fuel pump bad?

[mrpike1973]

15 hp evinrude 1978. just started doing this starts up great let it warm up about 1- 2 minutes then when i crack the throttle in forward it dies. starts right back up. if i feather the throttle it hiccups a little then i can get going wot. no problems wide open seems intermittent. has new fuel line and bulb. carb rebuilt 1 year ago the vent is open on tank. i have tried to prime the bulb when it dies but it happened so fast i cant get to it. use non oxy gas the line and bulb are newer but didnt have a problem for a month with it could it be a pump?

[boatfixer]

Typically the fuel pump will stop pumping and the only way to restart is to pump up the bulb again.

[mrpike1973]

thanks boat fixer what would you suggest i try?

[Rick G]

Sounds like a little gunk in the carb. I would try the seafoam treatment first.

[Surface Tension]

Are you having to pump up the bulb to restart?

It matters.

If not then I'd inspect or replace the spark plugs.

Check the coil wires looking for wear from rubbing.

Clean carb.

[mrpike1973]

not having to pump the bulb again. plugs look good but replaced with spares same thing. hesitant about seafoam isnt that just a mechanic in a can and masking the real problem coil wires look good no chafing etc

[TruthWalleyes]

Seafoam will help remove any buildup in the carbs.

[Washing Lures]

The other thing to check is the screen inside of the fuel pump. My motor had the same issues this spring. If you take out the center screw in the fuel pump there is a screen behind the cover. I cleaned my out with carb clean and the motor ran like a top.

Good Luck

[mrpike1973]

putting sea foam in now i'll give it a shot

[TruthWalleyes]

putting sea foam in now i'll give it a shot

Make sure you do it by the label!! Don't add more than what the can says.

[jrazz]

Truth, do you know from experience? Ha!

[Surface Tension]

If the bulb is hard then the fuel pump is working.

Even though you can run at WOT that doesn't mean you don't have a lean condition and the bogging and hiccup(lean sneeze)is a symptom of lean. Its just a matter of where.

Could be dirty carb. You said it was cleaned a year ago but that might not have been thorough. Could be sucking air from a loose carb. Wouldn't hurt to check and if found tight remove it and clean it. A bad seal will suck air and cause a lean condition.

Seafoam is more a decarb product and fuel stabilizer. It does have some cleaning qualities but not much and nothing near a good cleaning.

If you want to try it mix 1 bottle of seafoam to 1 gallon of mixed gas.

Run all at idle and a then vary the RPMs. Turn off the engine for periods if you want but just use it all up.

[mrpike1973]

if i take the carb off is that gasket hard to buy or put on how do you clean a carb? if i have to take it apart i never get the set screws in right so i probably would end up bringing it in thanks for the help.

[TruthWalleyes]

Truth, do you know from experience? Ha!

Yep. $1,000 Mistake.

[Surface Tension]

You can reuse the gasket. Probably best to bring it in if the shock treatment doesn't work.