Autolite 2100 Accelerator pump system for 1961-1963

This carburetor was never used on a Mustang by Ford, but, occasionally, one might find that this is what someone has put on their car at some time in the past, and it looks different enough to sort of throw somebody off for a moment. The first picture is a page out of the training manual that Ford gave to the people that were preparing to become factory trained service personnel.

 In this next picture, you will notice that there are what appears to be two holes in the front of the carb instead of the usual one hole for the pump inlet. This is actually a deception. The upper hole is not a hole at all, but is plugged up. The lower hole is the inlet hole. This hole does not get one of those rubbery flap thingies that people are accustomed to seeing.

 In this picture you see that hole drilled down into the top of the pump housing, and, if you look carefully, you will notice a check ball down in the bottom of the hole.

 In this picture, the screw has been placed in that hole with the check ball down inside it. You want to run that screw in far enough to prevent it from leaking, but, not so far that it prevents the check ball from being able to come up and let fuel into the pump housing. How this works is that when you step on the gas, and actuate the accelerator pump, the pressure pushes the inlet check ball down to prevent fuel from just being pumped back into the float bowl, giving it only one place to go, which would be through the cast channel, up into the banjo bolt, and out through the discharge in the booster venturis. This part of the system is the same as the system on the 2bbl carb that Mustang left the factory with.