Rebuilt top half of carb, wont start, how do you adjust the float?
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Senior Member
Joined: Jun 2001
Posts: 673
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From: Northern California
Car: 1992 Camaro Z28 & 2k3 Cadillac CTS
Engine: LB9
Transmission: T56
Axle/Gears: 3:43
Rebuilt top half of carb, wont start, how do you adjust the float?
Well i finally found out why my car wasn't running very well. Stupid me when i was drilling out the rivets from the IAB valve, the tip of the drill piece broke off and fell into the carb, and wedging itself between the metering rods. What a joke, it was holding it up and causing serious problems. Well my father and i spent about three hours rebuilding the top half of it and it came out well. We put it on the car, connected everything then went to start it. It wasnt starting, so we decided to pour fuel in the bowls. It would then start, but soon after spit fuel out of the carb and die. I searched the archives and im assuming its my float levels. I need to know how i can adjust it on the car, or do i have to pull it off all over again? I really dont want to have to pull the top of the carb off again, it was tough the first time to put it back on correctly. If i pour enough fuel in the carb, i can get it to start and it will idle for about ten seconds, then slowly die. I have fuel coming into the carb, (ran the line into a glass jar and cranked). My fuel filter is good. Choke is closed (cranked it open just incase i had flooded it, nothing different). If anyone, five7kid damon anyone can help me it would be greatly appreciated as i have work in like four hours.
Joined: Mar 2000
Posts: 43,187
Likes: 45
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Q-jet?
You have to take off the air horn. Yep, no fun, but no other way.
If you didn't touch that, curious how it might now need adjusting. Perhaps something wasn't put together quite right.
Do you have any book(s) on the subject? Even the Haynes manual is better than nothing.
You have to take off the air horn. Yep, no fun, but no other way.
If you didn't touch that, curious how it might now need adjusting. Perhaps something wasn't put together quite right.
Do you have any book(s) on the subject? Even the Haynes manual is better than nothing.
Thread Starter
Senior Member
Joined: Jun 2001
Posts: 673
Likes: 0
From: Northern California
Car: 1992 Camaro Z28 & 2k3 Cadillac CTS
Engine: LB9
Transmission: T56
Axle/Gears: 3:43
yes ive got the hayes manual and last night my father and i put everything together just as we took it out, we didnt find the book much help it was more hassle to try and find a page then to do it by memory. i have the airhorn off now, and it took all of ten minutes so thats no big thing, kept the carb on the car. now i just need to know how to seat that float needle and float. i took a pic of how it sits now
Joined: Mar 2000
Posts: 43,187
Likes: 45
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Press down lightly but firmly on the pin on which the float pivots, and at the same time on the short end above the needle & seat. That will bring the floating end up. Measure the distance from the back end of the float and the top of the bowl, set it to the book.
Make sure nothing is holding the float up (needle down) as it goes back together.
Make sure nothing is holding the float up (needle down) as it goes back together.
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