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fuel problem maybe

C

cape breton

New member
please help purchased 454xl with 5 hours use on it. put it in and notice fuel pump wire disconected at the alternater. hooked it up boat runs perfect as far as half way through the four barrels. last half of four barrels it cuts in and out. is it possible original fuel pump not giving enough fuel. let me know what you think thankyou cape breton ps motor is late 90;s all filters are clean
 
all filters are good all lines are good tank is good. only thought is the eletric fuel pump was disconected so they must of had a different pump system. has anyone ever had problems with the original eletric fuel pumps thanks for the reply jeff
 
Here's an idea: Seeing it has an electric fuel pump, stick a pressure gage in the line at the carb and see what pressure it generates. Should be 4 to 7 psi.

Jeff
 
If your description meant the engine runs fine until the upper rpm range, then yes, concur with a fuel starvation problem.

electric pumps, especial the early generations weren't known as being reliable. Timeframe makes it a Gen V or early Gen VI so a mechanical pump isn't viable. if the filters are clean, see if an anti-syphon valve is used. if so, check it for restriction.

The pump has two key requirements: pressure in the range suitable for the carb and sufficient volume to keep the bowl filled at max RPM. having one without the other will result in a starving condition.

Bad electrical connections and contacts will inhibit proper electric pump operation; may be woth investigating , too.
 
I believe I would check all the filters first, before I jumped to the fuel pump. Sounds more like you have some water or gunk in the bottom of the canisters and when you try to go to wot it sucks some in, also if you do find some gunk in the filters I would check the fuel bowls in the carbs, there could be some junk laying in there that gets sucked in when you demand it all. good luck...Lee
 
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thanks for the replys this problem happens at the last 3/4 of trottle never had time to work at it today. going to town to get a few things at the auto parts [3 hours away] i live in the country. i will up date after i try a few things weather is a factor now it is not every day that i can go out to sea and try it.thankyou for everything i appreciate the help thankyou cape breton p.s great site
 
No relation to the issue other than during hurricane Irene we had a generator available that just would not start or run .... being desperate, we applied the 100% effort to diagnose the problem and sure enough, the main jet was solidly plugged. Started perfectly and ran for days after sitting 12 years
 
good morning my fellow crusaders work on motor yesterday didn't find any fuel problems my next step is to check timing please give me a hand 454xl late 90;s i assume there is a wire you have to unplug to set your base timing where is it and what color this motor has the coil seperate from the distribitor and eletronic box is over by exhast also what should her setting be thanks guys keep up the good work cape breton
 
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