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Matt
Matt, Mechanical Engineer
Category: BMW
Satisfied Customers: 22239
Experience:  BEng hons Mech engineering, in auto industry 22 years
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Diesel is finding its way into the sump. A new fuel pump has

Resolved Question:

Diesel is finding its way into the sump. A new fuel pump has not cured the problem. Any ideas?

The car is running smoothly, and the BMW diagnostic check does not advise of any faults.

Submitted: 3 years ago.
Category: BMW
Expert:  Matt replied 3 years ago.
Hello

for diesel to be in the sump then its likely that 1 or more of the injectors isn't sealing

so its dribbling fuel into the cylinder with the engine off

I'd suggest trying a bottle of injector cleaner 1st and if that doens't help then remove the injectors and have them professionally cleaned and flow tested

this may show up if 1 or more need to be replaced
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