Mercruiser 470 Leaking Carburator

[a1nowell]

My boat has been garaged for over a year. I put a couple of ounces of Marvel Mystery Oil in each cylinder last week(4/15) and took it out to the lake this morning. I pulled the coil wire and cranked it 4-5 times. I put the coil wire back on gave her a shot of either and she fired right up. I took her on about a 15 minute spin and at the dock at idle I noticed the carb leaking. I pulled the spark arrestor off and saw gas flowing into the carb from the tube that goes to the fuel pump. (I think that's where it goes) Can anyone give me a clue as to what my next set is? Engine ran fine on the lake and idled fine at the dock. (And yes I ran the entire time with the engine compartment open.)

Thanks,

 

[Bondo]

I pulled the spark arrestor off and saw gas flowing into the carb from the tube that goes to the fuel pump. (I think that's where it goes) Can anyone give me a clue as to what my next set is?

Ayuh,.... Sounds like the diaphragm in the fuel pump has a hole in it,.....

Change the fuel pump is the cure,.....

 

[a1nowell]

Thanks Bondo.

The fuel pump on my tritoon is a real Bi..H to get to because the engine is setting down in the back end of the center toon. Has anyone put an electric fuel pump on a 470? If I recall pump only needs to produce 4-7 pounds of pressure.

 

[Bondo]

Ayuh,.... By the time ya replumb in an electric pump, 'n wire it, safely, with a oil pressure switch,....

You can do the headstand, or whatever it takes, 'n slap on a new mechanical pump, you can get right here at iboats,.....

 

[SDSeville]

An electric fuel pump is not a bad idea, but don't do it to try to save work. Even after you replumb and add the oil pressure switch, you still need to remove the old fuel pump and cap it off, which is the same amount of work as replacing it with another mechanical one. More work...