OK a couple months ago I bought this 1995 6.5 turbo diesel it has 240k miles and it was OK at first now I'm having problems. When starting after the truck has set all night I can crank it and everything is fine I can drive it but it has a little bit of an inconsistent sputter for awhile. But and but will stay running but if I go somewhere go inside and park it for like 30 or more minutes when I go to get back in and crank it it will crank run for about 10 secs and shut off and won't start up until I try cranking it for bout 20 seconds while pumping the gas. Now if the truck is only off for 5-10 minutes it will start fine. I have already put 3 different pmds on it please help me out really struggling


All I have done is relocated PMS and changed lift pump please help

 

when you do get it started check the power at the lift pump aka transfer pump, there is a circuit in the oil pressure sender that controls the power to the transfer pump and the circuit fails quite often. Your best bet is to run a bypass from an accessory power source to the transfer pump. also check your fuel shut off solenoid

 

If the LP does not operate when the engine runs-it can be the oil pressure switch that is the cause,but running direct power to it removes a safety feature that prevent's you or someone else from getting BBQ'd in an accident.

The best repair is replace the OPS with AC Delco ONLY and google OPS relay mod and install or use this diagram for OPS relay mod:
https://www.dieselbombers.com/chevy-...ime-cycle.html

the lower relay shown is the mod-I drew the whole circuit to show why my previous diagram had problems,very busy diagram but it will work as shown.