Just wondering, I was tinkering with stuff today and pulled the line by accident off the Plenum to the FPR and nothing happened. Curious, I gave it some gas, and still nothing out of the ordinary. Is this normal?

Will

 

This is a normal operation and nothing happened other than you pulled a vacuum line off. Be sure to put it back on again. Now if gas had come spraying out of that opening, then you would have cause for great concern. That would have indicated a ruptured diaphram in the FPR.

 

I see, how does the FPR use manifold vac? to open/close the diaghram? I would assume it would stay closed unless vac was applied to it. IM just trying to figure out how the damn thing works

Will

 

If you had a fuel pressure gage hooked up, you would have seen your psi jump from 36 to about 45.

Pulling that vacum line off will show you what your fuel pressure is at WOT.

 

Not much will happen. You'll run a little rich in open loop mode. I had mine remoed and capped for testing when I first converted to an adjustable FPR, and inadvertently drove around that way for days. No real difference, no problems, no advantages.

The vacuum diaphragm counteracts the force of the spring in the regulator to allow a lower pressure to open the disc/seat, and therefore maintain a lower fuel rail pressure. When vacuum drops, the spring pressure exhibits more pressure on the disc/seat, and fuel rail pressure is increased.

 

REALLY? Because I had a gauge hooked up the other day to measure my FP@ WOT, because of the ping. And it was way low down in the 28-29psi range.... Whats going on? Why am I losing FP @ WOT?>?>?

Will

 

If you are losing fuel pressure at WOT, the fuel system is having difficulty delivering an adequate volume of fuel. That could be from a restricted filter, fuel line, or weak fuel pump.

 

Fuel filter is brand new, the lines are all intact, that leaves only the pump, which I strongly suspect as it has recently stopped priming the lines as it should

Will