Probably a long shot but…
Just curious if anyone has ever upgraded the seawater mounted fuel pump on a Gen 5/6 motor. It is just a standard Carter pump so I believe that I could just swap the indexable part with the Carter Comp series (p/n 61045).
This pump has the –10 inlet and –8 outlet vs. the ¼ NPT holes that the standard pump has and also has a higher flow rating.

Thanks,
Dave

Yes,
I did it two years ago under the recommendation of someone at CP performance.
Because of that I ended up detonating the hell out of my brand new 502 and grenaded it. Fuel pressure was the last thing I checked ( I don't know why) and when I put a gauge on it , it was barely keeping the float bowls full (1050) .
My fault for not checking the fuel pressure first !

I did it with a couple of pumps from CV Products 2 years ago.

rbtnt and 26Scarab,
could you maybe clarify just a bit.
I believe the only thing unique to the marine fuel pump is the armature device.

26 Scarb, did you just buy a Carter 61045 and swap the lower unit or did you buy the upgrade from CP Performance which, I could be wrong, but I'm thinking is just a 61045 bottom unit.
If that's the case, then I can buy the entire pump from Summit or Jegs for $90 or I can buy half of it from CP for $150

rbtnt, what is CV products?

thanks,
Dave

I'm using the "stock" pump lever assembly with the upper from the newer Holley Marine pumps. I maintain 6# with twin-carb blower motors. The Carters didn't use the size fittings I needed.

Nordic,
I bought the "upgrade" kit from CP.

I have since been told that the arm stroke ratio on the Merc pump than on a standard pump. In my case I believe it but other people are doing it with good results .

I have had a carter pump on my boat for two years. Works great.

Thanks Scarab26,
what do you mean by the arm ratio? I would be using the same arm so wouldn't this be a non issue? Confused ;o)

Cignificant,
just to clarify, you changed only the two piece pump body (inlet and outlet) and left the armature housing in tact to the sea water pump assembly.. Correct?
Which Holley pump?

Thanks,
Dave

Dave,

I'm using the stock lever assembly from Merc that bolts on the sea pump and a high output pump body from CV. The only thing I had to change was drilling the thread out of the screw holes on one of the units. I think I drilled the threads out of the lever assembly, both units had threaded holes. I then bought some stainless steal allen head screws to screw them together. I still use the green plastic hose from the pump to the flame arrester in case of pump failure.

The only way to buy the high output pump from CV is a complete pump with lever assembly.

Randy

That correct. Originally I had Holley pumps with 1/2" inlet/outlets. The "arms" had been cut and then welded so they would work with the sea water pumps. (I bought then from the OSO "parts for sale" section) They both went bad about the same time. Gas was leaking through the seal around the "arm" - I think the seal may have been damaged in the welding process.

Anyway, Holley no longer makes the 1/2" I/O pumps (I think the part# was 712-454-1). So I bought the 3/8" pumps. Holley's part number is 712-454-13. They match up to the bolt pattern on the stock Mercruiser "arms". Match the stock arms to the Holley "uppers" and that is what I have. It actually works better that the pumps with the 1/2" I/O.