It runs fine but once you turn off the car it requires tapping on the ppump to get it to start again (and then it runs fine). We did this cycling almost 10 times.

1. Car won't start
2. tap the pump
3. car starts (and runs fine)
4. turn off the car
5. back to #1

Is something indirectly related to the pump causing this? I would think the car could start again. Somehow turning off the car triggers something which is remedied by tapping on the pump..

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1972 450SL
1982 300D Turbo