1960s Carter, Fuel leaking from throttle shaft

[dermike211]

G'day,

1961 S62 with the AFB carburetor. Fuel appears to be leaking from the secondary throttle shaft on both sides after idling https://drive.google.com/file/d/1D_I1EVtoCogVkH2t6vexR-_-jr_tgEAX/view?usp=drivesdk.

Also posting a video of the primary Venturis, it looks like they're just dripping gas down the throat at idle https://drive.google.com/file/d/133n9-wId30Q4vHPf6ldfu42uLwEU6KGk/view?usp=drivesdk.

The motor is spewing gasoline fumes and running very poorly, and will only start when cold. The carb was rebuilt professionally in Jan '22. Car is driven fairly regularly except during the Phoenix AZ summer. https://drive.google.com/file/d/11-SyDb6kgebVjyFqkOm3LSHAt8-fQQXr/view?usp=drivesdk

Complicating the issue is that the car ran flawlessly until the voltage regulator failed and smoked the generator last week. I replaced the voltage regulator with a NOS unit that tested per spec and now the car is having fuel issues. Coincidence?

Mike D

[Dave Shepherd]

High float level, sunk float, leaking needle and seat, excess fuel pressure. Can't see a connection with the electrical work done.

[Chopper1942]

As Dave mentioned, probably a leaking float or debris in a needle. The Carter AFB has 2 floats and 2 needle and seats. It is simple to remove the cover and check the floats and needles for debris.
Remove the choke linkage, accelerator pump linkage, and fuel line. Remove the metering rods. The rods are spring loaded so hold down on the rod cover when you remove the screw  and then remove the metering rod, piston, and spring. Do the same on the other rod. Remove the bowl cover screws. You may need to remove the air cleaner stud also.

Turn the cover over and remove each float pin.  Shake the float and listen for fluid inside of it. You can either weigh each float or put them in a bowl of water and see if they both float and at the same level. Replace the floats as needed. With a wide bladed screwdriver, remove the needle seats and blow out any debris. If the needles and seats look OK, they can be resused. Adjust the float levels and float drop.

I always turned the assembled cover over and blew into the fuel inlet to see if the needles were seating.

Don't over torque the cover screws when reassembling. If you were careful removing the bowl/top cover, you should be able to reuse the gasket.

[dermike211]

Thank you both, much appreciated chopper for the detailed write up. I couldn't discern anything dirty or gunky during the procedure, but this did the trick nonetheless.

Cheers,
MD

[Chopper1942]

What exactly did you find causing the flooding?

[Cadillac Jack 82]

Hopefully she's back out on the road soon.