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Old 09-07-2007, 02:15 AM
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Join Date: Nov 2004
Location: N Central Alberta
Posts: 1,006
Make: 1986 Pontiac
Model: Fiero 2M4 Coupe
Engine: 1991 Quad 4 H.O.
Fuel pressure regulator problem?

Has anybody had a problem of their fuel pressure regulator sticking? I think mine is sticking, or at least slow.

I noticed one day that my fuel pump (which is between the seats under the console on a Fiero, therefore easy to hear), was 2X louder than normal when I pulled into the A&W, I turned the engine off, then turned the ignition back on, and the pump was still noisy. I went in, had a burger, and when I came back out, it was still noisy. It drove fine and everything, but I noticed that the pump didnt change note like it usually does. Usually the pump goes quiet on deceleration, and gets louder as load increases which is normal from what I know, but this time it was the same noise, didnt get louder or quieter even while decelerating from 4000RPM in gear. I parked it, and the next day, the pump was quiet again, but I only drove it around the block to park infront of my house, that was 6 days ago. I drove it again today, and it worked fine, but I did notice that it takes awhile for the pump to go quiet after I let my foot off the gas when in gear, and again takes awhile to get noisy when I accelerate from a decel mode, by awhile, I mean like 5 seconds.

Is this normal, or is my fuel pressure regulator sticking? I assumed the fuel pump was noisy that one day because the regulator was stuck in a position that made my pump put out max pressure. No fuel comes out of the vac hole, but when I was sucking on the vac port on the regulator with the engine off, it did smell alittle like fuel.

I am going to replace it with another one I have laying around. Oh BTW, I have the newer style regulator with the vac port coming out the top, not the side.
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1986 Pontiac Fiero 2M4, with a 1991 Quad 4 HO/5-speed engine.
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Old 02-28-2008, 02:40 AM
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Join Date: Mar 2005
Location: St. Louis, MO & Elgin, IL.
Posts: 74
Make: 1995 Pontiac
Model: Grand Am Se
Engine: 2.3L Quad 4
I know this is old. Real old. But this sounds like my problem except for my car has trouble starting as well. Did this take care of the noisy fuel pump?
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Old 02-29-2008, 02:00 AM
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Join Date: Nov 2004
Location: N Central Alberta
Posts: 1,006
Make: 1986 Pontiac
Model: Fiero 2M4 Coupe
Engine: 1991 Quad 4 H.O.
No, I found out I may have the wrong fuel pump installed, due to a listing error in the computer.
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