allisonfrnyork33
09.05.2021 20:24:33
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So I was out thinking of replacing my fuel lines all the way to the motor. The replacement bulb and line has quick connect fittings on both ends. On the motor, the existing one appears to be one single line from the bulb into the filter. The breakout view of the motor looks like it has a connector fitting at the point the line enters the motor. Is that hiddin by the "grommet" where the cables, etc pass thru?
Also,
Are these 3/8" lines and is it important to keep the same size diameter lines?
My 03 F90 had one solid line through the grommet to the filter. I removed the grommet cap and pulled it up and out and it opens like a clamshell making it easy to remove and run the new line and then put it all back together when you get it where you want it.I would definately use the same size hose and the inside diameter is the important size. I purchased my hoses from a Yamaha dealer the engine hose was a Yamaha product and thinner walled hose than the rest(I guess to fit the hole in the grommet) I used a thicker walled hose from the bulb to water seperator, and to the tank. I believe mine was 5/16" inside.I also added some plastic tie wraps around the grommet when done to hold it closed on the front of the motor, as it was trying to open up from age on the rubber.I was having ethanol issues and uncertain about the 03 hoses when I replaced them, But as Robert Graham said my factory engine hose appeared to be in good condition on the inside once I removed it. the other hoses had signs of deterioration. here
Re: Yamaha F115 Fuel Lines
The air still come back into the system particularly at low speed.
I am going to add a fuel pump by the tank unless some one has a better idea. [links]
I was just trying to rule out all possibilities and yield to those with more experience I have already bought a pump and will try it next weekend. more
my suggestion?
find and fix the problem.
a simple vacuum guage will help.
if the pump is known good aand by pumping the primer bulb keeps it running I would look for an airleak.
at every joint place a few drops of two stroke motor oil.
see if it gets drawn into the system.
if it does you will see it dissapear and discolor the fuel. [links]
You can check fuel pump pressure and vacuum with the proper gauges and you can install a clear piece of tubing for testing to see if air is being sucked in, more
It's not #1 or #2 that's causing air to be pulled into the fuel system. Only left with one probability. Do the vacuum test as rodbolt suggested, or pressurize the fuel line as townsend suggested.
An outboard fuel line made of alcohol resistant material with a complete length of 2.1m. The rubber primer bulb and hose allow for greater fuel flow for maximize performance.
Suitable for Yamaha & Mariner outboards:
– Yamaha 5HP – 115HP
– Mariner – 5HP – 55HP
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