90 HP Yamaha - Ethanol Woes
 

What do I need to do? 4-stroke Late Model

Raycor Filter plus the factory filters were all muddled up. Fuel line is getting soft. My buddy may have put off the replacement of the fuel lines too long. Now it won't turn full RPM and the idle has gone south. If it was a Merc I would be pulling the injectors and sending them off.
What do I need to do first? Besides replacing all the fuel lines and filters?

Well, no replies must mean it ain't a common enough issue. Got the manual. Looks like the fuel delivery is similar to the Merc. Vapor cannister, multiple filters. I will dive in today.

Update- Confirmation on the bad fuel. Phase seperation. New filters (3) plugs (old plugs looked great), complete service, drained the fuel tank and in fact are replacing it entirely along with new fuel hose and primer ball. Burned the skimmins in the Snapper rider.
The VST on this Yamaha is buried behind the intake. Noone had the gasket or the filter for the VST. I suspect the injectors are full of crud but it may survive without taking it all apart. I mean that is a lot of filters. New tank, fresh fuel, ring free and stabilizer then a fuel pressure test.

"Burned the skimmins in the Snapper rider. "



I was read this like three times ,saying to myself..."what the F is a skimmins"....then I got it.

Treat your engine to some SeaFoam. It will help. :beer:

Wilson, might should have said squeezins. LOL Boat & motor belong to a good friend. Trying to sort it out in time for the crappie bite. Seafoam is good stuff.:beer:

I've got two chainsaws and a blower down due to ethanol fuel. I run stabilizer, 89 or 93 octane in everything, and RUN everything regularly. I'm seriously thinking about buying gas from a bulk suppiler that is ethanol free.

I hear that Bradford, there are a few places in central Florida to buy the non-ethanol fuel. It is more $$$ and a bit of a PITA but worth it I guess. So far I have been OK using additives and using the boats often. If you let your equipment sit for long in between uses the non-ethanol might be the way to go. Problem for me now, I can't remember if I put the additive in the V last time or not. :head: Five weeks since last use. How long does the fuel stay fresh?

Unfortunately, "squeezins" are here to stay and we might as well get used to it ...and prepared for it for the long haul...I can't say why, but so far I haven't had any fuel system failures...but it could certainly happen tomorrow...replace all filters, lines, etc to ethanol compatible and get back out there to work on my baby...I can't wait to see what her next life is gonna be like!!...LOL!!...:sun:

if thats a 90 EFI Yamaha 4 stroke, then pull the intake off, its not as hard as you think, the bottom bolt is tricky. Take the throttle bodies with it. leave the VST attached to the intake. Once you have the manifold/VST assembly on the table, you can pull the screws out of the top of the vst and drop the resevoir off the bottom. Clean out the resevoir, replace the screen on the fuel pump. Take the injectors out, send them off to have them cleaned(I use injector rx), when you put it all back together, fush the mechanical fuel pump with carb cleaner, then gas. Replace the inline filter between the mechanical pump and the VST. Put it all back together, repalce the fuel line with new, install a water sep filter if you don't allready have one. I've done about 10 of these this year. I've tried every short cut, but its easier int he long run to pull it all apart and do it all at one time