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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Nov 2002 Posts: 2,766 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,766 | If it is a Zenith carb, it probably has a VACUUM accelerator pump!
While I dislike the word "never"; one should NEVER pump the footfeed on a vehicle with an updraft carburetor! Guess where the fuel goes? The vacuum accelerator pump prevents this, as it will only function after the engine is started, and manifold vacuum has been established.
A vehicle with an updraft carburetor should ALWAYS be started using the choke.
The Carter BB-1 does have a mechanical accelerator pump, so the onus is on the operator NOT to use it.
Jon.
Good carburetion is fuelish hot airThe most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes!The Carburetor Shop | | |
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