C1 gas cap - vented or non-vented?

[Keith R.]

I've got a Standt vented cap on my 60 and am trying to determine if it is correct. The Judging Guide says non-vented and Nolan's book on page 239 shows my same vented cap on another 60. Which is correct?

[Mike E.]

Re: C1 gas cap - vented or non-vented?

Non. Tank has vent, once that was added, non-vented caps were used.

[Keith R.]

Re: C1 gas cap - vented or non-vented?

Thanks Mike. I have a copy of a GM Technical Service Bulletin DR #456 from November 21, 1960 that specifies a new cap #3787292 as replacement to #3751022. It reads "Fuel spillage from the gas tank filler cap may occur on early production 1961 Corvettes during right hand turns. The spillage occurs through a vent hole in the filler cap. This cap was installed on units prior to Serial #S101750 and can be identified by the word "VENTED" stamped across the face of the cap. A new Cap Assembly Part #3787292 which incorporates a pressure and vacuum valve to eliminate spillage and also vent the tank is now available in Parts Stock and should be used as replacement on all model Corvettes"

[Sander B.]

Re: C1 gas cap - vented or non-vented?

Hi is this a correct Gas Cap for a 60 ???

thanks Sander,

[John H.]

Re: C1 gas cap - vented or non-vented?

Sander -

It's functionally correct (non-vented), but the factory-installed caps didn't have the wording stamped on them - they were plain.

[John H.]

Re: C1 gas cap - vented or non-vented?

Keith -

Noland makes mention of that bulletin and quotes it on page 337 of his Vol.I book, but also notes that there is no reference to the part number of the cap the one in the bulletin is to replace. At any rate, the one quoted in the bulletin as the replacement with the vacuum/pressure valve was never factory-installed.

[Jack H.]

Be careful with restoration books...

Not all of the pictures shown in various books (including Noland's) are original file footage of untouched GM production vehicles. Some pictures presented represent engineering prototypes, 'mule' or pre-production cars, and others have come from low milage, but serviced cars and/or restored cars presented for judging... You can mis-lead yourself easily if you assume every picture you see is the real McCoy item!