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Fuel Problems

Tiny
HORACE DAVIS
  • MEMBER
  • FORD F-150
1992 Ford F150 with 160K+ miles, 4.9L

I have to spray gas in the throttle body to crank it and keep it running. I hear the fuel pump running when I turn on the ignition and it never stops, like it's not building up pressure. I have replaced the fuel pump, fuel filter, fuel pressure regulator, cleaned the tank and swapped out the relay with one of the other in the fuse box. Fuel seems to be getting to the rail ok. There is a lot of gas released when I push the valve. Am I missing another component that helps supply fuel to the injectors? Can all the injectors be plugged or bad at once?

I have also replaced the spark plugs, wires, distributor cap and rotor cap, so those are ok.
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Wednesday, October 24th, 2007 AT 8:48 PM

1 Reply

Tiny
BMRFIXIT
  • MECHANIC
  • 19,053 POSTS
You need to check if the injectors opening whn needed
Get a test light connect to B- and check the wire on the injector
Key on light should be on
On 1 of the wires
If not check your fuses
If ok and lights on
Switch the tester to B+
And check the other wire on the injector
This time cranking the engine light should blink.
Do you have the means to check the PCM?
And check the TPS VOLTS?
Also try to disconnect the TPS and try to start

Good luck
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Thursday, October 25th, 2007 AT 7:34 AM

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