I'm installing a ffi on my 350tpi car. The fuel lines basically run the same as the tpi. The pressure regulator has been spliced into the return line hose between the frame and the hard line in front of the engine. I tested for leaks and finally after multiple injector installs I think it's leak free. Problem is the fuel pressure gauge doesn't show any pressure. Right now nothing is connected, no vacuum lines or injector connections. I tested for leaks by turning the ignition key until I hear the fuel pump. The gauge will jump a little and then go back to 0. Shouldn't I see pressure when the ignition is on? I think I remember that the aeromotive regulators don't hold pressure when the car is turned off unlike a tpi regulator. Is there a problem or is this normal?

 

I think everything is normal. I found this after some searching:

The Aeromotive, high flow, adjustable regulator is designed for flow and
pressure control with the engine running. The EPA requirement to hold fuel
pressure when the engine is not running requires the regulator to be
modified in a way the would reduce it's performance in all area's.
Aeromotive does not, nor do it's customers on the whole, prefer to sacrifice
performance for this purpose. We do attempt to create the best sealing
surface possible, but whether out of the box, or after a period of service,
it is not uncommon to see fuel pressure drop when the pump stops running.
This is NOT an indication of a problem in the regulator and has no effect on
it's performance when the engine is running. I'm afraid there's nothing you
can do to change this.

I hope this answers your question and assures you there's nothing to be
concerned about. Let me know if there's anything else you need and thanks
for choosing Aeromotive!


Brett Clow
Aeromotive Tech Dept

 

I was never concerned about the fuel pressure dropping off after the engine is shut down, but you have to be able to build up pressure at key on or it will not start. I would think it should build and drop off slowly.

 

Glad to see you putting my old FFI on.

 

You have the injectors out of the rails, and you don't see pressure? I would hope not. If you do have the injectors in the rails, and you still don't see pressure, then maybe you connected the regulator backwards? You have the pump connected to the return side of the regulator. I did that once and obviously there was no pressure showing at the rails since the regulator was wrong

 

Yep, it wasn't as difficult as I was expecting. Probably because I already had TPI.

 

I got it up and running. The fuel pressure is fine when it's running around 35 at idle and 48 with no vacuum. It just bleeds off quicker than I can get out of the seat and look at my gauge. I still have to
adjust the prom. I'm waiting on a new knock sensor connector to correct a code 43 right now.

One problem on the throttle body is it's sticking open and causing a 1,500 rpm idle. I emailed Ken for help.





Thanks all.

 

 

Did you go through the IAC reset procedure that Ken outlines in the manual? (Just curious if you're certain that it's the throttle physically sticking open as he mentions needing to go through the IAC reset procedure.)


Adam

 

I took off the TB and it was sticking just before it closed. It needed an extra push to close all the way. So I sent it to Ken and he repaired it. Both washers on the shaft were on the same side of the TB. Hopefully it will be waiting for me today when I get home.