50 88 Carburetor Problem - ClassicOldsmobile.com


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Old February 8th, 2018, 05:23 PM   #1
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50 88 Carburetor Problem

I'm having a problem with the carb the engine hesitates when I try to accelerate I have to feather the pedal to make it work. I installed new kit in it, still does not work I think it's the accelerator pump. Any ideas?
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Old February 8th, 2018, 07:50 PM   #2
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It could be the accelerator pump. It could also be a timing issue.
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Old February 9th, 2018, 08:48 AM   #3
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Which carburetor is on your car ,there were two types I believe? If you can take the air cleaner off and see the accelerator nozzles check and see if you are getting a good squirt of fuel, if not that is probably it. I have had lots of problems with the new accelerator pump cups going bad in a very short time... Tedd
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Old February 11th, 2018, 07:43 PM   #4
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I'll check the timing, the carb is a side draft used in 49 and 50 Thanks
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Old February 12th, 2018, 05:16 AM   #5
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Teddy:

If this is the original carb, he can't do that because the 49 and 50 carbs had the airhorn on the rear of the carb. I am guessing the pump which is probably a victim of ethanol.
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Old February 12th, 2018, 09:55 AM   #6
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I couldn't remember when they switch to the 2gc. I have seen 50's Olds with the 2gc but who knows what is original after 60 some years..... Tedd
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Old February 12th, 2018, 11:40 AM   #7
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I imagine over the years a lot of those have been replaced. I actually have an air cleaner for one. It needs some work but I think it could be fixed. Those 49 - 50 carbs were pretty goofy.
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Old February 12th, 2018, 03:37 PM   #8
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Ya, I had a aluminum two two setup for a 303 once upon a time with those carburetors. I think it went into the aluminum scrap pile about 25 years ago... Sad.... Tedd
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Old February 13th, 2018, 01:57 PM   #9
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It also could be a distributor vacuum advance problem. At least such is not uncommon in mid-fifties GM cars.
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Old February 13th, 2018, 04:13 PM   #10
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It sounds like an accelerator pump problem, but check the timing just to be sure. If it's a Rochester, it should be an "AA" model. The number for 1949 was 7001570; 1950 was 7002570. Since you did a rebuild, I'm assuming that you made all the adjustments successfully. The carburetor book says that for 1949 use the outside hole in the pump lever; for 1950 use the center hole. I'm not as familiar with the AA as the 2GC/4GC, but if the pump works similarly in a well, and if it fills with a ball check at the bottom of the well, be sure that the ball check seals completely. This is crucial for good pumping action. If it leaks at all you'll have to carefully resurface it as you would an engine valve seat. Also, the "lip" of the piston should contact the wall of the well completely. Some pistons also have a "check" or "bleed" in the center of the piston. Do a close examination if it is so equipped. New doesn't always mean "good".
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Old February 13th, 2018, 07:46 PM   #11
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Thanks for all help timing is good I'm going to pull it apart and check it out carefully I also think the Ethanol is the problem I've had the car for 20 years the problem started a couple years ago. Where good place to buy rebuild kit?
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Old February 13th, 2018, 08:55 PM   #12
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I bought a kit from Fusick for the 4GC on my 54 and it had an ethanol proof accelerator pump. It stated so on the packaging and I believe the plunger was blue. Most new kits probably do have the ethanol proof plunger. If it has been on the shelf for a number of years, probably not. By the way, if you ever need an original air cleaner for that car I have one. It needs a little work but it is not rusty.
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Old February 14th, 2018, 03:55 AM   #13
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Fusick does show the kit as being available.

https://www.fusickautomotiveproducts...ileCatalog.pdf

Their number is 1116. It's a bit pricey @ $83 + ship, but these kits are difficult to find.

There's also one on eBay, but not much price advantage.

https://www.ebay.com/itm/ROCHESTER-A...!US!-1&vxp=mtr

Daytona Parts Company shows the same.

https://daytonaparts.com/find-your-carburetor-kit.html

Last edited by Ozzie; February 14th, 2018 at 04:31 AM. Reason: added information
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