Hi Peter,
I believe the cap has a tiny vent so there should be no possibility of either pressure or vacuum. Check the cap vent and clean if possible - otherwise, obtain another cap.
John
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Past : 96 855 T5 CD ruby red, 98 C70GT T5 coupe Saffron, 04 C70GT T5 convertible Navy
Present : 95 855 T5R Gul Yellow
08 C30SE Lux T5 Polestar
11 C70 Solstice T5 Polestar
19 XC40 T5 R-Design Polestar
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