Sometimes the vacuum in the engine shut of system doesn't evacuate fast enough when you turn the the key to start the car.
Specially when the engine is hot and you don't have to pre glow.

Turn the ignition on and wait a few seconds, then start the engine.

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76 240 D. Bought in 1998 for $25.
85 300D. Got it for free with a bad engine. ( Sold )
60 Unimog 404. What was left of it, was given to me. Now powerd by 617A.
88 560 SEL. Bought without engine and trans. Now powerd by 617A.
67 250 SE. Cuope. For resto or sale.
64 220SE. For resto.