I recently bought a 1983-300SD that had been sitting since 1996. I removed the canister filter and filled it with half gasoline and fresh diesel fuel... Used a good charged battery.. started iin about 5 minutes.. smoked and then ran like a top... I pumped the brakes gently and slowly moved the car back and forth and pumped the brakes... then I drove the car 35 miles home... The valve might be out of adjustment but the engine should start... I didn't try to bleed the air either... I am going to do a brake job next... work on the front suspension and paint... good luck... Jim

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James A. Harris