Haven't had any problems but when I do a fluid changeout I have gas in it.
Went to billet CV pumps but haven't ran them yet.
Hopefully this will be the answer.
If not electric fuel pumps are next.

Dennis

Maybe I'm one of the lucky ones

Actually, I have done several upgrades with these setups and have always replaced the diaphram assembly with a Holley high volume diaphram assembly off of thier pump set up (note: you can not use the Holley armature assembly) Just remove the 6 (or 8, don't remember) and put in on in any rotation that fits your set up.
I have not had a failure or leakage on any of these. The old Merc/Carter stuff must not like the environment or like I said I may just be on of the lucky ones

Dave

I have not checked the fluid, but now I will.

Do all 525EFI's have mechanical fuel pumps?

I thought I had electric fuel pumps because I hear a 3-4 second prime when you turn the ignition key prior to starting.

You have a low pressure mechanical lift/feed pump and a high pressure electric pump.

Thanks Stan if its something i can't handle(like a drive ) you'll be the first one i call.

Sal definetly check this when you do your first 20-25 hour oil change. I bet your enjoying that new boat

You know it Mark!

3 weeks and 20 hours so far! I just finished the first fluid and filter change this week, but need to check the fluid in the seawater/fuel pump.

Thanks for the info. The mechanical pump seems pointless, but maybe there is a reason for the madness.

Gen V motors eliminated the block mount for a fuel pump. Cars with EFI use an electric pump in the tank, no need for it.
Electric pumps push better than pull fuel, so merc would have to set up a differnet configuration for every boat make in order to get electric tank mounted pumps to work. Add to that a long highly pressurized gas line from the tank to the engine = fire hazard.
So they put a mechanical pump on the sea water pump to pull fuel to the engine. The electric pump pressurizes the fuel for the injection.
Gary

any time you need help mark..
we are thinking of going to manteo nc me and frankie
want to go ?

He told me earlier in the week he was taking the crab boat down there. I think we're going to take a short cruise down to Smithfield Station for the night.