Won't start
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Won't start
I just bought a 91 f150 with the straight 6 and it won't start.i changed the plugs and wires. I got it to start with carb cleaner i have 2 tanks but only one works I changed the fuel pump on it andchecked the fuel filter.it still just won't stay running any ideas on what to do next
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Joined: Aug 2018
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Can I check that or do I buy a new one
FTE Legend
Joined: Nov 2015
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From: Angier, NC
I take it this truck has EFI and if so does it have 1 or 2 or 3 if you have duel tanks fuel pumps?
Some trucks have a low psi pick up fuel pump in the tanks, duel tanks would have 1 in each tank (2 pumps), and then a high psi pump (1pump) on the frame to push it to the injectors.
Other truck I think only have the high psi pump in the tank so you would have 2 pumps total.
When you first turn the key to run before start do you hear any of the pumps run for say 5 seconds then stop? This prims the fuel system before you go and start it.
I also think there are fuel pump relays that could go bad and you should have 2 safety switches. I is run by oil psi so if the motor stops running the pumps stop pumping.
The other is a crash switch so if you get hit or hit something the switch opens and stops the pumps.
Dave ----
Some trucks have a low psi pick up fuel pump in the tanks, duel tanks would have 1 in each tank (2 pumps), and then a high psi pump (1pump) on the frame to push it to the injectors.
Other truck I think only have the high psi pump in the tank so you would have 2 pumps total.
When you first turn the key to run before start do you hear any of the pumps run for say 5 seconds then stop? This prims the fuel system before you go and start it.
I also think there are fuel pump relays that could go bad and you should have 2 safety switches. I is run by oil psi so if the motor stops running the pumps stop pumping.
The other is a crash switch so if you get hit or hit something the switch opens and stops the pumps.
Dave ----
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