Thread: Fuel pump ?

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I have a new old stock AC delco fuel pump that was given to me, never been used, I know its twelve volts not sure what kind of pressure it puts out, it has a date code of 7-77, it cleaned up nice and I`ve made a frame bracket for it out of stainless, but before I install it would you guys use it, it has a nostalgic theme to it, kinda fits my build.

even if you dont have it functional put it somewhere in line so it will show if you like it that way .. just let fuel blow thru it

Hook it up to a 12 volt source and let it run for awhile. If it seems ok, then use it.

Originally Posted by sunsetdart

Hook it up to a 12 volt source and let it run for awhile. If it seems ok, then use it.

Wouldn't you want to have it flowing fuel for this test, like maybe pumping in a return loop back to the tank? I would wonder about running it dry for any extended period of time.....might be good when you start but ruined by the test?

I can use a test can, just hook up a ground and a hot lead, it does come apart for sevicing thou I haven`t had it apart ...

I'd check it as you described to ensure that it works and if so I'd plumb it in along with a regulator and fuel pressure gauge.

The mod number is the psi in your case 12 psi

DONT run it dry for more than a few seconds!!! Most electric vane pumps are
cooled by the fuel flow and dont like pumping air.

You can wire in a neat fuel pump shutoff using a 96-2000 chevy vortec 5.7 truck oil pressure switch...it has a circuit that opens when the oil pressure dies. If you wire a relay coil thru the switch, when the engine is off or the oil pressure dies, the fuel pump is shut off. You also need a hot feed on the start lead of your ignition switch to energize the pump when you are cranking.

Those were actually a pretty good street pump. I ran one years ago on my Ford powered Sprite and it never overpowered the Holley carb. As I recall it was something like 4-5 psi. I don't know if they are still being made or not, but haven't seen one in years. Nice nostalgia piece. Worst that can happen is it craps out after a while and then you have to deal with putting something else in it's place.

Don

Well sinse I don`t trust the one that is in there, this might be the time..

Just be aware that excessive pressure into the fuel bowl will overpower the needle and seat and blow raw fuel into the intake manifold. This will generate tuning nightmares that will make you crazy.

Carter AFB, Edelbrock Performer and Quadrajet will tolerate a max of about 5 1/2 psi. Holleys will tolerate a max of about 6 1/2 psi. Install a quality regulator and adjust accordingly.

You need to monitor the pressure under driving conditions, so tee off at the fuel inlet at the carb bowl and run a piece of nylon or copper tubing back to the firewall, then up past the hood lip to the cowl in front of the windshield. Temporarily (with tie-wraps or racer tape or whatever) mount a 0-15 psi gauge so you can see it through the windshield while driving. If you don't do this, you'll never know whether you have the optimum pressure going into the bowl or not.

if it's never been used since new...I'd guess that the gasket(s) might be a bit dried out. I'd either replace them, or maybe soak the pump in some kerosene just to fatten up that gasket a bit.

dj

Already have press req and qauge, and I did soak it for a few days now, tomorrow will put the 12 volts to it from one can to another. Sad thing is I will have to drain my tank before install, want to change all the old line out to the pump with a new one, in fact maybe I`ll just change it all out all the way to the motor sinse there is a union about half way up that I did many years ago, opinions wanted filter canister before pump or after...?

Originally Posted by 406Rich

opinions wanted filter canister before pump or after...?

I like a nice big cartridge filter between the tank and pump, one that I can get to in order to change regularly. If it gets clogged, it will tend to burn up the pump. If you don't have a filter between the tank and the pump, then you'll be runnin' trash through the pump and that ain't good either.

You'll see suppliers of pumps tell you first one way and then the other, so in the end, do what makes sense to you.

Yep, before the pump. Some also install one after, but I just do the one before.

Don