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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 09-09-2009, 02:07 PM
matpasch matpasch is offline
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Fuel pressure regulator location & replace

My 1993 f250 with a 351, 5spd ext cab 4x4 is still getting bad milage(around10 mpg) after full tune up, besides fuel filter haven't replaced yet, so I wanted to test and or just replace my fuel pressure regulator.
Where abouts is it located and any tricks to removing it, besides, I guess, de-pressurizing the fuel system by tripping the inertia switch and letting motor run till empty???
Thanks mat
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Old 09-09-2009, 02:22 PM
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Conanski Conanski is offline
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FPR is located at the back of the motor on the drivers side on top of the fuel rail. Unfortunately it is attached with 3 allen head bolts from underneath which are difficult to access on an assembled motor... to put it mildly. In ths pic the FPR is to the right near the firewall just above the coil with a red vacuum line going to it. You can also see a gauge just above the oil fill, that gauge is attached to the shrader valve on the fuel rail.

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1990 5.0HO AOD XLT X-Cab F150 3.55LS, 1994 3.0L 5-sp x-cab Ranger 3.45, 2004 3.0L 5-sp X-cab Ranger Edge 4.10, 2004 2.5L 5-spd Subaru Legacy
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Old 09-10-2009, 09:28 AM
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Would the fuel pressure regulator make any noise while doing its job?

I have a 95 F-150 5.0 that will crank but not start. I can hear the fuel pump run when I turn the key to Acc. The past few days I drove it, I cranked it 5 or 6 times and it started, then I was able to drive it the rest of the day without trouble. It always seems to be the first start of the day.

Today I had the problem again, checked the inertia cutoff switch, popped the hood to check the 20A fuse for the fuel pump, both seemed fine. After trying to crank the truck again I left the ignition on, then went back to the engine to look around. I heard a little whirring sound from the driver's side of the engine compartment. So I turned the key and it started right up. Coincidence? What might the whirring sound have been?
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Old 09-10-2009, 09:33 AM
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There are several solenoids in the engine bay that make various noises when energized but the FPR doesnt make any noise. You may have dirty fuel injectors that are leaking and making it difficult for the pump to build pressure at startup. You can confirm this by attaching a gauge to see if the rail holds pressure and if it doesn't run some cleaner through the fuel system, have the injectors professionally cleaned, or replace them.
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1990 5.0HO AOD XLT X-Cab F150 3.55LS, 1994 3.0L 5-sp x-cab Ranger 3.45, 2004 3.0L 5-sp X-cab Ranger Edge 4.10, 2004 2.5L 5-spd Subaru Legacy
1996 Kawasaki ZX11D, 2004 Honda 599, 2008 Kawasaki KLR650
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Old 09-10-2009, 09:44 AM
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I ordered a pressure gauge today, figured that would be a good place to start along with a fuel filter for good measure.
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Old 09-10-2009, 11:14 AM
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Another thought...the noise I heard in the engine bay could have been the fuel pump running at the back of the truck. Which brings me back to the regulator. Does it allow the fuel pump to run directly or indirectly, and could that be happening while the ignition is on but truck isn't running?
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Old 09-10-2009, 11:33 AM
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The only thing the fuel pressure regulator does is increase the rail pressure when it sees less vacuum.
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Old 09-10-2009, 11:43 AM
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Adding to what Andy said... the FPR is not controlled by the computer or any other device it's just a dumb vacuum sensitive valve. If however your fuel pumps are running constantly when the key is on but engine off then you have another problem, either a stuck pump relay or bad EEC.
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1990 5.0HO AOD XLT X-Cab F150 3.55LS, 1994 3.0L 5-sp x-cab Ranger 3.45, 2004 3.0L 5-sp X-cab Ranger Edge 4.10, 2004 2.5L 5-spd Subaru Legacy
1996 Kawasaki ZX11D, 2004 Honda 599, 2008 Kawasaki KLR650
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Old 09-10-2009, 12:00 PM
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The fuel pump isn't running constantly, I hear it running when I turn the key and it stops in a second or so. Then while under the hood with the ignition on I heard a quiet whirring sound, I then tried to start the truck again and it started right up.
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Old 09-10-2009, 12:11 PM
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I don't know what the whirring noise was, but it didn't have anything to do with the fuel system.
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Old 06-30-2010, 01:07 PM
Matthew Martin Matthew Martin is offline
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misfiring

My 96 f-150 is misfiring. I have replaced the fuel pump and four of the fuel injectors. So my question is is if the fuel pressure regulator make the truck misfire while I am driving?
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Old 06-30-2010, 02:39 PM
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A misfire is usually electrical. Pull the codes first and if that comes up all clear test and/or replace the high voltage ignition components.. aka.. plugs, wires, and coil.
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1990 5.0HO AOD XLT X-Cab F150 3.55LS, 1994 3.0L 5-sp x-cab Ranger 3.45, 2004 3.0L 5-sp X-cab Ranger Edge 4.10, 2004 2.5L 5-spd Subaru Legacy
1996 Kawasaki ZX11D, 2004 Honda 599, 2008 Kawasaki KLR650
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Old 12-07-2012, 09:31 AM
keoghzayd keoghzayd is offline
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Ford f150

Quote:
Originally Posted by dan1101 View Post
The fuel pump isn't running constantly, I hear it running when I turn the key and it stops in a second or so. Then while under the hood with the ignition on I heard a quiet whirring sound, I then tried to start the truck again and it started right up.
Hey i wasn't sure how to reach you directly so ill ask it on here, have you figured out your problem? my truck is doing the exact same thing, please email me if possible its ryanhilgeman@yahoo.com, it usually does it after sitting for periods of time and it can take anywhere from 5min to and hour before i hear that second sound engage i assumed it was pump also. I have dual tanks tho and it doesn't matter what tank i have it on it will not start until i hear that pump engage for the second time, ive replaced fuel relay, fuel filter. So any help would be greatly appreciated its driving me insane, took it to mechanic and of course it wouldn't do it for him, my pressure was to spec as well.
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Old 12-07-2012, 09:31 AM
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