[crussell85]

i was thinking more about this last night and my thought is that the fuel pump that I chose isn't big enough to supply the fuel demand of a boat that is running higher rpms constantly at times, there is no shift points or rpm drops so maybe I am burning more than the pump can pump

[crussell85]

ok, I went and talked to someone about my issue and they had suggested that I just bought a faulty pump. So I went back home and figured I would time it, that a 30 gph pump should do about 1/2 a gallon a minute. I went to time it and in like 2 minutes I had maybe a 1/4 gallon if that. So the I unhooked from the tank and figured I would try it pumping from the jug. It was night and day difference. The drop tube in the tank was nasty and corroded and I couldn't draw any fuel from it. Don't worry the mechanical pump is still out because when I was trying to make the mechanical pump work I was trying to pump from an outboard tank. Everything is set up and working good. Boat will run about 40mph.

[Torque454]

Sounds like youve got it fixed or atleast improved but wouldnt a lean condition indicate a vacuum leak or improper jetting in the carburetor? As long as there is fuel in the carb, the fuel mixture should be correct, again, as long as the jetting is right and there are no vacuum leaks. Once the float bowl is dry it would be too lean to run, and not just lean enough to burn up a piston.


Make sense? You wouldnt want to roast another piston.

[Jsup]

what happened a couple years ago Boat US (insurance company) put out a warning that mixing auto gas from the pump and marine gas from the marina will cause a reaction where the gas will turn to jelly clogging the system.

It has to do with additives in the gas reacting.

Just FYI....

[Jsup]

Originally Posted by Torque454

Sounds like youve got it fixed or atleast improved but wouldnt a lean condition indicate a vacuum leak or improper jetting in the carburetor? As long as there is fuel in the carb, the fuel mixture should be correct, again, as long as the jetting is right and there are no vacuum leaks. Once the float bowl is dry it would be too lean to run, and not just lean enough to burn up a piston.


Make sense? You wouldnt want to roast another piston.

Could be a sticky float. Happens a lot with boats because people store them.

What was improved here was the fuel delivery, we don't know if it solved the problem.

Because boats are stored for months in many cases, they are prone to fuel problems.

[weedy64]

A bottle of Seafoam (fuel additive/varnish remover) in your fuel should cleanup the carb. A good filter just before the carb would be a good idea because it will clean out crap in the tank/lines etc as well and it only had one place to go.

[37jim]

I wonder did you check that something hasn't fallen into the fuel tank and is interfering with the pickup tube? A guy I know had someone put a peice of plastic in his tank and he would loose fuel pressure all the time .Took forever to figure out .