Packard Forum Index » Pre-War (1899-1942)

It has a check ball in it. I may try plugging it again. I've tried everything else. And nothing has helped. It sure makes a mess on the garage floor.

Have you checked your float level? Perhaps it's set too high. I wouldn't expect to always be spilling gas to that level into the intake l

For some reason, your carburetor is leaking gasoline or the gasoline in the bowl is boiling after you shut the engine down. There are a number of things in addition to the float, float level, and the needle and seat that can cause internal leakage. Packard used both Carter and Stromberg carburetors in the late 1930's. See the relevant service literature for more information.

My 1936 has a factory heat shield between the carb and exhaust manifold. Check if that's in place.

My '37 120 doesn't have one. It does need one.

I have the float as low as I can get it. It runs out after running for 30 seconds and it runs out, so I can't imagine it's getting that hot that fast to boil.

I would look down the carb throat when it is leaking and see what part is leaking. I've used a bore scope for the hard to see stuff.
My heatshield is a 36 standard 8 the exhaust manifold is only a couple inches from the carb.

The float should be set to the specified level.

Are you running the factory mechanical fuel pump?

If you are running an electric, it could to high of a PSI and I wonder if it overwhelming the float needle valve.

It may be good to take a picture of your carb on the motor so we can see if there is anything obvious missing. Over the years things like insulator blocks, heat shield, line routing etc go missing get changed.

Also, and perhaps it's already been covered, but is your manifold heat riser working correctly?

I was just thinking, I'm not positive there's a carburetor problem. What if the gas is laying in the manifold while it's running not being drawn into the cylinders. Any thoughts? It has the factory fuel pump. Motor seems to run pretty smooth. All cylinders have pretty good compression.