Ok, so I have a question. I have a 96 502, that was a MPI, but I have convereted it to a carb motor. I have used the factory sea pump/fuel pump feed gas to the carb. Cause on these motors, they used the sea/fuel pump to feed the vst pumps. I have has this set up for 3 seasons now with no real issues. What should I do to check for fuel in the oil, or is this fuel/sea pump not the ones you are talking about..

2 bolts on top takes off the fuel pump part then make sure it's full of oil

What fair priced electric pumps do you recommend? That
Pull and push fuel?? Bc holly red didn't prime or stay primed..

Manley marine makes a 140GPH pump that can lift up to 16", model #4142 and its USCG certified.

Heres a question maybe some one can answer for me.....I have one each of the sea-water pumps i'm rebuilding. One of the old style (less fuel pump) and one of the newer style (with fuel pump). The old style had greese packed bearings...the new ones i'm guessing are an oil bath. (I assume this as i have yet to take it apart)
question i have is would it be worth while to convert the old style to an oil bath type setup instead?? Easy enoguh to drill and tap a set of screw holes with some small allen head set screws to fill/drain it.

That's a mega-understatement. Having to service your $$ engines every month is stupid beyond belief. Why didn't they just throw a small electric lift pump inline???

Sounds like a great application for an aftermarket manufacturer...

How do you get the upper diaphragm off the pump arm? i bought 12-454-11 and replacing the bottom half is not a problem. The upper diaphragm is what leaks. thanks

Look like you. Have to remove that pin from side somehow,,iam trying to rebuild mine too,and an asking the same question

only way to get it out is to drill a hole the size of the pin .but you better be right on the money .1 hole on each side knock the pin thru with a small punch . if you bought a new diaphram kit witch they sell it will come with new plugs you tap in .i took mine completly apart and had them coated to reasemble i tapped the holes and installed stainless set screws now they are completely rebuildable

Did a lot of research and found a few interesting things. Holley does make replacement diaphragms that will work with our type of fuel pump. The problem is getting to arm out to replace it. I have attached a picture of one of mine that I drilled to get the pin out, smoking gun is right you have to be perfect..I missed by a 1/16 as you can see in the photo. I do have 2 other bodies to use after I make a template. The other interesting part is there is a seal on top of the shaft that should seal any gas from getting in the fresh water pump housing. Mine was torn so when the diaphragm leaked there we no seal. Holley also make a pump that is rebuildable but it’s more than the merc. If we could just buy the upper housing we could change the merc arm and be good to go.