Fuel pressure regulator location & replace
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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
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
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
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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Joined: Aug 2004
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From: Central VA
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?
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?
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
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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From: Central VA
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?
Post Fiend
Joined: Mar 2002
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From: Bonita Springs FL
The only thing the fuel pressure regulator does is increase the rail pressure when it sees less vacuum.
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FTE Legend
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From: Ottawa, Ontario
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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From: Central VA
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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Ford f150
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