I was going to fill up the wagon with petrol and the fuel tank cap was so tight it would not twist. Went home got a pair of pliers and was able to twist it, but now it would not come off. After sometime, the cap came off. I thought it was a defective cap so I bought a new one and now, it's stuck again. Any insights?

Cheers.

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200 75 W115 (Mom's)
190e 90 2.6 W201
E320 95 Wagon W124
72 BMW 3.0 CSI