1967 Pontiac LeMans Carb Float Sticks

1967 PONTIAC LEMANS
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LEMANS
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I have a 1967 Pontiac LeMans with a 326 engine and a Rochester 2GC carb. Th e engine floods because the carb float sticks. The carb has been rebuilt 3 times: once by my Pontiac dealer, and I have replaced the float. The only thing that seems to work is to rap on the fuel filter with the handle of a screw driver. :( Any ideas?
Mar 31, 2006 at 9:21 AM
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LOSONE
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That carb may have a plastic block that fits over the float chamber--it might be binding. If it has a metal float look for shiny places on the float where it has beeen rubbing. Sometimes the needle is missing the small clip to hold it on the float.

Wish I had it on my bench--I could fix it blindfolded.
Mar 31, 2006 at 9:40 AM
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LEMANS
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[quote:212b37395a="losone"]That carb may have a plastic block that fits over the float chamber--it might be binding. If it has a metal float look for shiny places on the float where it has beeen rubbing. Sometimes the needle is missing the small clip to hold it on the float.

Wish I had it on my bench--I could fix it blindfolded.[/quote:212b37395a]

[quote:212b37395a="lemans"]
Thanks for the help, funny thing about it, it only happens if the car sits for about 5 days or more. I don't really trust the plastic one so I am going to get a brass one and give that a shot. - Thanks[/quote:212b37395a]
Apr 1, 2006 at 10:48 PM
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IMNOTLOKIN
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Have the same car to this day. Back in the late 70's I found the same problem with the plastic float cover. My car, at the time, needle was sticking in the plastic. I used a small drill bit to open the hole very slighty. The pin should move freely in the hole. I think this card also has a rubber washer and rod on top? Make sure it seals the vent off. This work for me.
Nov 14, 2007 at 10:29 AM

Suggested Repair

Check the plastic block over the float chamber for binding. On a metal float, look for shiny rub marks. Confirm the needle has the small clip that holds it to the float. If the needle sticks in the plastic cover, slightly enlarge the hole so the pin moves freely, and verify the top rubber washer and rod seal the vent.

Conversation Summary

A 1967 Pontiac LeMans with a 326 and Rochester 2GC floods because the carb float sticks, even after three rebuilds and a new float. Tapping the fuel filter temporarily frees it, and the problem mainly appears after the car sits about five days. Advice was to check a binding plastic float-chamber block, float rub marks, and a missing needle clip. Another owner fixed a sticking needle by slightly opening the plastic cover hole so the pin moved freely and confirming the vent seal.

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