Originally Posted by c_hasbeen
1995 thomas re with a 8.3 cummins engine, I crank the engine over and she fires off imediatly, let go of the key and she dies. hold the key and she stays running until I let off the key.
It is dark out now so I have to get a closer look tomorrow after work, but to me this sounds like maybe a fuel shut off solenoid/ or a relay? breaker? fuse?
I tried to use the rear start button and it did not work, but I have never tried it before so I am not sure if that is related.
Tomorrow I may try and get someone to turn the key over while I watch the pump solenoid.
any ideas anyone?
I had something similarly quirky happen on a 1996 lincoln town car limousine.
Start the car normally, everything worked!
Turn off ignition and all electrical shut off, but engine kept running...
it would not die until I pulled the "drivetrain" fuse under the hood...
But get this, you could leave the fuse out, and car would start and have all electrical. But it would die at the most inopportune moment.
Electrical engineer wired a relay to the "normal on" wire under dash out to solenoid on fender under hood.
Chased that gremlin for months!
with you having the key twisted to the furthest right, you are closing contacts.... release the key and you are opening contacts.