fuel pump set up

[bigchevyc30]

ok so im looking at replacing the old manual fuel pump on my 1980 chevy c-30 dually for a electric set up is there a way i could set it up to run the electric and have it not keep pumping fuel into my eldelbrock 600cfm 1409 carb when i go to start it. i know this is going to confuse people but im talking like for when i turn the ignition on i dont want it to over fill my carb if anyone gets what im saying. im wanting to put the electric so as the little amount of power out of my 366 tall deck actually goes to the rear and not to run the old fuel pump. also would anyone be able to give me diagrams to run the wires and things to have it do this. i hope you guys have the answer im looking for.

[beastie_3]

You can just wire it up to a switch. Use a relay and tie that into a key hot wire so you dont forget to turn it off when you get out of the truck.

[Captkaos]

You are going to have to use a regulator on it also unless you get a pump that maxes out at 7lbs.
Keep in mind you are just moving the load from a mechanical one on the pump to an electrical one on the alternator.

Not remotely worth the effort in my opinion if you motivation is removing parasitic loss.

[1980c10]

A mechanical pump is perfectly capable of running your engine properly and is much more reliable than an electric pump. I would leave it.

[1979C20]

Does your mechanical pump currently have a return line? If so, you could piggy back the pumps. Feed the electric into the mechanical and any extra fuel will return to the tank through the mechanical pump return line. Then you could use the electric pump to prime the system. And if either one fails you have a backup in place already.

[bigchevyc30]

that sounds more like what i would want to do c20 cause when i have my truck sit overnight it takes a while to get the fuel up to the carb to start it up and even longer if it goes a day or more

[muddpuppy01]

you try putting in a check valve to keep from draining out another issue could be your well plug in the carb leaking

[bigchevyc30]

well we just had the carb rebuilt completely about a month ago when my dad was home cause it started leaking when it ran. but i htink the gas is evaporating out of the carb as when i go to shut it off sometimes on hot days it will diesel

[HAULIN IT]

It sounds to me that you have multiple problems:

is there a way i could set it up to run the electric and have it not keep pumping fuel into my eldelbrock 600cfm 1409 carb when i go to start it. i know this is going to confuse people but im talking like for when i turn the ignition on i dont want it to over fill my carb if anyone gets what im saying. im wanting to put the electric so as the little amount of power out of my 366 tall deck actually goes to the rear and not to run the old fuel pump.

This sounds like the float(s) are too high or the needle/seat is getting trash in it. It doesn't matter what kind of a fuel pump you have as the fuel pump isn't the problem. Even if you got it running with the fuel in the bowl & then turned on the electric pump...the first time you came to a stop light your carb would overflow. The idea of the mechanical fuel pump "using power" that is in any measurable amount is silly, just silly!

that sounds more like what i would want to do c20 cause when i have my truck sit overnight it takes a while to get the fuel up to the carb to start it up and even longer if it goes a day or more

Something is likely leaking, I've not heard of common problems with drainback of Edelbrock carbs. Run the truck then unbolt the carb, lift it up on the bolts so you can put coffee lid or something between the carb & intake, check it in the morning. 

well we just had the carb rebuilt completely about a month ago when my dad was home cause it started leaking when it ran. but i htink the gas is evaporating out of the carb as when i go to shut it off sometimes on hot days it will diesel

The gas is not evaporating out of the carb.Try the highest octane gas you can buy & your run-on will likely stop.
You have the same problem you did a month ago...you carb needs fixed. Lorne

[big bear]

i agree...i am pretty confident in thinking the carb needs repaired again.

[muddpuppy01]

The dieseling most likely a timing issue.

[bigchevyc30]

well it did the dieseling with both this motor and the old motor we had before we replaced it. so im not thinking its timing the only thing is we used the same carb on both motors. when i back my truck up in the yard the temp is 190 but it only diesels on really hot days if its cool out it wont do it

[muddpuppy01]

then just keep it in gear when you shut it off if you got a auto it wont diesel that way

I don't see how a carb could cause your dieseling problem as a carb will allow fuel to be drawn into the motor as long as there is a vacuum. Vacuum is created by the firing of the pistons. Firing of the piston is the ignition system. So you may have a voltage leaking problem or a pre detonation problem causing the fuel to ignite.

One way to check would be to pull the power to the hei. If it stops dead in its tracks then I would lean more to a voltage leaking issue other wise you may have some build up in the combustion chamber.