406 erratic fuel gage.

hello,

ive got a pug 406 auto saloon, recently the fuel qty indication ha increased from 1/4 to full during normal running. the gage returns t normal after the fuel cap is removed, this process lets vacuum out o the tank (i think the tank is distorting causing the sender t misread!). the gage stays where it should be if i run/motor with th fuel cap removed. can anyone tell me if there is a vent for the fuel tank, where it is a it may be blocked or if there is a non return vent valve that may hav got stuck? thanks in advance.....

-- pete

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