Today my 83 300 td started and ran fine with the Zerostart heater it was 20*. I made it about 5 miles from my house and the fuel in the line gelled so the car stalled.. I cranked and cranked but no restart. I even got a jump start but no start. Now the glow plug light does not come on. I did not have time to check the relay fuse or test the glow plugs but does the relay fuse blow after a lot of cranking? Or could I have burned up a few glow plugs?? Thanks for any help! Thomas