fuel pump
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New User
Joined: Feb 2011
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fuel pump
Hello every one Im new at this.so bare with me . i have a 92 f150 4.9L and it runs real bad .i have found that the fuel pump runs all the time and when it starts. it will not reve up and the idle hunts all the time.i have found that if i pull the ecm fuse and flsh the ecm enough times it will run the fel pump for the 8 sec. and stop scan and no codes .and the truck runs great till i shut it of and then i have to start all over again. My ? is the 8 sec cycle comes from the ecm.and do i have to rplace it.
Fleet Owner
Joined: Aug 2005
Posts: 23,666
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From: Easton,Ks
Well the fuel pump is suppose to run all the time the engine is running or cranking.
If you just turn on the key and do not start the engine then the pump should come on and run for one second and quit.
If it runs for different time periods than one second when just turn on the key then it does sound like your computer is going bad.
If you just turn on the key and do not start the engine then the pump should come on and run for one second and quit.
If it runs for different time periods than one second when just turn on the key then it does sound like your computer is going bad.
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New User
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Thanks Subford that is what i thought it was the ecm now i just have to find one .i took the cover off and water ran out of the box got rust on the coner of the ecm. on the search for a rebuild. any hints where. place in Fl. but dont have used one in the states.
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
You will not be able to get one from a Ford dealer.
But you should be able to order one from a auto part store like O'Reilly Auto Parts.
What is the number on the unit or the calibration number on the door.
With the calibration number the part number for it can be looked up.
But you should be able to order one from a auto part store like O'Reilly Auto Parts.
What is the number on the unit or the calibration number on the door.
With the calibration number the part number for it can be looked up.
