First Let me say that I appreciate all the info I have gleaned from this site. It has helped me a lot with both my 2003 Lightning and 2007 4X4 F150 5.4 triton. Now to the problem I am having. AC went out so I changed all AC components (compressor,condensor, accumulator). Flushed and vacuumed system down and went to restart truck to charge AC system, it would turn over but wouldn't fire up. Also when you turn the key you don't hear the fuel system pressurizing. I believe I have either bumped or broke a vacuum line off when installing the AC parts or a electrical plug/ sensor for the fuel system. Could use a schematic of the Vac system or if someone has a specific place to look. I have checked everything I can reach and see, I'm just not looking forward to taking things apart again if I don't need to. I did have to remove the battery and the computer to get the accumulator changed. Thanks in advance for any help.
Mark

 

Have you checked the fuel pump driver module above the spare tire?

 

No I haven't, is it able to be reset? It was replaced about 1 year ago.
Thanks
Mark

 

No, I just assumed your FPDM had failed at the same time, from excessive corrosion. There is a fuel cutoff switch in the fuse box. Check that (usually that cuts off from a heavy jolt to the vehicle, such as an accident.)

Also, did you check any fuses?

 

Fixed. Started checking all plugs because I had fuel pressure and found that I had bent the pin on the crank position sensor plug that is right by the compressor. Straightened pin and plugged back in truck started right up! Thanks for the suggestion.
Mark

 

Sweet... glad she's running again..