2003 no start stalled on interstate

[Sportfury70]

Got stranded last weekend, my dad has to come tow me with his Chevy (8.1/Allison) so that was embarrassing.

Truck still won’t start. Did fca plug test that indicated a bad lift pump (in-tank retrofit) so I ordered a new pump. Installed and still no start. With fca plugged in, pump only runs for a second. Fca unplugged the lift pump doesn’t even run. I cleared the codes, but it had the dreaded P0251 when it died.

What do you guys think? Bad fca? Cascade valve stuck open? CP3 poo the bed? ECM??

A little background, truck is stock, 6spd 4X4. Driving down to VA from NH. Truck bucks a few times outside of DC and then just stalls. No start condition since then.

I’m borrowing my dad’s truck while I’m in town, but I need my truck back up. Help!!

 

[p-Bar]

open up the drain for the water trap and see if the pump runs

 

[p-Bar]

I have the retro done to mine too . There is a relay on the firewall drivers side

 

[Sportfury70]

There is no fuel running from the filter bowl with key on , and switching relays (parking lamp #73) from the fuse box to the retrofit makes no difference. Hoping the fca is shot and installing a new one works. Wish there was a local guy here I could swap fca’s with to verify, but no go so far. Anyone in the Hampton roads area lurking?

 

[Sportfury70]

Anyone know if the fca can kill the DC voltage to the pump? Or is it the ECM that sends the signal? The way it stalled hinted fuel starvation...

 

[Sportfury70]

With the fca plugged in, the pump runs for one second, then shuts off.

 

[Sportfury70]

There was a short in the harness behind the inner fender well. Crimped a connector on and now I’m back in business. Someone else on here had the same issue, thank god I found his post after searching.

 

[p-Bar]

excellent sorry we were of no help . We will put this one in the memory bank.

 

[Sportfury70]

Yeah it was just trial and error. Thanks for the attempt anyway, I’m just glad its running.