Drove truck about 60 miles and ran fine. pulled in the front yard & shut it off to unload. Would not start again. Towed it to side yard to get it out of the way & let it set for a couple days. Fired right up after two days setting. Ran again for about 15 miles and parked it again for a week. Son-in-law came to borrow it and started right up and ran for only a couple minutes and died. Would not start. Crank all you want. NO START. Tried today and no start again. Checked for fuel, pumps fine after the filter. Checked fuel shut off and it does click, so I'm assuming it works OK. Glow plugs seem to be working also. Still won't start. Ignition key's been on for pobly 10 minutes now so glow plug circuit isn't activated any more and give it a shot of starting fluid.Fired right up after a bit of cranking. Died a couple minutes later and won't start again. Another couple mins give it a shot of starter fluid and runs fine for a couple mins again. Seems to run OK when it's running but just dies after a few minutes of running and will only start with starter fluid. Trucks fully warmed up to. Please don't tell me it's injector pump. It looks like A LOT of fun to replace.