Gas cap question

You may have a problem with a non-vented cap. As the fuel level in the tank drops, air needs a way in to fill the void or the negative pressure may prevent the fuel pump from getting enough fuel to the carb.

(*>

I thought so, but I was more worried about excess pressure when the fuel warms up :)

mike

That may not happen but what will happen is the fuel tank will start to collapse just like in those science experiments when you applied a vacuum to the plastic/light metal container. I split a tank on a '76 Dodge Ramcharger by not using a vented cap. Those mechanical fuel pumps and probably electric ones are great at pulling/pumping fuel from the tank.

Richard

A lot of the Mustang parts vendors carry gas caps for 64.5 through 73 and later. With the proper one for your year identified as such.

"Hawk" wrote in news: snipped-for-privacy@corp.supernews.com:

The '71 had the canister vent system, but they are often dysfunctional. You can't go wrong with the vented cap.