I'm wondering if my fuel tank was replaced by a PO back in ancient times. What appears to be a relief valve -- round, perhaps 1" dia, 3/4" deep -- can be seen at the top of the tank, ~4" toward the driver's side of the filler neck. (Observing was done by looking in that direction with a dental mirror held (tightly!) in the filler neck & projecting just below the tank's top).
My filler cap, however, is an original & is marked 'vented'. It is my understanding that a post-1970 replacement tank should be fitted with a such relief valve & thus should be used with a 'sealed' cap such as used on model years '70-'74.
Garage fumes seem more predominant of late & I'm wondering if I have two sources of venting causing this. I've also experienced a 'whiff' of pressure upon removing the filler cap after driving -- never noticed this happening before in decades of midyear ownership. Happened last week after 30 minute return drive (warm day) from event at Colo Springs (6000') to my home at 7600', tank about half full at the time.
I intend to R&R the cork seal between filler neck & tank, along with the 9 sealing machine screws & filler cap gasket. Would installing a sealed cap at this point be appropriate or do I need to further verify that the tank indeed is post-'70? Thanks in advance.
Jeff
My filler cap, however, is an original & is marked 'vented'. It is my understanding that a post-1970 replacement tank should be fitted with a such relief valve & thus should be used with a 'sealed' cap such as used on model years '70-'74.
Garage fumes seem more predominant of late & I'm wondering if I have two sources of venting causing this. I've also experienced a 'whiff' of pressure upon removing the filler cap after driving -- never noticed this happening before in decades of midyear ownership. Happened last week after 30 minute return drive (warm day) from event at Colo Springs (6000') to my home at 7600', tank about half full at the time.
I intend to R&R the cork seal between filler neck & tank, along with the 9 sealing machine screws & filler cap gasket. Would installing a sealed cap at this point be appropriate or do I need to further verify that the tank indeed is post-'70? Thanks in advance.
Jeff
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