Fuel Pump Question 548 ci with 256 blower
 

I'm working on a 540 (548) all refreshed, with a wieand 256 supercharger (dual carb set on on top, Holley blower carbs)
There is a mechanical fuel pump on top of the raw water pump, I believe it is a stocker (and it was on it prior to the rebuilds so it ran that way for some period of time) root cause of failure was a valve dropped into the cyl
the blower pressure is 4lbs ish (not huge boost)

Heads Are grumpy jenkins
Cam jb300 erson
And the engine is stroked...4.25 crank

The combo seemed to work well

Which fuel pump should I be using, I was told that I would need to go electric, I would believe I could get a mechanical that would support it and not have to redo the plumbing

I was told that these engines had alot of hours on them (I also know that they came from a sonic some years ago maybe built in 96 in the past perhaps somewhere on the east coat prior to transplant into the boat that I'm working on now)

I've never used one, but......

http://www.cpperformance.com/p-12460...6-engines.aspx

I have a super charged engine and I went to an electric fuel pump. I installed an aeromotive one and it works great no problems

I sold tigerweldsm a keith eckert mechanical pump that is specifically for that app. They run about $250 new with adapters shipping ect

Just take any Holley pump that screws together and use the bottom half with the mercruiser top half. Works great

I have one of the KE's for sale in the swap shop

whats the P/N?

Cv makes a mechanical pump goes right to your see water pump that's a what I use

personally I never cared for the merc water/fuel pump combo, prefer something like a aeromotive A1000

there is only 1 battery in the boat, and really dont want to re-plumb the system, so at this point electric is out, as they eat 10 amps combined while running (real world amps)

SPIN-MP-2630 pretty sure that is the part # for the pump call cv everything racing 1-800-448-1223

I use the CV as well, They are pricey but the best IMO for a mechanical pump.

On a different note I think you are maxing out your blower ..
I am surprised your getting 4lbs of boost on tthat engine..
a healthy 540 with cam and heads by itself flows more than that blower
can provide without creating excessive heat..

[QUOTE=HTRDLNCN;4285681]On a different note I think you are maxing out your blower ..
I am surprised your getting 4lbs of boost on tthat engine..
a healthy 540 with cam and heads by itself flows more than that blower
can provide without creating excessive heat..[/QUO

This was the way it was I just rebuilt them they way they were (pistons have negative in them) what brought up the question here was the installer was talking to someone who may know about suprchargers (altho I think he has history on larger supercharged applications) and his point was that the pumps would not support the application, in which where the electric fuel pumps have been discussed, and thats where I'm at here, trying to figure out if I really need them and hack up the curent fuel system that has ben on this application since I would surmise 1996, but 1 of the pumps are bad leacking thru the base, in which I do not know what they are..... I do know that they are not billit alum. and that they are not KE pump heads

Cv Products makes a billet pump with different diaphragm springs, I would use a regulator with it. They are pricey, but 100% rebuild able, I have used many of them over the years. Also they will not leak fuel back into the seawater pump and dilute the gear lube.