Starting problem

1990 XJ 4.5 lift 31's 4.0 Inline Six

Driving down the road one day car died...wouldn't start up even with a jump
have checked fuel lines, replaces spark plugs and wires, still didn't work...
replaced ignition switch on top of steering column , now it starts up however when key goes back to run position it dies imediately......trying to get any help nescessary!
triyng not to spend to much but am willing if i need to
Am on subase bangor if anyone wants to help or take a peak at it
-MUDDYMOPAR-

Sounds like the balast resister for the fuel pump failed. Look for a white thing, half inch by like four inches, along the driverside fender. Just jump the wires from both sides together, it's not necessary and was deleted with HO's.

appreciate the help i'll try that

k tried the jumper and didn't do anything....anybody have any other ideas

When it dies returning to RUN from START, does it stumble or just cut out (as if you had switched to OFF)?