Does anyone have any idea how to undo the water filler cap on my Adria Twin which seems to have stuck in lock mode. The key is turning OK but the cap itself will not move. Ironically for the last 3 years or so it would not lock and I have just twisted the cap into place and left it unlocked.
For some odd reason it is now locked and won`t open. Suggestions would be much appreciated.
Spray some WD40 into the lock then give the filler cap a tap in an anticlockwise direction with a plastic mallet or a normal hammer and a block of wood so not to damage the cap. It may be corroded around the collar so a few taps might just release it.
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