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The shaft on the lift pump should be spring loaded. I think the way the lift pump should be tested is:
Plug outlet and pressurize inlet with pump shaft submerged in liquid while pressing and releasing the cam to simulate operation. No bubbles should be seen.
repeat above except plug inlet and pressurize outlet
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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked
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