Originally Posted by Sr.Mazmia
I installed it between the fuel rail and the fuel feed line. Does anybody know what i did wrong or what i need to fix???
What you did wrong is just before where you ask what you did wrong.
Fuel pressure regulators work by causing a restriction to the flow of fuel through them.
In a recirculating fuel system, any fuel pressure regulator must therefore be installed after
the fuel rail, between it and the return line.
If you install any fuel pressure regulator between the fuel rail and the supply
line, then the regulator will cause fuel pressure at the rail to decrease
as the regulator's reference signal rises.
The correct scheme for installing an AFPR on a '90-'97 Miata is:
Supply line -> fuel rail -> stock FPR -> AFPR -> return line.