I got my engine in my car and the electric fuel pump is pumping gas through the regulator after I turn the key over and then it stops. Its not even getting enough fuel to start the engine. I need to figure out what the deal is with that. (what it does get at first isnt even enough fuel to run a lawn mower.) Does the fuel pump suppost to keep gas running into the regulator and carb at all times with the key turned over? Like to use what I have. Any help are suggestions would be great. If I cant get it to work I will buy a manuel pump and pick-up tube.

 

Pump needs to be wired into 12V ignition source, or you can wire it to a toggle with a relay so YOU control when it's on or off. The pump will always be pushing fuel to the regulator when its on, the carbs floats will determine when to let more fuel into it.

What kind of pump, what kind of regulator? If you got one of those Purolator electic pumps that may be your problem

 

Where do Iwear it in at? The regulator is a mallory 3 port. You say to use a 12v ignition source, where is one located at? With it hooked up like u say, it let the fuel pump, pump at all times. With it not, thats why it stops pumping after the has been turned. If I try the relay how do I wire it? Thanks for helping. Have u did this berfore?

 

You are exactly one year older than me, to the day.

Anyway, a 12v source means that the pump is hooked up to a power wire.

A relay would use a standard automotive 30a, 4 prong relay. I got mine at Radio Shack. IT has 4 prongs. Big power wire in, power wire to the pump, ground, and a power wire through the switch. Flip the switch, close the circuit, give the relay 2 power feeds, and the relay gives power to the pump. i would put a fuse on the big power wire to the relay.

What pump is this? Do you mean that you turn the key on, the pump activates, but then stops? Or the pump just pumps, but is too weak to support the engine? How is the pump wired now?

 

My stock pump went out about a year ago and I replaced it. Not sure what brand. When the keys turned over it sends fuel up then after about two are three seconds it stops. I think hooking a relay up will fix it. Thats the answer Ive gotten from everyone.

 

There is an oil pressure sensor just above the oil filter. This is what actually runs the pump. All the computer does is prime the pump when you turn the key. If this sensor is not hooked up and functioning properly then the fuel pump will not run while the car is running.

Make sure you have that sensor hooked up. I don't recall what color the wire is but it comes from the pass side fender, behind the motor and plugs into the sensor just above the oil filter.

Mine responded the same way you are describing until I had that sensor hooked up. It took me forever to track down this info. Everyone on here says to just hotwire it but all you need to do is have that sensor hooked up.

Hodge

 

I did a jumper wire and it put way to much fuel out to the carb, even with the regulator turned down. So I'm going to go with a manuel pump and suck it through the elec. The sensor that ur talkn about is hooked up. That was the first thing that I checked. Thanks for the info.

 

What in the heck are you talking about? what did you set the fuel pressure at? what kind of regulator and carb?

Holleys can take 8.5psi before fuel pushes past the needle and seat, Edelbrock/Carter I have no idea but would assume 8psi would be sufficient. Do go any higher than that.

It is entirely possible your regulator is bad if you cant turn it down to 8psi and have it hold. Is it a return style regulator?which you need if using a EFI pump since they are extrememly high pressure and need a return line so the excess fuel can return back to the tank.

 

The regulator is a Mallory 3 port, which has return line, and the reg is new. I'm useing a Holly 600. The fuel pressure was 4 to 5 and it was pushing the float up and gas was startn to get to the top of the carb where the floats located. I think exactly what u said, the regulator is bad. I'm not even going to deal with all of that. So there for I'm just going to stick a manuel pump on and a inline fuel filter and be done with it. All that will need to be done then is tune the carb. Oh yeah the fuel pressure gauge is new to.

 

A jumper wire means, I found the fuel relay and connected a hot wire to hit so that it would run with the key on at all times. Meaning the pump was constantly running, way to much fuel, think reg is no count.

 

Do you have the float set correctly? With only that much psi, setting the float will correct any problems since the needle and seat will stop un-needed fuel flow until the carb needs it.

Sounds like everything you have is the right stuff, just needs fine tuning to optimize. Since you already have the psi at the regulator output at 5psi, go ahead and remove the screw on the side of the bowl and check float levels. If fuel comes pouring out of the sight level plug, turn pump off and then turn down the float. Turn pump back on and see where your at, try to get it so no fuel comes out of the sight plug.

Once you've gotten the fuel level below the sight plug, leave the pump running, DONT LEAN ON THE CAR when setting flaot level as this will screw it up since the car will be "pushed down in the front" with your added body weight, anyways, with the pump running, slowly start raising the float level until fuel just BARELY trickles out of the sight plug. Once you've established float level is correct, go ahead and turn up your fuel pressure to 7 or 8 psi, then double check your float level.

Is the carb new or used? Either way it's possible if you installed any new fuel lines some garbage inside the lines or junk in the tank may be holding your needle and seat open and that's why your getting fuel levels too high.

Your already 3/4 of the way there, dont stop now. If it is a internal carb problem it will show up even when you install the mechanical pump.

 

Ill check the float again. I did that last night and it seemed fine. Thanks for the help on it IHI.

 

Your right there at the finish line, just hate to see you give up when your this close. And like I mentioned, if it's carb related why your getting fuel spurting out of the vent tubes then it will do the same thing even with amechanical pump. Let us know what you find out and we can go from there.