I have a 65 F100 with a 75 300 six. For some reason somebody chose to retain the original carb. I have the old Autolite from 65. Heres the deal. If I go in a store for say 20 minutes I come out and my truck is flooded. Thats my only complaint about this carb performance wise. The float setting is correct if not a little shallow. Evidently I have the only one on earth with a flat nosed float needle and a pressed in seat. No kits on the market have this float needle that I have found. This is probably the whole problem. It caused me to have a shiny new rebuilt carb with an old float needle. The one and only thing it really needed probably. I think a very small amount of fuel is slipping by the float valve and when not being consumed by the running engine causes this problem. Am I making sense? I'm hoping someone out there is very familiar with what I am saying and these cabs in general. If the needle and seat are non replaceable then I guess the carb is garbAGE. I would save gas leaving the truck running. Pluss I have to figure every time I even crank the truck and turn it off I am wasteing liquid gold.

 

Your explanation is easy to understand
You may want to contact somebody like PonyCarbs. They specialize in OEM carbs and may have a repair suggestion for you.

 

Greg,

I too have the same problem. I have a 65 F100 I6 with that same carb!! Tried to rebuild but no needle would fit it. Got ****ed and lost the old one now I have none. Looking into a weber cause I just can't find another 1 bbl not even on ebay ( the price has to be right too ) Wishing you (and myself) all the luck in the world fixing this problem . . . . . .

john

 

John, you can get the correct Autolite 1100 from Autozone for around $90. I will know more on that in a few days when mine arrive. They have to be ordered. I ordered an Autolite 1100 and a Carter YF. At the time I was undecided about keeping the seemingly troublesome Autolite. Upgrading to a Carter would give you a more common/modern carb I think. I figured out the whole float needle and seat thing. There are two kits available but no parts stores seem to acknowledge the one we have with the press in seat. The kits are all for the probably later screw in job. We probably have an early run. The only way I figured this out was looking in my Macs Trucks catalog and noticing they have two kits available for this type carb.

I may have mine fixed. You can gently pull/twist the seat out of the airhorn. The darn thing has some kind of rubber seal on the end to keep our problem from happening. What I did was put a light coat of silicone gasket maker around the thing and pushed it back in. I think I have it sealed. I learned the hard way to be very sparing with the RTV. I cut the fuel supply completely off. I took everything out and woked out the excess debris with a paper clip. Seems to work fine so far. Nasty weather has kept me from going out for a long test run. If the thing will hold out I will stick with it. Other than the leak/flood problem the thing seems to perform well. I'm sure if you called Macs they will know which kit to sell you. Seems like they are $16.

So, we can get carbs and we can get kits. We are dealing with 40 year old problems. Just takes a while. I guess you would need to make sure that the proper kit will include the actual metal part of the float needle instead of just the replaceable rubber tip. Since you lost your needle. I would not go spending all my money on a Weber unless I was the kind to want to upgrade everything like aspiration and ignition.

Hope this helps. I'll get back when I know more.....

Greg