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ray840
ray840

Posted: Tue Mar 09, 2010 5:28pm

Post Subject: diesel lift pump on BMC1.5 engine

Hi Tony, yet more advice please. Recently I have noticed, when checking the oil level that the oil level has been rising on the dip stick. My first thoughts were that the cylinder head gasket had gone , allowing water into the oil sump but there is no sign of any emmulsifying whatsoever on the oil filler cap or in the rocker compartment. After talking to people who know a lot more than I do about diesel engines I have been told that in the first instance it is probably the fuel lift pump that is seeping and this is the place to start. Could you please advise if you agree with this diagnosis and also what is involved in fitting a new lift pump, bearing in mind that I am not particularly mechanically minded. OK at changing oil and filters. Regards, Ray.

Tony-B
Tony-B

Posted: Tue Mar 09, 2010 5:50pm

Post Subject: diesel lift pump on BMC1.5 engine

Dear Ray, actually I would not necessarily agree with the. Lift pumps can cause fuel dilution when the diaphragm splits but the original design of the pump had a small drain/breather hole in its lower portion so that any fuel leaking out of a split diaphragm would leak out and you would see a fuel stain or, more likely, a clean streak running down the outside of the engine. However If that hole is missing a punctured diaphragm would dilute the sump oil. The other place it can leak from is from around the drive shaft seal on the injector pump but that is a professional repair. To test the lift pump remove both the inlet and outlet pipes (note - it can be difficult to put the threads back in the pump without cross threading them). Put a finger over the inlet port and operate the pump. Vacuum should build up and hold for several minutes after you stop pumping. Do the same with the outlet, but this time it should produce and hold pressure. If you can not get pressure or vacuum then it is an indication that the p[ump may be faulty but it could be a faulty valve or a small pinhole may not show up. Before working on the pump remember to turn the fuel tap off - an don again before you try to bleed the system. Changing the lift pump is not difficult as long as you observe two precautions. First of all, when you fit the new pump make sure you slide the hookey bit that goes inside the engine up the inner face of the engine block. This avoids getting it on the wrong side of the camshaft which is easy to do. Secondly only start the nuts or bolts that hold the pump onto the block and them while you can still waggle the pump about, fit the pipes. You will the have to bleed the system. Tony Brooks

ray840
ray840

Posted: Thu May 13, 2010 4:04pm

Post Subject: diesel lift pump on BMC1.5 engine

Just for info Tony, I have now fitted a new lift pump and after doing a couple of days cruising it seems to have cured the problem. No difficulties encountered in fitting the pump. Thanks.

Tony-B
Tony-B

Posted: Thu May 13, 2010 4:54pm

Post Subject: diesel lift pump on BMC1.5 engine

I am really pleased it worked. Well done. Tony Brooks

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