carb problem?

rangerfscott

Cadet
Joined
Mar 13, 2011
Messages
27
i have a 2002 merc 200hp 2.5l carbureted engine on a 19 ft stratos bass boat. running a 25p fury prop. for several trips now over a few months after i run to my fishing spot and fish for a little while when i start to leave the motor fires right up but when i throttle up it runs out of gas and i have to pump the primer ball again. then it runs fine to the next spot and when i leave there the same thing again. i changed the primer ball, checked for leaks with a piece of clear fuel line, double clamped all my fittings, made sure the tank vent wasn't clogged, and it doesn't have an anti syphon valve. so can i assume it is a carb problem maybe a stuck needle valve or bad float and if so is there anyway to determine which one without rebuilding all of them? all carbs were rebuilt last year and i only run non ethanol gas so if it is only one then i don't really want to tear into all of them if i don't have to. also once it is running the motor runs fine wot is at 5400rpms and boat runs 60mph loaded with all my gear and me. it does seem sluggish getting up out of the hole though. i almost have to ease onto the throttle to keep it from bogging down. i appreciate any and all input. thanks.
 

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
28,095
Re: carb problem?

Maybe the check valves in the fuel pump? Is the block getting warm enough to vapor lock the motor?
 

rangerfscott

Cadet
Joined
Mar 13, 2011
Messages
27
Re: carb problem?

i haven't pulled a vac test with the pump yet because the engine runs wot perfectly for as long as i want. it is only after i stop and then try to go again after maybe a half hour does it run out of fuel. can i test the check valves on the pump without taking it apart?
 

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
28,095
Re: carb problem?

Sure, pull the fuel line off the motor and see if the carb gas leaks out, thru the fuel pump. The quick disconnects seal, so you cannot have one of those on the engine.
 
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