Runs for 30 to 40 minutes then shuts off. Have to wait 30 to 40 minutes for it to start up again. I have changed the fuel filter and the ignition coil. The fuel pump sounds like it is working. Any suggestions? Could it be the crankshaft sensor??
I was with gm for 24 years and if it were a guess I would say crank sensor if you know the fuel pump is ok
on some models if you can access cranksensor while its running tap it with a long screwdriver ect and if it shuts off you found it but fuel pump will act the same
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Try fixfault.com to fix vans.