Sorry, need to clarify previous post on this....
Truck will not restart after it gets warm. However it wil restart after 45 minutes. Taken to dealer, all systems check out fine,electrical,fuel,charging,antitheft, no codes appear. All lights are bright, radio works fine, and it will crank and crank but will not turnover!!! Again, if I wait 45 mninutes or so it will turnover and run great! I love this old truck it has 150K on it and has been terrific!
The Ford F-150 forums are all over the map!
This is an example of the exchanges on this vehicle I have run across on the webb>>>>>>>>>>>>>>>>>>>>>>>>>>>
(eallanboggs: Thanks for the tips on changing the pump. My truck does not have the COPs, so I will pursue spark, fuel, air for cylinder #8...
The truck finally decided to refusing starting again. I took the following voltage measurements, when the truck would crank, but not start:
- Battery voltage, 12.6V (no load)
- Fuel pump, 10V for 1 sec , then 0V (w/ key on, but not cranking)
- Fuel pump, 9V (w/ engine cranking)
- Inertia switch, 11V for 1 sec, then 0V (w/ key on and inertia switch in normal operating position)
- Inertia switch, 11V for 1 sec, then 6.75V (w/ key on and inertia switch in triggered position)
With Crank position sensor unhooked:
- Fuel pump, 11V for 1 sec, then 0V (w/ key on, but not cranking)
- Fuel pump, 0V (w/ engine cranking)
Note: The fuel pressure remained 0 during these measurements, and the truck would not start.
Then, I installed my battery charger and reinstalled the crank position sensor:
- Battery voltage, 14.6V (no load)
- Fuel pump, 13V for 1 sec, then 0 (w/ key on, but not cranking)
- Fuel pump, 10-11V (w/ engine cranking)
And, the fuel pressure rose to ~30, and the engine cranked & started.
My next steps are to a.) have my new battery load tested, since the fuel pump only had 9V while cranking without the aid of the battery charger, and b.) change the fuel pump, since it works with high enough voltage
Does anyone know the voltage spec. for a fuel pump? Should it work with 9V?
Any other suggestions? )
PLEASE help! There has got to be someone out there who has seen this. Your advice is greatly appreciated! Thanks very much! We look forward to your suggesstions. Have a great weekend!