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Old 07-11-2004, 11:57 PM   #1
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How can I tell if my Fuel Pressure Regulator is bad?

I'm chasing down a lean condition and want to know if there's a way for me to check and see if my Adjustable Fuel Pressure Regulator is bad.

Thanks
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316 RWHP & 335 RWTQ // 3,225 lbs with driver and fuel // 11.919 @ 113.92 All Motor
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Old 07-12-2004, 03:32 AM   #2
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When mine went bad, I couldn't lower fuel pressure below 30psi. It also drained all fuel pressure within 2 minutes of shutting the car off.

Take the hose off of the regulator, and take a sniff. If it smells like fuel, the solenoid has gone bad.

Sometimes, with the hose off, you can prime the fuel pump and see gas drip out of the nipple.
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Old 07-12-2004, 09:10 AM   #3
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So the draining of Fuel Pressure quickly is a sign then? I'll check for a fuel smell tonight.

Thanks!

Anyone else have any other signs?
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1994 Mustang GT TKO 500 5 spd
Fox 75mm TB, FTI Ported Edelbrock Perf RPM, 58cc AFR 165s, FTI Cam, 4.10s, Drag Susp, PMS Tuned by Mike Post
316 RWHP & 335 RWTQ // 3,225 lbs with driver and fuel // 11.919 @ 113.92 All Motor
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Old 07-12-2004, 09:51 AM   #4
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Yes, and those two won't necessarily both happen. Mine drained quickly, but left no fuel smell at all.
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Old 07-12-2004, 12:24 PM   #5
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Were you experiencing a lean condition when this was happening?
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1994 Mustang GT TKO 500 5 spd
Fox 75mm TB, FTI Ported Edelbrock Perf RPM, 58cc AFR 165s, FTI Cam, 4.10s, Drag Susp, PMS Tuned by Mike Post
316 RWHP & 335 RWTQ // 3,225 lbs with driver and fuel // 11.919 @ 113.92 All Motor
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Old 07-12-2004, 12:54 PM   #6
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Yeah, I would get lean pops when I let off the gas, and it'd lean backfire while cruising.

Than I put the stock FPR on it, and it went pig rich (doh!)
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Old 07-12-2004, 01:18 PM   #7
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Maybe I'll give the stock FPR on it and see what happens there... I just wish I didn't have to pay a dyno place $50+ every time I want a wide band done on my car...
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1994 Mustang GT TKO 500 5 spd
Fox 75mm TB, FTI Ported Edelbrock Perf RPM, 58cc AFR 165s, FTI Cam, 4.10s, Drag Susp, PMS Tuned by Mike Post
316 RWHP & 335 RWTQ // 3,225 lbs with driver and fuel // 11.919 @ 113.92 All Motor
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Old 07-12-2004, 11:07 PM   #8
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I looked at the AFPR and the hose doesn't smell of gas, but there is a very very light smell of fuel. It doesn't suck gas through the hose (clear hose) or leak gas when running or primed and the pressure drops to zero after about a half an hour. Does that sound like its ok??

Did you mean to say that you couldn't get it down past 30psi or 40 psi?

Thanks again!
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1994 Mustang GT TKO 500 5 spd
Fox 75mm TB, FTI Ported Edelbrock Perf RPM, 58cc AFR 165s, FTI Cam, 4.10s, Drag Susp, PMS Tuned by Mike Post
316 RWHP & 335 RWTQ // 3,225 lbs with driver and fuel // 11.919 @ 113.92 All Motor
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Old 07-13-2004, 05:43 AM   #9
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Hmmm... half an hour sounds a tad quick to me. I'm pretty sure my stock FPR will hold pressure a good amount longer.... somebody else please chime in here.

I kept backing the screw out, and it didn't go below 30psi. Finally, the screw fell out. On my previous car, I got the AFPR down to 17, no prob (that was a mistake, though. hehehe)
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Old 07-13-2004, 09:02 AM   #10
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I was thinking that a half hour sounds quick to me as well. I guess once I get my injectors back from flow testing and cleaning I'll see how long the stock FPR takes. Anyone else have an opinion of this?

Thanks again!
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1994 Mustang GT TKO 500 5 spd
Fox 75mm TB, FTI Ported Edelbrock Perf RPM, 58cc AFR 165s, FTI Cam, 4.10s, Drag Susp, PMS Tuned by Mike Post
316 RWHP & 335 RWTQ // 3,225 lbs with driver and fuel // 11.919 @ 113.92 All Motor
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Old 07-13-2004, 09:09 AM   #11
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Anyone have a stock fuel pressure reg that they wanna donate to science? or loan me since I dont want to pay 50.00 for a new one? I just bought a 94 GT that is only showing 15 psi on the fuel gauge and it doesnt raise or lower when I pull the vac hose (18" vacum - stock cam) and when I turn the car off, it drains IMMEDIATLEY..
I am in Springfield IL.. also, I have an adj regualtor for a 87-93.. I dont think that that will work on a 94/95.. right?
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Old 07-13-2004, 09:19 AM   #12
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The fittings are different for 94/95. I'd give you mine, but I don't want to sell any Fuel parts until I track down my problem, sorry. If I find my problem I'll let you know.
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1994 Mustang GT TKO 500 5 spd
Fox 75mm TB, FTI Ported Edelbrock Perf RPM, 58cc AFR 165s, FTI Cam, 4.10s, Drag Susp, PMS Tuned by Mike Post
316 RWHP & 335 RWTQ // 3,225 lbs with driver and fuel // 11.919 @ 113.92 All Motor
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Old 07-13-2004, 09:29 AM   #13
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Oh, and I just remembered another point of my AFPR, I stood next to it during one of the runs and at WOT, it was showing consistant pressure. That should mean that it is good right? If it were bad, wouldn't it be all over the place, or gradually getting weaker?

Thanks!
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1994 Mustang GT TKO 500 5 spd
Fox 75mm TB, FTI Ported Edelbrock Perf RPM, 58cc AFR 165s, FTI Cam, 4.10s, Drag Susp, PMS Tuned by Mike Post
316 RWHP & 335 RWTQ // 3,225 lbs with driver and fuel // 11.919 @ 113.92 All Motor
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