There is one way valve inside one of the hoses, it is the feed hose from reservoir to the pump. Mine is a bit worth for wear and I wanted to replace it but new one was something like £192( that wa slike 10 years ago, might be no longer available) and any aftermarket/general usage hose would not have the valve so I am stuck with the old one just occasionally tightening clip by the reservoir as that's where the rubber is perished and leaking.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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