Fuel Pumps continue to run

ARROWMAN

MEMBER
1990 FORD F-150
6 CYL
2WD
MANUAL
110,000 MILES

When you turn the key on the fuel pump stays running, no matter which tank you switch on and the truck turns over fine but will not crank up. And right before it quit runnung completely, It had a very high idle. Have replaced the tank selector switch, fuel pressure regulator, fuel pump relay, ignition module, idle air module and key switch in steering column. What else could be the problem? Is this one of the signs when the ecm is bad?

Thursday, September 11th, 2008 AT 4:36 PM

1 Reply

MERLIN2021

MECHANIC
17,250 POSTS

Have you scanned this truck for codes?

Gounds the fuel pump test connector and turn key on. Then test the system after you finish the pump test. You want to see if it runs and the pump works normaly.
Do this and count the flashes...Count the flashes, a 22 will flash as 2 flashes then a short pause, then 2 flashes, if more than one code is stored, the pause will be longer. The codes will display three times and end with 11 or 111. Write them down and post here. First do this with the ke on engine off, then again with it running.

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Thursday, September 11th, 2008 AT 5:02 PM