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[Engine] Revs going up and down
#1
Hi my 2001 berlingo has started to act strange the revs will go up and down  then will settle i checked fuel lines and found air in them inspected fir any leaks have found nothing leaking or damp

Has any one had this problem
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#2
The fuel pump sucks so it will suck air into the fuel lines , does not always let fuel leak out .

The primer pump and the fuel filter seal are the main culprits
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#3
Cheers for the reply
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#4
Presuming it's a 1.9d with clear fuel lines? If the crank sensor goes down this will often result in funny revving and all manner of knocking when the pump timing is cocked up...
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#5
Found the problem the feed line from fuel tank has two green o rings up at the engine were it conects to a plastic joiner both o rings replaced enigine now running fine and no air in furl system
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