Okay so how to install this thing??? My current dilemma is that I get pressure spikes from my stock pump, and I don't think that the current pump will suffice for the kind of power I will be putting out later. So how do I wire it?? Am I just supposed to run a hot ( ignition) wire back to the pump and that is it??

Do these things have fuel pressure regulators already on them???

Any help would be appreciated. This is the in-tank pump part # 12-903.

Matt

 

should just be a direct swap. i have that pump in my car. just plugs right in.

 

Yeah so if I have the problem with the stock pump, won't it continue with the aftermarket one???

I was told that there was some way to wire it directly to a constant source so that it would not be affected by the compuiter whatsoever.

 

u mean a switched ignition source, cuz a constant will just burn up the pump and just kill ur battery.

 

You could buy a harness from these folks...

http://www.racetronix.com/product/RX..._Pump_Kit.html

I bought the entire kit with the walbro pump but another buddy of mine just bought the harness. This should supply you with a constant voltage (13.6 i believe) in a plug and play harness.

HTH

-Schultzy

 

I know that if I hook the pump to the battery it will stay on. I am not a moron. geeezzzz some of you guys crack me up.

I also do not mean that I want a constant voltage while retaining the connection to the stock/computer controlled setup.

I want to know if anyone knows the best way to hook the pump up to a switched ignition source for a constant rate of power, and no computer input.

 

geeeeeez i was trying to help. i figured that the included relay and direct connection to the alternator would give you what you (attempted?) to describe. i guess i don't have one of those fancy computer controlled fuel pumps.

i'll keep it to myself next time. you obviously have things well under control.

good luck with your project.

-Schultzy

 

If all you want to do is hook the pump up to a switched ignition voltage, then find a wire on a wiring diagram that is switched 12v. Then splice into it.

Out of curiosity, what is wrong with your current wiring, burned up or something?

 

I was told by others at this board that the computer controls the fuel pressure to a point. I get spikes from 5 psi up to 8 all the time. I am not running efi, I am running a demon carb and a mallory 3 port regulator. So what happens is I'll get the carb in tune at 5 psi and then it kicks up to 8 psi and the car runs all crappy.

I know that the computer does not actually control the fuel prssure as in the psi, but I guess it controls the voltage???? I can't see how else the stock pump would produce spikes all the time. I changed out the fuel filter last time I was at home and it had no effect.

I figured that I would need a better pump now that the new motor is going in but if the problem persists, I'm gonna be pretty pissed off.

 

Installed the new fuel pump, along with the new engine.

The problem persists. I am at wits end with this freakin' fuel pump problem.

I looked at a diagram in Chilton's regarding the fuel pump circuit as it is connected to the computer. Man there is a bunch of crap in line to the fuel pump wiring, like the oil pressure cut-off switch, and some other crap. The computer has 3 ports used for the fuel pump and it's connections, I can't figure out which one needs to be spliced.

Anyone else know what I need to do here???

 

The computer DOES NOT control the fuel pressure. All it does, as far as what you can't do with a switched ignition feed, is to tell the relay to prime the system for 2 seconds at startup and then shut it off and wait for the engine to begin running.

If your FPR lets the FP vary from 5 to 8 psi, then it's not a regulator any more. It's just a pressure reducer. It's broken. Get a new one. It has nothing to do with your pump. Some other pump won't fix that.

 

What is a pressure reducer, where is it located???? I am assuming it is located on the return line to the tank, but that is just a guess.

 

go buy a new mallory 3 port and be done with it. that's all you needed to do.

 

You mean replace the one I already have???

What, they blow out that easy???

 

Your former regulator is no longer regulating. It is merely reducing the pressure. It is not working correctly. It needs to be replaced. It is defective. The pump is not "producing spikes"; rather, the regulator is failing to regulate, and is instead only reducing the pressure randomly. I don't know about "blow out that easy", all I know is that when something isn't doing what it's supposed to do, it is broken and should be repaired or replaced.