Oil leak at fuel pump

[andrew honychurch]

OK, so a bit of a weird problem has arisen on the T16. Basically, I have oil being emitted out of the fuel drip hole in the bottom of my mechanical fuel pump. As it happens , its quite a lot, enough to make it un reasonable to drive and foul up my engine bay floor. It does not do it until the engine is thoroughly warm and driving reasonable hard.

On the T16, there is an oil relief valve on the oil cooler circuit, and on mine there is a very professional looking mod which takes oil from the cooler return circuit and feeds it directly back into the oil filler/breather tube directly above the fuel pump . This could be responsible for jetting oil directly into the fuel pump sump, but I doubt it as its meant to flow directly down the fuel pump pushrod tube and back to the sump.

This is very confusing, and at present I am looking at crankcase pressure , oil relief valve, cooler relief valve malfunction. I did a quick Google and found that there has been some problems associated with ensuring that there is clearance on the pushrod so that it doesn not cause a cause a crack in the fuel pump housing . Anway, any thoughts are as always much appreciated as at present I am somewhat baffled.