Should anything happen if you disconnect the vac line to FPR?
05-23-2004, 10:00 PM
#1
Should anything happen if you disconnect the vac line to FPR?
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
Will
05-23-2004, 10:14 PM
#2
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Car: 1989 Iroc-Z
Engine: 5.7L TPI
Transmission: 700R4
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.
05-23-2004, 10:43 PM
#4
Moderator
Re: Should anything happen if you disconnect the vac line to FPR?
Originally posted by norcalz28
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
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
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.
Last edited by IROCThe5.7L; 05-23-2004 at 10:45 PM.
05-23-2004, 11:18 PM
#5
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.
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.
05-24-2004, 02:01 AM
#7
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.
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