Hey Chris,

Spray that lift pump down with brake or carb cleaner to dry all the fuel off. Crank up the engine and watch it under good light to see if you can tell where it's leaking.

Probably a good time to put a new primer pump on it anyway. They're not expensive and they eliminate all that messy fuel leaking when priming the system.

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- Greg -
1973 220D, The Prodigal Benz
1974 240D