Sorry, I knew they didn't have glow plugs and use a grid heater, I just use it as a common term (used to all the old tractors on the farm that had glow plugs). Truck is completely stock, and once it starts it runs perfectly. I talked to my uncle (who I bought it from) and he put a lift pump in it at some point so unlikely it's that. I'll pull the solenoid off and take a look