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When I bought my car the tank was disconnected and an electric fuel pump was hooked up. I have repaired several of these on my other cars.I found this 1 had the brass seat coming out so I made it so it would stay in. But now I have intermittent problems some times the tank has fuel in it and will not drop it into carb. other times there is no fuel in the vacuum tank. if the car has 14 to 15 inchs of vacuum at the manifold should the tank have the same or close to that when calling for fuel? also when I take the lid off and putting vacuum to the area where the brass seat is it does loose some vacuum should this be air tight when the float is up? maybe I should buy a new lid. thanks for any help.

15 inches of vacuum should pull fuel from the tank. I don't understand how fuel could not get to the carb if there is fuel in the vac. tank. It is a gravity system at that point.

Vacuum pressure should be close to manifold pressure while the tank is filling. It will be near zero when the tank is full, as the chamber is open to the atmosphere at that point.

As for the other intermittent behavior, it might be helpful to post a photo showing what seat you had to repair. Was it the atmosphere inlet or the vacuum inlet?

Have you checked for vacuum leaks in the rest of the system? If you have a leak at the windshield wipers, for example, it will effect the ability to pull fuel. Also, is there a chance you are getting air in the fuel line from the gas tank to the vac. tank?

I hope this helps. Others with more experience will hopefully chip in.

Cheers,

Tom

Just about every line was in the wrong spot I will try to add a picture also I have a inline fuel filter before the vacume tank thats new

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Your lines look correct. I would remove the filter before the tank. You don't want any restrictions in the line before the vac tank. You should have a bowl style filter at the bottom of the tank.