Son has a 1981 300SD that cranks but will not start. We have checked the fuel lines, changed filters, primed, checked glow plugs, glow plug wires, fuel comes out of injector pump, comes out of the fuel lines at the injectors, we drained the tank and checked the screen at the bottom of the tank. Replaced the starter that was drawing 300 rather than the 190 that was recomended. New battery, checked the relay switches, tried starter fluid. The car ran when it was parked after being in Green Bay for several weeks so it made the 8 hour trip just fine a year ago last fall so it sat for 18 months and now cranks over occasionally sounds like it wants to start but does not follow through. thanks
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