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Anyone else had this carb problem


Restorer32
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1954 Cadillac Rochester 4G carb. Car runs fine until you tramp down the accelerator at which point it stumbles. Upon disassembly we find that  the supposedly alcohol resistant accelerator pump cup has turned itself almost inside out. We have replaced the cup 3 times, same result. All adjustments are as specified and the car runs great until that cup partially inverts, always on quick acceleration. Same result with or without the reinforcing spring in place. Anyone else had this problem? Any ideas?

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Bore is smooth as can be, proper piston and cup, blue Viton synthetic cup. Even though they are supposed to be alcohol resistant the cups we tried seem to swell slightly almost immediately. We have ordered a leather cup. Owner wants to take the car to the Hershey show this weekend. It will run fine for a while but eventually that cup partially inverts, always when you punch the accelerator quickly, which of course makes sense.

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"Ethanol resistant" is not ethanol proof. Neopreme was never better, but it was/is a whole lot cheaper than leather.

 

Put a few drops of light machine oil ( 3 n 1, neetsfoot, etc.) on the leather pump before you install the pump.

 

Jon.

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Sooooo....the new "leather" accelerator pump came in this morning and you guessed it...same old Blue Viton we've been having trouble with. Time for plan B. Customer will take his '64 Caddy to the show while we order a leather pump from Quadrajet.com. Hopefully they will send the correct one.

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Sooooo....the new "leather" accelerator pump came in this morning and you guessed it...same old Blue Viton we've been having trouble with. Time for plan B. Customer will take his '64 Caddy to the show while we order a leather pump from Quadrajet.com. Hopefully they will send the correct one.

 

 

If it isn't, our kits have leather pumps.

 

Jon.

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