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Matt, Mechanical Engineer
Category: BMW
Satisfied Customers: 22766
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

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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.


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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