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1990 7.4 runs great then shuts off. Joe Walker 4-2-13  
I have a 1990 RV with a 7.4 that runs great. (When it runs) I've taken it to severial differant mech's to work on it but they can't figure it out. It starts and runs good. Out of no where it just shuts off. I can pump the gas a few times and it will fire right up. It may run for 5 minutes or 30 minutes than just shut off. I've changed the fuel pump in the tank and other things with no progress. Any ideas?????
Re: 1990 7.4 runs great then shuts off. BUBBA THE BUS TECH 4-3-13  
I can't remember how your ignition is set up but it really sounds like the ignition module is bad.

If I am correct it will only test bad whenb the engine quits. So it is impossible to diagnose.

The other common failures tend to be cap rotor and coil.

Good Luck
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