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BUSY BOLTERS Are you one?  The Shop Area
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Mod | | | Forums66 Topics126,781 Posts1,039,297 Members48,100 | | Most Online2,175
Jul 21st, 2025 | | | | Joined: Jan 2009 Posts: 54 'Bolter | | 'Bolter Joined: Jan 2009 Posts: 54 | I have 69 chevy c10 with a 250 6 cyl and a single barrel carb. My problem is the choke pull off. I replace the little diaphragm but it doesn't seem to last. It works fine for a few drives and then acts like the choke is stuck. I replaced it and its good for a short while. It does pull it off eventually. Any ideas? | | | | | Joined: Feb 2016 Posts: 1,841 'Bolter | | 'Bolter Joined: Feb 2016 Posts: 1,841 | The choke "pull-off" vacuum diaphragm is not supposed to open the choke completely, it is supposed to pull the choke plate open a small amount once the engine starts. The choke thermostat has the job of slowly opening the choke plate to a wide-open position based on the thermostat temperature. I would research and test the choke thermostat. Is the diaphragm being damaged by gasoline or backfiring?
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
| | | | | Joined: Jan 2009 Posts: 54 'Bolter | | 'Bolter Joined: Jan 2009 Posts: 54 | Thanks for the advice. I wil replace both when I get it out of storage. It does not backfire. | | | | | Joined: Feb 2004 Posts: 28,675 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,675 | Are you using original equipment parts, or somebody's offshore made junk? Some of the latter are bad "new in the box".
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Jan 2009 Posts: 54 'Bolter | | 'Bolter Joined: Jan 2009 Posts: 54 | I try not buy "made in ____" parts. Do you recommend a source for original parts? Does gm still make these parts? | | | | | Joined: Oct 2021 Posts: 5,686 'Bolter | | 'Bolter Joined: Oct 2021 Posts: 5,686 | GM doesn't make anything. Restore the old parts if possible or look for NOS stuff.
1950 Chevrolet 3100 (Ol' Roy)
1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1956 Cadillac Sixty Special Fleetwood (The Godfather) | 1966 Oldsmobile Toronado (The Purple Knif) | 1966 Ford Mustang (Little Red) | 1964 Ford Galaxie 500 coupe | 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)
| | | | | Joined: Feb 2004 Posts: 28,675 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,675 | Ebay- - - - -"new old stock" from closed down dealerships, warehouses, etc. There are thousands of them there. You don't necessarily have to use the exact part- - - -a choke unloader is pretty generic, and lots of them will work with a little tweaking of the mounting hardware. "NORS" (new old replacement stock) would be another option- - - -parts made by non-GM manufacturers from the same time frame would also be a good choice.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
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