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

Posted by HH56 On 2008/8/1 21:31:12

Could be vapor lock but I'd think it would have to be awfully warm to act up that quickly--unless the steel tube is right on the exhaust manifold. Do you have a fuel filter where you can see if any gas present?

I had a very similar problem on a 54 and it turned out to be the flex fuel hose was old and brittle. Apparently the inside lining was cracked and loose. Suction was enough to periodically let a piece move and close off. Without the engine running, it would relax and open the line again.

And, as you said, the coil could also be acting up when hot.