C2/C3 fuel tank

[Wally A.]

I just removed the fuel tank out of my 65, after removing i see that it has a pressure relieve valve on the top side
about the size of a Quarter that is flush to the tank, my Question, I believe they used this pressure valve starting in 68 or 69
obviously it came out of my 65...so am i correct to say that this 68/69 tank with the valve, will fit the 63/67 body....
thanks for the input....

[Joe L.]

Re: C2/C3 fuel tank

I just removed the fuel tank out of my 65, after removing i see that it has a pressure relieve valve on the top side
about the size of a Quarter that is flush to the tank, my Question, I believe they used this pressure valve starting in 68 or 69
obviously it came out of my 65...so am i correct to say that this 68/69 tank with the valve, will fit the 63/67 body....
thanks for the input....

Wally------


The tanks with the integral pressure vacuum valve were first used on PRODUCTION Corvettes beginning in late 1969. They later became the SERVICE tanks for all 1963+ Corvettes. So, your tank has been replaced at some point after 1969 with a GM SERVICE tank. There is one other physical difference between original 63-E69 tanks and the later tanks with pressure/vacuum valve. That difference involves the large depressions on the ends of the tanks. The original 63-E69 tanks had rounded depressions. The later tanks had "rectangularish" depressions.

A side note: GM advised that whenever the tanks with integral pressure/vacuum valves were installed on Corvettes not originally equipped with that type tank that a SEALED fuel cap (1970-74 type) should also be used. However, interestingly, late 1969 Corvettes with the integral pressure/vacuum valve tank did not use a sealed cap.

In any event, I HIGHLY recommend that when 1963-E69 Corvettes are fitted with tanks with the integral pressure/vacuum valve that a SEALED cap be used. This will help prevent gasoline fumes from entering the passenger compartment under certain conditions. Save the original vented cap for judging ONLY.