Hi Mark.
There is certainly a non-return valve that you should be able to track back on the feed pipe quite easily. Even if it's not the cause of your problem it clearly can't be working so worth replacing for a few pence and 15 minutes work.
Hope you get it sorted. 2012 TDV8 Westminster in the New Forest
Also: Land Rover Series 3 SWB, Mercedes 280SL, Classic Mini race replica, VW Golf SV
Previously: Audi A8, RR TDV8 Vogue, Audi Allroad, VW Golf GTI Edition 30, Audi A4 Avant, A8, A4 Sport, A6, VW Golf Mk5, Bora, Golf GTI Mk3, Jetta Mk3, Passat, Jetta Mk1, Golf Mk1
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