Hi, The 4100 carb on my 60 Galaxie is only drawing gas from the secondary fuel bowl. When I close off that needle/seat valve it will drain the bowl and then die. Any thoughts on this? I thought it might be low vacuum, but it reads a good strong 17 psi, and I do not find any leaks. I have had the carb off several times, cleaned all the passageways, installed new gaskets, and generally rebuilt it twice. I am missing something here.
If it isn't drawing fuel through the primaries, how can it idle at all? No idle circuit on the secondaries.
Good point, I think the idle circuit must be working, but not the main one. These are interesting carbs, you can take the top off and still run the car. I have done this while trying to figure out what is happening. Whatever it is, it is not obvious to me.
When idling it shouldn't draw fuel from the secondaries at all . Sure the carb isn't on backwards???!!!
That really helped. It looks like my secondary butterflies were not completely closed. I closed them and then ran it without gas in the secondary float bowl, and it seems ok. I'll check out the mechanism for opening and closing the butterflies, making sure they close completely. Thanks
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