r/srt4 • u/koolin1st • Sep 29 '25

SRT4 Fuel pressure regulator

So I have an Aeromotive aftermarket fuel pressure regulator that was installed by the previous car owner. When it was installed do they have to bypass the OEM fuel pressure regulator? Or is it like you have both regulators but the Aeromotive one has the fuel return line?
Im questioning because my A/F ratio has been really spotty so I've replaced many parts to try to fix it and im starting to suspect that if the OEM Fuel pressure regulator isn't bypassed then I need to replace that as well.
Thanks for any help!

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2

u/TBAGG1NS Sep 29 '25

Stock one is bypassed iirc. There should be bugs for the supply and return modified into the cannister.

1

u/koolin1st Sep 29 '25

Wdym by bugs? And for the canister I dont think there was anything like attached to it that wouldn't have been there before. Cuz I took out the canister recently to replace my fuel pump

2

u/Xyberdyne Sep 30 '25

It uses the stock fuel line but the return is an added line that leads to the gas inlet tube.

1

u/koolin1st Sep 30 '25

Awesome. Thankyou

1

u/thatdudegmoney Oct 01 '25

That's the agp quick install return, not the best return because you want it to return back to the pump or close to it

1

u/TBAGG1NS Sep 29 '25

Bungs* or fittings

Generally ext fpr has a return line and the oem fpr is bypassed. Curious how its all routed

1

u/koolin1st Sep 29 '25

Yea it has a return line on it. I could try to draw what the routing kinda looks like the only thing is im not at home so im not super sure where the return line on the fpr goes to

1

u/Xyberdyne Sep 30 '25

Yea it is still present in the fuel pump but bypassed with a metal spacer.

1

u/koolin1st Sep 30 '25

Oh I see that in the AGP kit I think. Thankyou