The Stovebolt Site Forums The Shop Area Engine Shop Rochester B Needle, Seat and Gasket sticking

Rebuilt my carb. The engine was running fine, but then started to over flow from where the top of the carb meets the bowl.

The filter prior to the carb had a lot of what seems like rust particles.

I removed the carb, and find fine rust colored particles in the bottom. I'm guessing that the guy I took the tank to for reconditioning didn't seal the inside.

I drained the gas today, and expected to find rust in the gas, but I didn't.

Back to the carb. I am trying to eliminate the cause of the carb over filling. Looking at the Needle seat when I move the float manually up and down the needle doesn't 'fall' back down. I took the new one out, and put the old one back in...same thing. It seems that the needle remains in the up/closed position, and won't fall back down when the float falls. BUT, I would think that this problem would cause a starvation of gas, and not an over flow or flooding situation.

I'm confused. I will check out the floats as well to see if they are leaking. Any suggestions to keep the needle valve going up and down?

Thanks,
Steven

It will go down when the fuel pressure is on it. If it didn't you would not get any gas in the bowl at all. Make sure your float is not full of gas & not bent to where it hangs up on the side of the bowl. Set the float in a can of gas or solvent. It should bobble around like a cork. Make sure the float level is correct. Clean the needle & seat. It should run OK. You may want to put a filter at the entrance to the carb.

Sticky needle and seat. I remember this. I did clean the tank. I did put a filter inline tank to pump. I did put a filter inline pump to carburetor. I did get a sticky needle and seat. My float was OK. the needle and seat were new. So what happened? Old varnish from inside the lines. A good flush and a good cleaning and all was working again. Modern fuel will dissolve stuff you never thought of.

Thanks or the ideas.....I'll keep working on it and letcha know.

I had a flooding issue a few years ago on a carter.

turns out it was old dope on the carb inlet threads

...pic..

I don't use any dope on the threads now.

took me a while to chase that down.
just one more thing to look at