motor is very different from a 2-stroke outboard motor. It is important to use the proper 4-stroke motor oil in the motor’s sump (engine) before starting the motor. A 4-stroke motor’s internal/external fuel tank only uses pure gasoline (87 to 94 octane). Do NOT put any mixture of gasoline and motor oil in the fuel tank. Do NOT use 2 stroke fuel which is a mixture of oil and gas for your new 4 stroke motor. If you have an existing portable fuel tank with 2 stroke motor fuel, please empty the portable fuel tank before using it for this new Parsun 4 stroke motor. It is best to use marine gasoline fuel or automobile gasoline that does not contain ethanol. Ethanol and water from the fuel will hurt the carburetor and fuel system. This damage is not covered by the Parsun Limited Warranty.
Prior to the following service and program, please be sure to report the issue by emailing the detailed description and photos to seller.
If the problem was found to be caused by user's mishandling and not following owner's manual to operate and maintain the motor, your motor issue will not be covered by Parsun Limited Warranty. We will let you know the estimated repair cost (parts and labor).
This is a complete fuel line assembly for a Tohatsu / Nissan 2-stroke engine between 5 and 90HP. This is available WITH 5/16 OR 3/8″ hose. MUST BE USED WITH TOHATSU FUEL TANK OR L1273 TANK FITTING
This is an EPA – CARB Compliant FUEL LINE ASSEMBLY!
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7. Safety lanyard with emergency shutoff more
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PARSUN TWO STROKE 8HP OUTBOARD ENGINES FEATURES:
14. Low emissions, quiet operation [links]
10. Start in gear protection for increased safety here