92 starting problems

[sictruck]

I recently purchased a 92xj with a blown motor so i put in a motor from a 1998 and used the 92 head. so my xj will start first thing in the morning but after it warms up and i turn it off it will not fire back up, just crank, and cranks. I have changed the crank sensor, coil, cap, wire, plugs, and I'm getting 30-40psi of fuel at the rail, and i do get spark. so what would cause it not to start once its warmed up?

 

[8Mud]

I usually listen to the injectors, if you have good ears, you can hear them clack (cycle). Or use a piece of pipe. If the injectors aren´t cycling, it can be various problems, usually sensor related.
I had an 87, where the fuel line, was too close to the exhaust manifold, when it got hot, I´d get a vapor lock. Seem to remember a heat shield on the fuel line for the OBD 1 motors.
Have you done a leak down test on the fuel rail? If it leaks down to "0" it´s possible to get some air in the fuel rail.

 

[sictruck]

the injectors definately work. and for vapor lock i know its not doing that. I also checked for fuel leaks and found nothing. thank any other suggestions.