Quote:
Originally Posted by BillGrissom
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Your plan to cut-off the lift pump inlet sounds possible. The suggestion that it could damage the IP by letting it run in air sounds silly. You are not letting in air, just reducing the inlet pressure. Similarly, you might bypass the mechanical lift pump and use an electric pump. There are many on ebay. I recall one for $35 says for gas or diesel, and I suspect all gas ones would survive fine in diesel.
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By deadheading the inlet of the lift pump will not damage the IP from lack of lubrication but may displace the o-ring = "piston ring" of the lift pump. It would be cool to see a video of a test.
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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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