Gen V or VI Mechancal fuel pump
 

Does anyone make a mechancial fuel pump that mounts on the sea pump housing that has 1/2" fittings?

Re: Gen V or VI Mechancal fuel pump
 

I'm not sure, but I don't think so. I believe that pump is not interchangeable with any other BBC pump. And I have never seen an optional one offered by Mercury Racing. If your looking for a major flow increase, you may have to go with a quality electric pump.

Re: Gen V or VI Mechancal fuel pump
 

cp offers upgrade for merc pump no others available cp pump good for about 600-650n/a depends on fuel lines

Re: Gen V or VI Mechancal fuel pump
 

Yup, Hardin Marine had one on display at the Key West vendor area

Re: Gen V or VI Mechancal fuel pump
 

CV products offers a billet fuel pump that fits the merc seawater pump. It will handle at least 700hp. It is expensive, but it is the best pump available, and is rebuildable for under 100 bucks when the time comes.

Re: Gen V or VI Mechancal fuel pump
 

Don't spend a lot of $$$ on a speacialty pump if the armature part of the sea pump mounted pump is in good shape!
Any high volume Holley or Carter with the 6 hole pattern will interchange the diaphram housing and rotate to any position you desire.
I promise!! I use these pumps to force feed the high pressure pumps on EFI blower motors. :drink:

Dave

Re: Gen V or VI Mechancal fuel pump
 

I have used the carter on a couple of motors and worked great.

Re: Gen V or VI Mechancal fuel pump
 

Thanks for the reply's. What I have now is the stock merc pumps which are good, but I think I am going to need more volume for my 625hp motors. That is why I want to switch to the larger 1/2" fuel line.
Thanks again,
Greg

Looking at the seawater pump mounted fuel pump, can someone explain how to remove the arm off the old pump and the diaphram. I have several new engine mounted Merc pumps and hate to drop $160/ea for 2 new pumps.

What you do is unscrew the approximate 6 or 8 screws on the lower half of the pump. Seperate the two pieces, and switch them.
I bought the Keith Eikert pumps and they were only the lower half's, but had the larger 1/2" ports. I have been very happy with them.

I have the KE pump upgrade that CP sells, with 1/2" lines, and a big filter my fuel pressure still drops from 6.5 to 3 psi at WOT. I am a little unsure if you get any improvement over stock except for the "bling." The valves in the stock pump bottom and the KE pump look the same to me. I can't really say that the KE pumps are better/worse than stock because I never checked fuel pressure with a stock pump, but it did feed the engine for years without a lean meltdown.

After unscrewing the screws, the diaphram is connected to the base of the pump. With 3psi pressure on my old pump I think the diaphram is shot and needs to be replaced. Just need to know how to change that or the arm.

If the diaphram is bad you will get a lot of gas in the 1/4" vent hose and/or the oil sump for the pump arm ecentric. I have not found a way to get at the pin to remove the diaphram and rod from the arm.

go with a black holley elc pump and be done.:D

Changed out the pump, no gear oil in the reservoir and the spring under the arm was broke, the other pump was 1/2 full with gear oil. Both now at 8psi. Also ordered 2 Holley blacks, they should be in next week…

Do NOT buy a Holley black electric pump. I had those on my Scarab, One pump a season, after 3 seasons went back to mechanical. No problems now.