engine bogging and poping truh carb ..

[inchman]

hi all, ive a 1988 bayliner trophy with a mercruiser 3.0 engine, the engine starts great and idles fine, but once i pass 3000 rpm ( aprox ) the engine hesitates and looses power and some times pops thru the top of the carb, has anybody any suggestions of what trouble shooting steps i should take ??

cheers Gary

 

[Bondo]

Re: engine bogging and poping truh carb ..

Ayuh,... It's staving for Fuel...
Change the fuel Filters 1st,+ if that don't do it, find the restriction...

 

[180shabah]

Re: engine bogging and poping truh carb ..

+1 - find the fuel issue.

It's a 3.0, so probably no water seperator - you NEED one.

 

[DJ]

Re: engine bogging and poping truh carb ..

Possibly the anti siphon check valve at the fuel tank outlet. The valve is the tank outlet. It's ok to remove it FOR TESTING ONLY.

 

[RickJ6956]

Re: engine bogging and poping truh carb ..

Other possibilities include ignition timing and worn-out points.

 

[6meter]

Re: engine bogging and poping truh carb ..

Or coil, again.

 

[inchman]

Re: engine bogging and poping truh carb ..

hi, i did a few checks today, and im only getting 2.75 psi fuel delivered to the carb, when i spray a petrol, into the carb is seems to eliminate the problem, think is a fuel pump the answer to my problem.

cheers Gary

 

[Bondo]

Re: engine bogging and poping truh carb ..

think is a fuel pump the answer to my problem.

Ayuh,... Possibly, but the fuelpump can't push what it can't suck,...
Try a Test Tank like DJ said....

 

[180shabah]

Re: engine bogging and poping truh carb ..

hi, i did a few checks today, and im only getting 2.75 psi fuel delivered to the carb, when i spray a petrol, into the carb is seems to eliminate the problem, think is a fuel pump the answer to my problem.

cheers Gary

Why jump straight to the most expensive part and hope?

Filter?
AS valve?
Vent line clear?
Filter/s?
Collapsed fuel line(not likely but...)