BMW 525 TDS 1994 Hard start

BMW 525 TDS (Diesel) 1994 Hard start from cold
When Fuel Filter changed car starts perfect for 3 x weeks then reverts back to Hard starting again.
If you remove the new fuel filter then refit car starts ok for a short while 1-2 weeks.
Unable to detect any fuel leaks .
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back
while
Check again- you must have fuel running back to the tank whilst she sits causing it..
Does the fuel filter body have a push button priming device on the top? If so the internal diaphragms often split and introduce air..
Tim..
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Vauxhalls suffer this exact problem, on those it is the spill pipes from the injectors, they get porous with age, a new set cures it every time, so have a close look, unless they are like new replace them, it is very cheap and easy to do.
mrcheerful
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