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[Engine] Revs going up and down
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
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
Cheers for the reply
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...
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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