Symptoms of FPR Failure - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 12-11-2004, 05:45 PM   #1
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Default Symptoms of FPR Failure

I was wondering if we could make a post here of people who have replaced bad fuel pressure regulators, either because theirs was shot, or they felt it was in the process of dying. I would really like to see the symptoms that people experienced as they went down the road of FPR-failuredome.
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Old 12-11-2004, 05:47 PM   #2
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Bogging during acceleration
Loping idle
Hard to start

All getting worse over time.
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Old 12-11-2004, 05:51 PM   #3
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I replaced it twice in my 90. The most prevalent symptom was intermittent difficulty starting. The first start of the day usually took 2, and in some rare condition 3 cranks to start. It worked well for about 2 weeks and went back to it'* old habits. Rather than suspecting a different problem, I went back to the parts store and asked them to warranty the first.

It has been fine ever since. I havent really driven since 10/15 but do start it up about once a week. Fires right up.
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Old 12-11-2004, 06:41 PM   #4
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Awww Randy, give some attention to the classic :(. She'* probably sad.

Don't they leak sometimes too? Or am I crazy?


-justin
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Old 12-11-2004, 06:52 PM   #5
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Quote:
Originally Posted by opensourceguy
Awww Randy, give some attention to the classic :(. She'* probably sad.

Don't they leak sometimes too? Or am I crazy?


-justin
Most of them leak internally, Hence causing the low FP and hard starts.
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Old 12-11-2004, 07:04 PM   #6
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I have a bad FPR on my bonne....It'll fire right up cold. But when it'* warm and you go to restart it after about 5-10 min....You'll have to crank on it for like 20 secs before it'll even cough. I also have the really loping idle right now....Sounds like my car has a really radical grind on the cam lol. What happens with mine is that it leaks the raw fuel and bleeds the pressure into my intake....Which in turn after 5-10 min it becomes flooded...And becomes a pain to start. Also another symptom that kinda goes with the hard start is the very rich smell of raw fuel in the cabin. Just my problems...And my theory on how it all works.
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Old 12-11-2004, 09:09 PM   #7
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Hmm.. I also thought they may leak externally, too. But hey, my FPR works great .


-justin
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Old 12-11-2004, 11:21 PM   #8
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The FPR has a diaphram in it with fuel pressure on one side and engine vacuum on the other. A leaky disphram will usually not hurt cold starts as mentioned. It will simply richen the mixture wich will aid in cold starts but make hot starts very difficult. Somewhat like a choke that is not disengaged. Poor fuel milage is another symptom as unmetered fuel is being sucked into the manifold, again as previously mentioned. If you suspect it is bad, just pull the vacuum hose off of it and look for fuel leaking out of the nipple. There should be none. They usually don't leak externally when they fail. Generaly it'* the diaphram that goes bad.
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Old 12-12-2004, 03:24 AM   #9
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Just replaced mine....starts within a second now...instead of the usual 3 or 4...seems to idle and run smoother...
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