Truck won't start....

[johnboneske]

We aren't home. At a campground and of course it isn't warm out. My truck turns over but won't start. I checked the fuel pump fuse, it's good. I tried the switch in back where the air pump switch would be on some expeditions. I thought when I pushed it, it clicked. But tried to start it and nothing. I have VERY limited tools with me. No meter, no screw drivers, do have a needle nose though.


What can I check or try? PLEASE help!!

 

[Boddkr]

Mine just started doing the same thing! It's cold where I am as well and I don't know of that has to do with it. Good luck I will follow this post and see what advice you receive

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[JExpedition07]

When you turn the key over before you crank do you hear the fuel pump pressurize? I’ll start googling around your model year.

Have someone listen under the truck for the 2-second prime. It should clearly pressurize.

 

[John Stephan]

Fuel pump control module is on the drivers side frame rail next to the spare. Very prone to corrosion and failure. Usually rot on the back side where aluminum case touches the frame. Usually finally gives up when driving in wet conditions or recent wet conditions.

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[JExpedition07]

if you have no prime Skip to 7:30, he gets it jumped out and started with minimum tools/supplies.

 

[stamp11127]

If memory serves me correctly the 2003-2004 had fuel pump relay issues in the smart junction box. There is a thread on here by bedrck47 that walks you through the steps to jump the relay in the sjb.

 

[Hamfisted]

With only needle nose pliers it's pretty tough to diagnose much. Flip the key to the ON position and see if you're getting good fuel pressure at the schrader valve on the fuel rail ( hey you can do this with your needle nose pliers ! ). If no fuel pressure try swapping the top row relays around in the fuse box. Those three across the top are the same part number so you can swap 'em around. The top right relay is the PCM relay that ties in with the fuel pump micro relay to run the fuel pump. Other than that, how's your AAA membership ?

 

[johnboneske]

I have towing with my insurance company, so if I have to I'll use them. Anyone here have a camper? Wonder what if anything my Good Sam membership covers? Its light out here now, thank God it isn't miserably cold. I will start checking a few things. I don't hear the fuel pump, but will crawl under it and have my wife then the key and see what happens.

 

[johnboneske]

I was able to get our camper home. Truck still sitting. I watched the video and did all he did, except when it came to the fuse box, I am 180° off. My fuse, and relay are good, running 12v to the green/yellow wire doesn't kick my pump on, which would mean a bad pump. Gonna order it, the best part is my gas tank is full!

 

[riphip]

Mine was having trouble in the past. Had to pull the fuse panel at passenger kick panel, take it all the way down & solder 1 leg at the backside of the circuit board that had heated & become loose. The fuel pump relay plugs into this. Take pictures of fuses before disassembly. May want to see if there are any PnP yards around to pull another.

 

[riphip]

This thread: https://www.expeditionforum.com/threads/expy-wont-crank-buzzing-sound.3436/page-2

Check this even if yours is not buzzing

 

[AftonJay]

Have you checked the module? i would check that before i start dropping the tank.

 

[johnboneske]

I checked the relay and its good... Pulled the harness off(the 4 pin behind the passenger side kick panel), and ran 12v to the wire harness at the green/yellow wire. Still won't start. So, I would "assume" since I can't bypass the fuel relay and it still won't start that it's the fuel pump. I have 12volts at the fuse, and at plug above the fuse panel.

 

[johnboneske]

Gonna pull the left rear panel inside the truck and check for power on the input and output of the fuel pump reset switch next. Hoping maybe it's bad?

 

[Hamfisted]

Do you have 12v back at the fuel pump harness ? It's attached to the frame just under the left rear passenger seat area.

Driver's side rear passenger area.... if it's the original pump, don't be shocked if it is bad.

 

[johnboneske]

Do you have 12v back at the fuel pump harness ? It's attached to the frame just under the left rear passenger seat area.

where under on the frame? Passenger or drivers side?

 

[johnboneske]

Call me if can I sent you a Pm

 

[johnboneske]

I am checking the green/yellow wire at the 2 wire harness/ where the fuel pump cut off switch is, and only have .71 volts to the harness... (Ahhh... I have to turn the key while checking it, and can't do two things at once. Will have wife help me when she gets home...)

 

[johnboneske]

There are 2 wires in the harness for the fuel pump cut off switch. A red wire and a green/yellow wire. Have only .71volts at the green/yellow wire, so I ran a wire tap into the harness to the red wire and powered it with 12 volts from the battery, tried to start it and still nothing.

 

[johnboneske]

If I back probe the harness above the fuse box. The 4 wire harness with the green/yellow wire while turning the key I get 12v. I can't check the green yellow wire at the cut off switch by myself. Will wait for my to get home from work to check that. If I have 12 volts at the green yellow wire at the fuel cut off switch, then I should be able to run a jumper wire to the red wire of that harness and that would power the fuel pump correct? And if it still doesn't start it is the pump... Just double checking to make sure I am right?

The pump is on its way, ordered it off Amazon and will be here tomorrow either way.