Re: 1940-120-runs fine for a while , then sputters and quits

Posted by Rusty O\'Toole On 2008/8/1 22:40:44

Is your gas cap vented? Cars from before about 1970 had a vent hole in the gas cap to allow air in. If the hole is plugged or the wrong cap used, the engine will run until the vacuum in the tank is equal to the pressure of the fuel pump, then the engine stalls out.

Next time it stalls open the gas cap and listen for a "hiss" of air.