Re: replacing fuel pump
Repeat after me: I will never listen to chiefalen.
if your pump has an upper and lower half held together by 6 or 8 screws then you can easily undo it. The problem is finding a new diaphragm, the parts industry is such that they want you to turn in the whole part to make profit. They rebuild it using a $2 diaphragm while you have to buy a whole new or rebuilt unit at full price. Parts like that, including starter solenoids an alternator parts, are hard for consumers to come by. You might be able to find it from summit, jegs, or holley.
the only thing marine about a mechanical fuel pump is if there's a vent on the fuel pump body then there is some provision to contain gas when the diaphragm gets a hole in it otherwise gas would leak out of the fuel pump and into the bilge. When the the pump body isn't sealed, then there has to be some way to contain gas that may come out when the diaphragm gets a hole in it. Usually it's a nipple that mercruiser will run that stupid yellow hose off of, the old way was either a pipe plug sealing it or a sight glass which has a little sign in it saying "if you see gas in here, replace fuel pump".
If you buy a standard inexpensive fuel pump from the parts store, they usually have a pinhole vent in the body which would be bad if used on a boat.
