95 6.5 wont turn off when i turn the key off.

[ronnie123]

I have a 95 k2500. 4l80e. Sometimes it wont turn off when key is turned off. Engine keeps running. I have to pull the fuel pump relay to shut down the engine. Can anyone help? Suggestions?

 

[ak diesel driver]

Check the fuel shutoff selenoid on the injection pump (tall vertical cylinder on the front of the IP)

 

[bison]

I vote ignition switch,PMD gets powered with the same wire as the ESO sol.
IMO,If the PMD stays energized the engine keeps going.

 

[THEFERMANATOR]

Try unplugging the oil pressure sending unit and see if that shuts it off. The fuel pumpo relay shouldn't be energized while the engine is running on a 95 either, so it shouldn't affect anything by unplugging it.