The Gas Cap on my 1974 Chevy Step side has a cracked and worn out gasket. I am going to replace it as it is venting fuel outside when the truck is just setting. Price of gas and pollution standards makes this prohibitive. I am faced with the choice of a vented or non vented cap depending on whether or not the truck has an evaporative emissions system. Can anybody out there tell me if that was standard on the 74 or how to check for it? (Maybe look for a specific piece of equipment or something? Thanks in advance for your help.
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