As said, when stumbling, jump out and take the cap off, take it into the truck and drive off and see how it acts.
You can buy ten caps and those cheap sons-a-guns won't vent.....or you can buy one and simply drill a 1/16-3/32 hole near center and be happy.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
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