Fuel pressure regulator?
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5th Wheeling
Joined: Jul 2013
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Fuel pressure regulator?
I have a '92 F150 5.0. Recently it ran great cold but after an extended run time acted as if starving for fuel under load. A couple of times it has died at a stop sign, restarted after a few minutes, and maintained its symptom. Last week it died and did not restart. Ignition tester says it's getting fire at the plugs. Recent parts replacements have been an ICM and fuel tank selector switch. I've jumped the test plug and I hear the fuel pump run. I'm running out of ideas. Anyone? Thanks in advance.
Fleet Owner
Joined: Oct 2005
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From: Kentucky
Run the Key On Engine Off (KOEO) tests and Stored Code (CM) display. List any codes by number and during which portion of the testing they were displayed. Check the fuel pressure at idle, at idle with the vacuum line removed from the fuel pressure regulator and again under load.
Fleet Owner
Joined: Oct 2005
Posts: 20,786
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From: Kentucky
When was it displayed? KOEO or Stored Codes. That one can also be a Key On Engine Running (KOER) code.
Code 34 (KOEO/KOER): EVP circuit above the closed limit of 0.67 volts
Code 34 (CM): EVP circuit has intermittently failed above the closed limit of 0.67 volts.
If the EGR valve is not fully closed it can cause a lean condition. Probably not the cause of your issue. But something to resolve later.
At this point I would suspect this is a fuel issue. Does the truck have two tanks? If so, does this happen when using both?
Code 34 (KOEO/KOER): EVP circuit above the closed limit of 0.67 volts
Code 34 (CM): EVP circuit has intermittently failed above the closed limit of 0.67 volts.
If the EGR valve is not fully closed it can cause a lean condition. Probably not the cause of your issue. But something to resolve later.
At this point I would suspect this is a fuel issue. Does the truck have two tanks? If so, does this happen when using both?
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5th Wheeling
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Thus far I've only used the rear tank. When I replaced the tank switch I tried the front tank. The fuel gauge pegged beyond full and the engine died immediately. Put it back on the rear tank and it ran. Unable to do a Key On, Engine Running when it won't start. Engine spins over as normal, just won't start. (??)
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5th Wheeling
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The CEL comes on when I turn the switch on and goes out shortly thereafter about the same time the fuel pump builds pressure and shuts off.
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Fleet Owner
Joined: Oct 2005
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From: Kentucky
Looks like the computer has not failed with some of the common modes. Now you are back to fuel. Since you state you are getting spark you could try spraying some fuel or starter fluid in the intake then crank it over. If it fires up then you know it's fuel related. Then you need to check fuel pressure.
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