i just bought a aeromotive fuel pressure regulator for my 1994 Z28. I have the fuel rails off but i'm unsure how to install it? How do i adjust the fuel pressure? by the fitting on the top or on the side? I also wanted to hook up my fuel pressure gauge. do i just plug the braided line coming from the fuel pressure guage into the fitting on the back of the fuel rail near the regulator? thanks guys!

 

Not sure about the FPR but as far as the guage goes you can do it the right way or take a chance and do it the easy way. I assume you are running the guage in the passenger compartment. The easy way is to just attach one end of the braided line to the schraeder valve on the back of the fuel rail and the other end to the guage inside.
The right way is to spend another 90 dollars and get an isolater which you are supposed to have according to the sanctioning bodies. Your choice. I recently ran mine without an isolater do to it sh!ting the bed and my friend also runs his without an isolater. The only bad thing is the firewall wll is supposed to protect you from fires if you have a fuel line running inside the passenger compartment...you get the idea! Hope that helps

 

you just wasted the money for the regulator. the pcm will correct for the drop in the fuel pressure. so it will render the a/f regulator useless. the pcm will add to pulse width on the injector thus added the fuel more fuel to compensate for the drop in the fuel pressure.

sorry

if i were you i would sell it.

 

Pretty much, and tuning the pcm to get the RIGHT AFR all the time costs much less than a regulator and gauge.

 

i thought that the advantage of the fuel pressure regulator was so that you can either lean or richen the a/f ratio.

 

if not then i just wasted like $160. Anyone want it for $125 shipped brand new in the box?

 

Bad news on at least 2 counts... 1) as noted above, you can't adjust A/F ratio with an AFPR on 94 and above. 2) the Aeromotive AFPR is a major problem. Try a "search".... there are numerous posts over the past year from people who bought the Aeromotive, only to find they were defective out of the box, and could not adjust the fuel pressure below 60psi or so.

And finally, to ruin your day, you are absolutely nuts if you install a mechanical fuel pressure gauge inside the passenger compartment without the correct high pressure isolator. I personally would not even install one with the isolator, because I had the AutoMeter high pressure isolator fail and allow fuel into the line inside the car. They have recalled and replaced their isolator a few times, and the cost of the current model (PN5282??) is about $110.

 

You can adjust AFR with an adjustable regulator, but the pcm will quickly learn it out because you changed the whole fuel curve and al you should really be looking to change is the WOT fueling. Having the pcm reprogrammed costs under $100 and does a better more precise job and will not be learned out.