1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Bad Pressure Regulator Question.

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Old Jun 18, 2003 | 03:52 PM
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Default Bad Pressure Regulator Question.

If the pressure regulator is bad, I believe the fuel will leak out of the regulator. Now if I run the engine and shut it down, the fuel system is pressurized, won't the fuel that is left in the regulator leak out until gone out of regulator or should it not leak at all. I noticed that when the sytem is pressurized it leaks out a bit, but after sitting for a couple hours, I dont get any leaks. Can someone clear this up for me. Thanks
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Old Jun 18, 2003 | 05:27 PM
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Im guessing simply put, there should be no fuel running through the FPR, so any fuel coming out either way is a no no?
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Old Jun 18, 2003 | 05:43 PM
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Leaking out _where_? If you mean that it leaks out through the vacuum-line port, so it goes all over the place if you pull the vacuum line off, then the regulator is history; replace it. That leaking gas is getting snorked up into the engine'* vacuum lines, and although I _think_ it'll eventually make its way back to the intake and get burned up, it'* not doing anything any good along the way.
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Old Jun 18, 2003 | 06:01 PM
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After letting the car run a few miles, I shut off the engine and then pull the air line off the FPR. After about 30 seconds or so fuel will leak out of the FPR itself. I have tried with the engine running (taking the air line off the FPR) and reving up the engine and no fuel came out of the FPR. So what I'm trying to find out is if any fuel and I mean any, is the FPR toast (no matter how much fuel comes out).
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Old Jun 19, 2003 | 05:31 PM
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Originally Posted by 67 DSP
So what I'm trying to find out is if any fuel and I mean any, is the FPR toast (no matter how much fuel comes out).
Correct. It'* supposed to be a sealed diaphragm, with fuel on one side and vacuum on the other. If the fuel is getting through the diaphragm to the vacuum side, then the regulator is shot.
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