Ok I have a 1988 f350 7.3 idi and it won't start. I've changed the mechanical lift pump, the injection pump and the relay on passenger side fender(ideas corroded bad). I changed the the relay and wiring harness for the relay and it hasn't tried to start since. I've changed all the other stuff because I figured it was workout. Can I get an ideas what I need to be checking? Thanks

 

Fuel solenoid or lack of fuel supply ... Are your Gp's heating up ?

 

Check the fuse for the fuel relay.