Quote:
Originally Posted by Clan
Don't overlook the vacuum pump . If it is pumping hard trying to build up a vacuum it ejects the air it collects into the back of the pump and out into the camshaft area so will cause a chuff chuff noise !
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It only produces the chuf chuf (lol) noise if there is a leak .If there is no leak then there is no air to produce the chuf chuf (lol) noise
https://www.youtube.com/watch?v=GsiMgQuITSI