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Jul 21st, 2025 | | | | Joined: Dec 2004 Posts: 322 'Bolter | | 'Bolter Joined: Dec 2004 Posts: 322 | A couple of years ago I bought a rebuilt Carter YF 2100S and put it on my stock '57 235. It must have been an older rebuild as I had to replace the gaskets due to a little leak. All has been good until recently. When starting cold in the morning I used to be able to choke and the engine started easily and warmed up fine. Now I can only choke a little and then I have to close the choke or else it runs way too rich and rough. I have also gotten a couple of backfires after slowing for a stop sign and then trying to take off....only one little pop and then it's fine. Gas mileage is also starting to decrease as well.
What do you think....time to rebuild?
Chuck
Blue 50
1950 3100 w/57 235
Patrick’s Saginaw 4 speed and 3:55 rear end
| | | | | Joined: May 2004 Posts: 45 New Guy | | New Guy Joined: May 2004 Posts: 45 | What do you think....time to rebuild? Maybe, but I'd want to rule out ignition first(especially dwell) if it were mine.
Ed Fallon
In seemlingily endless process of restoring a stock 1953 chev 3100 pickup.
| | | | | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | The YF has a diaphragm accelerator pump. With the inclusion of alcohol in today's fuel, it tends to spring a leak internally after a while, I bet if you take it apart you will find a tear in the diaphragm.
Paint & Body Shop moderator
A lone amateur built the Ark. A large group of professionals built the Titanic. | | | | | Joined: Nov 2002 Posts: 2,715 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,715 | 4onthefloor is right about the diaphragm and they do give problems when used with deathanol; however, as Ed suggested, I would check the ignition first.
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 | | | | | Joined: Dec 2004 Posts: 322 'Bolter | | 'Bolter Joined: Dec 2004 Posts: 322 | Thanks for the info. I have been running a pertronix in my stock distributor for awhile...wouldn't the dwell only be a problem with points?
Nothing but deathanol in these parts so I will take a look at the diaphram.
Blue 50
1950 3100 w/57 235
Patrick’s Saginaw 4 speed and 3:55 rear end
| | | | | Joined: Nov 2002 Posts: 2,715 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,715 | Others make take a different view, but I would suggest re-installing a set of points and condenser to see if your problem disappears.
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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