My 6th Lift Pump

pos said:

Fixed

I whipped the lift pump off the block yesterday expecting to find that the cam lever had sheared away from the diaphragm pin but as I was slackening the two fixing bolts, the pump launched diesel at my bonnet. Hmmm... That can't be to bad then! I took the pump off completely and proceeded to manually pump it by hand. Everything seemed in order. I re-installed the pump to the block, tightened everything back up and it failed to pump, although the engine would run, so fuel was certainly being drawn up by the injection pump. I whipped the pump off for a second time and then tested its ability to hold vacuum and to pump in comparison to a new pump using a pressure gauge - both were relatively similar. Put it back on just to try it one last time before going insane and thought thay I might as well blow some air down the fuel lines.... Problem fixed! So after all that buggering about, it was just a blockage along the line from the tank. Suppose I'd better give my tank a good clean out. It's only been on three years but it's full of ****e. Fingers crossed this pump won't pack in in the same way the last ones have.

-Tom

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discomania said:

I've had many good years service from a Delphi pump, identical to the one you show.

Although your local guy only gets them in as he needs them, who's to say his supplier (or even the suppliers supplier) doesn't have a box of 20 sitting on his shelf and your getting the same batch each time, even over a long period? If you reckon the pumps are fine then you need to look at the situation.

It could be the pump maybe being over actuated, why I cannot be sure, and the Delphi design is such that it cannot cope, the others may have a fractionally longer pin on the diaphragm etc.

If the engine is run at high revs the cam lever will actually continue to travel up even once the cam is starting to drop, then it will slam down on the cam, this can lead to the early failure. Do you run it at high revs a lot? Do you change gears late?

When you mount the new one, push it up as high as you can get it to sit, so that the arm is not being pushed to near the full extent of its travel.

Or, fit an electric pump!

Benefits here, including increased security as you can immobolise the engine by hiding the pump connections away and making it difficult to rearrange the wiring quickly to bypass the ignition.

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pos said:

I never had a problem with the original LR lift pump that was fitted to my 2.5 N/A and it was a rusty, manky looking thing that I expect was probably the original unit. I will see how well this pump lasts and if it decides to fail just like the others have, I am going to go down the electric pump route. The gaylander TD4 electric fuel pump is supposed to be a good alternative to the mechanical lift pump but so are Facet pumps. That's what I love about these machines.... Flexibility as for my revs, I do give it some stick occasionally but most of the time I just plod along.

-Tom

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iguana said:

How do you know when your lift pump fails , does the engine start spluttering and stop ?

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