GarvinMJ

Got a bit of a weird problem with my setup. I'm running an '88 L98 TPI setup on my Jeep and am having some fuel pressure issues. All the injectors work and everything works great for the most part until the fuel pressure regulator sticks open. It's a brand new diaphragm in there that I replaced a month or so ago because I had the whole setup apart. It ran fine for about 400 miles and then started to stick (I can tap the regulator housing and then get my fuel pressure back). I'm running the E2000 external fuel pump and not sure if that's causing too much pressure to stick the regulator open?

Has anyone swapped the E2000 external pump on and get any regulator issues?

ASE doc

I am not familiar with the E2000 fuel pump. However, if all is as it should be in the regulator, there is really no way it should be sticking. It should be able to open fully under low manifold pressure,such as when decelerating, and then close back up regularly. It may be that your fuel system is just more than the stock regulator can handle. My system is unusual and I run very high rail pressure. I have switched to a remote mounted regulator in order to control fuel pressure.

GarvinMJ

Thanks for the reply. The only thing that worries me is the E2000 puts out 65-90 psi (not sure what a stock Camaro pump puts out) and it might be overpowering the regulator. The pressures on the gauge show 50 with KOEO and about 43 when KOER so it sounds like it's within specs (atleast according to what AllDataPro says). I didn't think there was a way of it sticking either since it's all mechanical and the spring should be keeping it down. I did replace the regulator under warranty and it has helped some. It does still stick when I first turn it on something though (sits at 25 then with a few swings of the throttle linkage it pops up to where it should be, hear a little click sound when it happens also).

I have looked at the external regulators, they're just a bit out of my budget right now since I have a few other things to fix on the Jeep first. For the remote, I'm assuming you just completely remove the factory diaphragm? Is there a way you seal the housing back up? I was toying with the idea of cutting the inside out of a junk one I have since the outside is good and just clamp that down as a seal.

ASE doc

The stock EFI pumps run 100psi on dead head. What we are concerned about on the aftermarket pumps is higher flow rates that push the regulator too far open and can damage the diaphram. Still, aside from the diaphram rupturing, the regulator spring should push it shut. Especially at 25psi. I have run a Mallory EFI pump that produced 100 psi and 125GPH. Now I run an Aeromotive 750 that runs 370lbs/hr at 70psi. It's barely enough pump for the motor but I'm not ready to spend the extra$$$ for their 1000 series pump and controller.