I just bought a 79 300D with 116,000 miles on it from an older gentleman. The car had been sitting for about 6mo and so I towed it home thinking it needed a battery charge or at the most new glow plugs.
Well here is what I have done....
replaced glow plugs
replaced glow plug relay
charged battery to 100%
primed fuel pump (cracked injectors til fuel came out)
tried Kent's trick of putting STP/Oil mixture into the injectors
...Still nothing
I am only getting a reading of 8 voltz at the glow plug fuse, the car cranks well but just won't fire. I am out of ideas....any thoughts?