I have 1996 f150 with 5.0 motor I moved my truck to mow the next day it would not run when turn the key on the fuel pump does not run and has no spark.I put new dist. in still no spark there is power to dist and coil there are 2 relays next to power box under hood the #1 relay powers up but the #2 relay does not.All fuses are good all wirring looks good I even put new pcm in but still will not run no spark or fuel action.In the power box in the# 2 slot is fuel pump relay owners manual I take my power probe and I can make the pump run.all the relays have power all the time just like it is suposed to I was vw tech for 27 years but not sure whats wrong with my truck thought I could fix it.Help

 

Did you check the fusable wires coming from the starter solenoid? Years ago my plow truck, 86 Bronco did the same thing, I just wired a 15 amp fuse in, the place of the blown fuse link.

 

Did you check the impact switch? This shuts off the fuel pump(s) in the event of a collision.

Not sure on your truck but I think it's behind the dash near the hump where the carpet meets the firewall on the passenger side, should have a white or red button on top.

 

I checked the switch it seems ok but theres no power going to it

 

I,m not sure were they are I looked for them but unable find them

 

Rollver switch gets power from fuel pump relay. If there is no power at the rollover switch, check the relay. Should have power (red wire?) in, and when ECM grounds the control wire (color?) the relay closes and sends power to the pump via rollover switch. ECM turns relay on for about one second at Key On, then shuts it off until it sees rpm signal from dist. A test light from battery pos to relay control terminal will confirm that.

 

the relay has power on terminal 30 but there is no power to activate relay

 

For some strange reason the truck runs again the only thing that was done is swap eec relay and fuel pump relay they were both good so I don't know what happened.

 

Inertia switch is a possible solution for the fuel pumps not turning on, but wouldn't explain the lack of spark. If the PCM has already been replaced, to no avail, then I would consider doing a point to point continuity check on the main engine harness coming off of the PCM. Pain in the butt, but sounds like it could be you're problem.

 

sounds like a stuck relay, could have been jostled loose while switching them. Have you checked connections going into the battery distribution box?

 

is the CEL on? Can you pull the codes? I'm interested to know if it throws a 542 code, or not.

 

This truck has no codes stored

 

i had a very similar problem about a month ago it was a poor connection into my relay cleaned all the contacts and and pinched a few connectors and now she runs like a champ no problem (except for needing a water pump)

 

1995 f150 changed two push rods that were not in rocker .so got all of them done and now put manifold on to check pushrods and rockers. To make sure there working all and did .so put valve cover pan on and manifold back together .notice a high idle and a rasberry sound coming from someware by an the alternator .didn't make that fast idle when the valve cover was off...