Quote:
Originally Posted by BodhiBenz1987
Where does the air enter the lift pump (other than the two fittings and the primer)? Unfortunately I don't really have the kind of money now to buy a new lift pump, unless I knew it was the problem. I'll keep playing with the hose fitment for now and hopefully find something. I'll leave the sealant off the copper washer.
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Internally, the lift pump has a piston and a seal (an o-ring?) which is a potential area for air leaks if the seal/piston/cylinder wall is compromised. I agree you should not throw money at it.
I have a good used lift pump from a 83 240D if you want to borrow it. Just pay for shipping. Another thing you can try is bypass the lift pump altogether and supply fuel to the secondary filter with an elec pump, which you will have to acquire.