if you have throtle body injection the regulator should be right on the throttle body it self.On a 1996 Chevy truck there is not a throttle body , the regulator is under the upper plenum(the plastic piece that sits on the intake)also the injectors are under there as well all 8 or 6 witch ever motor you have.
Fuel pressure regulator built into fuel filter
the FPR(fuel pressure regulator) is part of the fuel filter assembly. Which will cost you about $60-$80
A very dirty, plugged up fuel filter could do that. A faulty fuel pump or fuel pressure regulator could also do that. Have a fuel pressure and flow test done.
The gas is probably not leaking into the filter but the engine. It's caused by a broken diaphragm on the fuel pressure regulator. Replace regulator
Check fuel filter and pump pressure.
The filter is part of the fuel pump/strainer/pressure regulator assembly in the fuel tank.
I belive it to be built into the fuel filter on the e46
Its included in the fuel filter 98-02
Fuel regulator is part of the fuel filter under the car by the drivers side passenger door
Fuel filter, fuel regulator are fuel pump.
Try replaceing the filter or the fuel pressure regulator.
Check: - tune up (plugs, wires, air filter, fuel filter, pcv valve) - fuel pressure/fuel pressure regulator/fuel pressure relay