Compression Ignition Addict
Join Date: Feb 2009
Location: Nacogdoches, TX
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Oh yea. If you're in a wreck it can trip and shut off the fuel pump.
Oil should be fine for cold starts. Personally, I'd have done 10W-40. Or maybe 5W-40.
If the fuel bowl heater had shorted out, then it would've blown a#30, 30A Maxi fuse which also has the PCM Relay Coil, Ignition Coil (Gasoline only), Fuel Heater (Diesel only), Wastegate Solenoid (Diesel only), Injector Driver Module Relay Coil (Diesel only). If it blew that fuse, you wouldn't see your WTS light when you turn the key on, and the truck would crank but never ever start.
For checking codes, what are you using? These aren't OBDII systems, but CAN I think. Gotta have a good good scan tool.
To make sure the fuel pump is working, you can drain the fuel bowl and pull out your filter, and then with the filter still out, you can turn the key on engine off and the fuel bowl should start filling up.
I still think you have a GP/GPR starting issue. You say you changed the GPs and GPR. What brand? Do you know if the relay is working even though it's new?
Read those links I posted earlier. They'll help I think.
2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
330,000 + miles