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Mod | | | Forums66 Topics128,080 Posts1,055,956 Members48,430 | | Most Online14,466
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: Dec 2006 Posts: 71 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2006 Posts: 71 | I have installed a rebuild kit but still get hesitation on accerlation, any help?
Ridge dweller
| | | | | Joined: Oct 2008 Posts: 121 Shop Shark | | Shop Shark Joined: Oct 2008 Posts: 121 | Had the same issue running a pair of them on a 55 pickup several years ago. Never could figure it out.
1955 Chevy 3100
| | | | | Joined: Nov 2006 Posts: 2,544 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 2,544 | have you checked your timing? | | | | | Joined: Aug 2005 Posts: 341 'Bolter | | 'Bolter Joined: Aug 2005 Posts: 341 | With the engine off and air cleaner removed, look down the throat and pump the accelerator to make sure the diaphram is pumping a good stream of gas.
Also, check to see if the throttle shaft is worn and has any play in it which could be a source for an air leak.
Allan
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1951 GMC 1/2-ton
Two 1953 Chevy 3100 5-window
| | | | | Joined: Nov 2002 Posts: 2,766 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,766 | The accelerator pump circuit for the W-1 has:
(A) bracket bolting to throttle shaft with a round hole that becomes elongated
(B) Rod from bracket (A) to cross arm which wears a groove
If either the bracket or the rod wear as above, a hesitation can certainly occur. Replacing these parts often will eliminate a hesitation if the carb is the culprit.
A misfunctioning distributor will also cause a hesitation.
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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