Unplugged FPR, runs the same.

[lolcantturn]

M42 car. Lil rough idle. Unplugged the vacuum line to the fuel pressure regulator, car still runs the same (plugged the line with my finger to not cause a rough idle from a vacuum leak). Probably a faulty FPR, right?

[vpilarrt]

Maybe not. IIRC FPR only changes the pressure when you rev the engine.

[lolcantturn]

Maybe not. IIRC FPR only changes the pressure when you rev the engine.

Fair enough. I'll rev the engine with it unplugged and see what happens.

[TobyB]

Not as I understand it. FPR vacuum line keeps the fuel pressure linked to intake manifold pressure at
all times.

The only way to really tell is put a gauge on it, then unhook it and try pulling a
vacuum on it. Fuel pressure should be about 45 lbs - whatever vacuum you're pulling
on the port....

t