Yamaha F115 Fuel Lines

[tomn3]

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?

Thanks

[robert graham]

Are you having a problem with your old fuel lines? My motor is a 1999 Yamaha with all original fuel lines, no problems, no cracking, no deterioration. If you're dead set on replacing them, be sure and use the original equipment Yamaha Marine fuel lines, Not automotive fuel lines. Good Luck!

[mommicked]

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.

[tomn3]

Thanks to both,
I'm fighting a performance issue and had the fuel tank cleaned. It's an '05 with the original lines. May have had ethanol from the previous owner. I figure it's a relativly inexpensive swap out. I had bought an aftermarket Marpac bulb/line assembly but it didn't look right. I'll go the OEM route for a few more bucks.