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As far as I've seen the black Nitrophyl solid ones...No. The white/brownish hollow ones and the brass hollow ones....Yes. With normal gas in the bowl.
I've never felt a Nitrophyl float to feel heavy. But I'd bet they are cheap. If then I'd replace it.
The Holley 1940 carburetor uses a Nitropyl type of float and because they tend to absorb fuel over time, we recommend that they be replaced at each carburetor rebuild. Once a Nitrophyl float has absorbed fuel it will become too heavy and allow more fuel to enter the bowl than what is needed, causing a flooding effect.
The Nitrophyl float can be identified by the black color and it looks like it is made of a plastic material. We now have the brass replacement floats for the Holley 1940.
The Holley 1940 carburetor uses a Nitropyl type of float and because they tend to absorb fuel over time, we recommend that they be replaced at each carburetor rebuild. Once a Nitrophyl float has absorbed fuel it will become too heavy and allow more fuel to enter the bowl than what is needed, causing a flooding effect.
The Nitrophyl float can be identified by the black color and it looks like it is made of a plastic material. We now have the brass replacement floats for the Holley 1940.
Holley 1940 Float
"over time"? I can see where this could be true. I,personally, have never seen it. BUT, I will tell you , whenever I rebuild a carb I replace the float. No matter what material it's made out of. Cheap insurance for a happy carb. No come backs.
"over time"? I can see where this could be true. I,personally, have never seen it. BUT, I will tell you , whenever I rebuild a carb I replace the float. No matter what material it's made out of. Cheap insurance for a happy carb. No come backs.
Depends. A float that is "saturated" with gas as they described would get heavier than normal. Wouldn't be able to "float" as normal. This float would sink a bit thereby not completely shutting off the needle and seat. Which is fuel "in". So the fuel bowl would over fill. Then gas would come out of the bowl vent tube in your pic below. But with all these questions it seems to me you are too worried about it. I bet a new one cost all of $6.00 or so. Why not buy one and rest your mind?
I think it is the plunger over the pintle gig in my post #14. WWWAAAYYYY back in the day I did it myself. 1987 or so rebuilding one for a neighbor's dodge truck. It was my 1st Holley 1V. I don't 100% remember what the plunger next to the pintle creates but I'm thinkin' it was idle. The next time I did one I was more careful about it. Nary a problem.
200ci with a holly model 1940 (?) on a late 69's engine..
Rebuilt by an actual (?) professional...
Will not idle, no fuel getting through except main jet and acc pump..
Gaskets seem right..
I see nothing blocked? HELP!!
i had the same problem years ago!!
the solution is ether a vacuum choke or an electric one!!
i notice your pictures that your carb has the mounts for a choke!
oh also there's a temperature choke too' that will keep you idle right!!
coss you know when the choke is working creates a tension on your carb butterfly,
that's my humble opinion hope it works for you!!
04-08-2015, 03:27 PM
then I'd replace it.
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