View Full Version : GM replacement surge tank cap

08-26-06, 12:29 AM
I went to my local chevy dealer the other day to buy a new cap for my 98 STS. They sold me a 18 PSI cap (the original was 15 PSI) and although it fits, it looks like a totally different design than my original cap. Also it clicks when I tighten it. the original just screws on till its tight. I called the parts guy and he said that is whats listed for my application. All input appreciated. Thanks.

08-26-06, 05:41 AM
Should not be a problem. GM is always making changes to service parts.

If you are concerned about the pressure increase, remember that is only the pressure where venting occurs; it does not mean the pressure is at 18 psi all the time under all conditions.

And I like the idea of a ratcheting (threaded) cap.

FWIW, my '04 has a factory installed 18 psi cap.