Gas flow problem (outboard)

[backcast]

Ok, I think I've finally figured out what's going on.
My Yamaha 60c runs fine, but while on plane over 3500-4000 rpms, it starts to starve for fuel and I have to squeeze the bulb to help it out. I've run new lines, bulb, fittings, etc. ruling out an air leak.
I only started having this issue after I installed a water separator. I currently use the recommended 10 micron whatever filter. This seems to be where I'm having the issue. Is it possible that it's not letting fuel pass quickly enough? Can I use a more porous filter? I never had this problem when I ran it without a water separator.

[tailfisher17t]

Is it a F60, T60 or a 2 stroke 60?

[backcast]

Is it a F60, T60 or a 2 stroke 60?

2 Stroke. C60.
And if I had to repower this boat, I'd put exactly the same back on.

[tailfisher17t]

SNAP!!!

Just as I was going to say "repower"

Get a small Electric fuel pump for it; it will keep the Pressure good.

I was having issues and only able to run 34mph and it seemed as if it needed more fuel at 5700 rpm. ....... Problem solved and running 38 all day.

[tailfisher17t]

PS - I have not even looked at my priming ball for YEARS!

[maclavin]

Take the anti syphon valve out of the tank.



Mike

[fishnbilly]

When we have this problem with any outboards we hook up a vacuum gauge with clear PVC line and see where the air is occurring at and what the vacuum is at each spot.

Also try running the motor off a 6 gallon tank direct to the inlet connector on the engine. Problem goes away then it is your fuel delivery system and not the engine. If you still have the problem bypass the fuel inlet and go right to the outlet on the other side of the Yamahas on board "rock catcher." If you still have the problem throw a new fuel pump on ESPECIALLY if you say the problem goes away while squeezing the primer bulb.

The check valves in the fuel pump could be weak and not seating or the fuel pump diaphrams are weak. You don't say how old the motor is?? Where are you located at as we are authorized to work on Yamahas and Mercury outboards.

Hope this helps

[backcast]

Motor is a 2001.

[backcast]

Update. Ran it directly from a portable tank and it ran like a top. This rules out the problem being in my motor.
So....I'm thinking the fuel/water separator is the issue. It seems as if it's not letting enough fuel flow through to supply the motor. According to what I've heard, I'm using a 10micron filter to battle the nasties of ethanol.

What do you guys think now??

[Steve.r]

Update. Ran it directly from a portable tank and it ran like a top. This rules out the problem being in my motor.
So....I'm thinking the fuel/water separator is the issue. It seems as if it's not letting enough fuel flow through to supply the motor. According to what I've heard, I'm using a 10micron filter to battle the nasties of ethanol.

What do you guys think now??

Can the filter and run 93 then pull the gas line and run it dry when you flush it , works good on my 70 johnson ,never gives me a problem.

[maclavin]

Take the anti syphon valve out of the tank.



Mike

If you have a tank built into the boat take out the anti syphon valve. If not test it with the 6 gallon tank and the h2o separator hooked up. What color is your fuel line.

[backcast]

Can the filter and run 93 then pull the gas line and run it dry when you flush it , works good on my 70 johnson ,never gives me a problem.

I didn't have any problems before the separator. I always run 93 with seafoam.

[backcast]

If you have a tank built into the boat take out the anti syphon valve. If not test it with the 6 gallon tank and the h2o separator hooked up. What color is your fuel line.

Fuel line's black. I think it's Napa 3/8. It's a 17gal translucent tank under the front deck. I can remove it if needed. I gotta look up and figure out what the anti syphon valve is.

[Steve.r]

I didn't have any problems before the separator. I always run 93 with seafoam.

BC why did you decide to go with the filter.

[backcast]

BC why did you decide to go with the filter.

Was told it would help with the ethanol nasties. When I replaced my fuel line I cleaned my tank and had what looked like varnish in the bottom of the tank. Can't afford a new motor so took whatever precautions I could afford.

[Steve.r]

Was told it would help with the ethanol nasties. When I replaced my fuel line I cleaned my tank and had what looked like varnish in the bottom of the tank. Can't afford a new motor so took whatever precautions I could afford.

As much as you seem to like to fish and take your boat out you wouldn't have an issue with bad gas , now that being said if you had varnished gas in your tank I wouldn't think that a filter would solve this problem if it a water fuel seperater bad gas is bad gas.

[backcast]

As much as you seem to like to fish and take your boat out you wouldn't have an issue with bad gas , now that being said if you had varnished gas in your tank I wouldn't think that a filter would solve this problem if it a water fuel seperater bad gas is bad gas.

Yeah, I know, when I'm tournament fishing and when I was guiding, I was running the boat at least 5 days a week. Not so much now, but I rarely use more than 5-6 gallons in a trip so I'm sure there's some old gas in there all the time. Come duck season, it gets covered.

[maclavin]

Fuel line's black. I think it's Napa 3/8. It's a 17gal translucent tank under the front deck. I can remove it if needed. I gotta look up and figure out what the anti syphon valve is.

Anti syphon valve is built into the fuel line barb coming out of the tank. Replace it with a new one made by OMC or install a plain barb in its place.


Mike

[backcast]

Anti syphon valve is built into the fuel line barb coming out of the tank. Replace it with a new one made by OMC or install a plain barb in its place.


Mike

Ok. It's that thing that comes off the tank and goes into a 90*? Mine looks like a brass block with a barb at the end. If I go without, do I still need to make the 90*?

[fishnbilly]

The anti-siphon valve will have a shiny round ball in the OUTLET side of it. You should be able to "suck" in the direction the fuel flows but not if you sucked in the opposite direction.

They are one of the most troublesome of the "cures' that the Coast Guard implemented long ago but they have stopped a few fires that would have been feed an endlass supply of gas if not there. Your situation I would take it out or use a punch and drive it out.

Replace the primer bulb with a good OEM bulb also as it has a check ball inside it that is prone to coming loose and blocking the fuel flow especially if the primer bulb is left hanging down in the direction of the arrow on it and it is old. Cheap insurance....

Hope you get going

[maclavin]

No. Take out every 90 in the system you can. Each one is about a 1\2" of vacuum. The brass block is the fuel pickup and the barb should unscrew from it.


Mike

[Sea Larry]

Was told it would help with the ethanol nasties. When I replaced my fuel line I cleaned my tank and had what looked like varnish in the bottom of the tank. Can't afford a new motor so took whatever precautions I could afford.

Did you fill the filter with fuel before installing?