Ive got a 1992 D150, was driving down the road and truck just died. Went to restart and it fires then dies 2 seconds later. Got it home figuring it had to do with the fuel system. Put a gauge on it and when i cycle the key on, I have fuel pressure 40psi. I can also hear the pump run like normal for 2-3 seconds. i go to crank and once it fires the fuel pressure drops to 0psi and the truck stalls. Ive replaced the ASD relay and the Fuel pump relay. Not sure where to go from here.

only code the truck is showing are
32: EGR solenoid Circuit
51: O2 signal lean (Which i know is fine because it has an exhaust leak)

Any help would be greatly appreciated!
Thanks in advance!

 

Could be the fuel pump itself.

 

My 90 d150 did the same thing. After chasing this headache for 3 days I decided to change the computer.
In my truck the module was built into the computer. Bought one at O'Riley's for 260 something. And she's
Been running great ever since. Let me know if this helps you out. Good luck.