Carter AFB accelerator pump well wear.

I have a GENUINE Carter AFB Compe***ion Series carb I started to rebuild. The accelerator pump circuit was'nt working. The "bore" for the accelerator pump well is BADLY scored, not verically as one would think, but horizonally. Anyone know how to deal with this. Does anyone "resleeve" the well, like master and wheel cylinders are done? If not, it's good for parts I guess. Thanks. Butch/56sedandelivery.

 

It's hard to imagine the accel pump bore being that badly worn but with a carb that old with who knows how many miles that was maybe out of a stick car that got even more throttle usage than an auto trans car, anything is possible.

But I'd be more su****ious of a problem with the accelerator pump fuel inlet check valve being left out, not seating properly, sticking etc.. Do you know for a fact that fuel is bleeding past the pump piston or might it be getting pushed back into the float bowl if the inlet check valve is malfunctioning. Been too long now and I can't remember where to tell you to look for the check valve.

If the carb is really that hammered you might want to check for excess wear on the throttle shafts and their bores as well. It might not be worth putting this much effort into it.

 

I really think this carb was used on a mud truck or some other off road rig. Parts of it were encrusted with dirt/dried mud, not grease and grime. There's really no protection to keep anything from getting past the accelerator pump rod, and if mud/dirt ac***ulated there, I could see that happening. The "wear" is obvious, very deep uniform scratches around the cir***ference of the bore. The plunger has no seal what-so-ever. It looked like a lost cause, so what could it hurt; we took a dingleball brake cylinder hone to it and it cleaned up quite a bit. But, it still does'nt seal. Like I said, lots of good parts if it can't be repaired somehow. Other than the accelerator pump well, it looks almost new, now that it's been cleaned up. Maybe I'll try call CARBKING, he posted his phone number on another post. There just are'nt very many carb shops around anymore, with everything be fuel injected now. Anyone else? Thanks. Butch/56sedandelivery.

 

Clean it out with a wheel cylinder hone, then find a neoprene pump plunger that matches.

 

One issue to consider is that Carter used 5 different diameter accelerator pumps. The pump for the Comp series AFB's was the LARGEST of the diameters.

Using the wrong pump will cause fuel to bleed past the pump skirt.

Jon.

 

Yes, the accelerator pump that came in the rebuild kit, dispite being made of br*** and leather instead of plastic and rubber, was way too small. After the brake hone, the accelerator pump seemed to fit smoother and had some resistance to it, but it still does'nt pump fuel at all. This carb main case is probably headed to the recycle bin. It does'nt sound like there's any way to repair it. Butch/56sedandelivery.

 

Well, I found another carb for cheap, even cheaper after I saw it was missing the choke mechanism and linkage, and the secondary air valve. The base is good and there's NO wear in the accelerator pump well. So, I'll just swap a few parts, and hopefully be done with it. Thanks, Butch/56sedandelivery.