Mercury 3.0l Power Loss

[Maxum3]

HELP!!! I am wondering if anyone can help me here.

Boat starts up with no problems and runs fine at low speeds. When trying to accelerate the boat there is sometimes a hesitation and sometimes not. Then after a short ride at high speeds the boat will begin to die out. We start the boat again and it will only run at a low speed, if we try to accelerate faster it dies out again. Had carb rebuilt and replaced fuel pump filter and in line filter. Also checked all fuel lines for blockage. thanks

 

[Dakota47]

Re: Mercury 3.0l Power Loss

next time it does it open the gas cap and see if that changes anything. maybe a clogged vent tube??

 

[Coors]

Re: Mercury 3.0l Power Loss

Do you have a fuel/water seperator? if not install one.
But you may have water/crap in the gas tank.

 

[Don S]

Re: Mercury 3.0l Power Loss

Before you start randomly replacing parts try some testing..... Like this:
http://forums.iboats.com/showthread.php?t=167561

 

[wcsparky05]

Re: Mercury 3.0l Power Loss

don s is the best!

 

[Maxum3]

Re: Mercury 3.0l Power Loss

UPDATE!!! Installed water seperator filter. Checked all hoses and including vents hoses. Still hessitates when in nuetral and in gear. Seems to happen when engine is fully warmed up. ( How long does it take before you notice a difference from the instalation of a water seperator? )
Any other suggestions or ideas.
Thank you

 

[Don S]

Re: Mercury 3.0l Power Loss

( How long does it take before you notice a difference from the instalation of a water seperator? )

You would notice it immediatly if that was the problem, but if you have water or dirt in you fuel pump, carb, tank pickup or something else, you won't notice a thing.
Did you do the fuel system test I linked to? Did you even look at it or understand what it meant?

 

[Coors]

Re: Mercury 3.0l Power Loss

you may have to go through several filters, to get it out.
change the water/fuel, and dump it in a glass jar- if water in bottom, keep changing them.
Also change carb filter.
At the end, take the top of the carb, and check the bowl.

 

[Don S]

Re: Mercury 3.0l Power Loss

At the end, take the top of the carb, and check the bowl.

Hope you realise that will require a new gasket. Not something you can really by seperatly. If you use the gasket, then determine you need a rebuild, you will need another new gasket at that point................. Or just keep chasing your tail.

 

[Coors]

Re: Mercury 3.0l Power Loss

Sorry, I keep forgetting that all my givens are there
I keep forgetting that a lot are new to engines
and if you can't re-built the engine; you have no business in the carb
poop