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01-03-2021, 09:38 AM | #1 |
Junior Member
Join Date: Jun 2020
Posts: 13
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30 Coupe running too rich
I have a rebuilt carb on my car and I'm running much too rich.
I get nothing from either adjustment. Timing checks out okay and consistent. |
01-03-2021, 12:37 PM | #2 |
Senior Member
Join Date: May 2010
Location: Portland, Oregon
Posts: 5,903
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Re: 30 Coupe running too rich
Which adjustments are you referring to? Who rebuilt the carb, and what did that entail?
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Ray Horton, Portland, OR As you go through life, keep your eye on the donut, not the hole. Last edited by 700rpm; 01-03-2021 at 06:46 PM. |
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01-03-2021, 12:44 PM | #3 |
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Join Date: May 2010
Location: Largo Florida
Posts: 7,225
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Re: 30 Coupe running too rich
Check float level.
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01-03-2021, 12:50 PM | #4 |
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Join Date: May 2010
Location: Clinton,WA/Whidbey Island
Posts: 4,104
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Re: 30 Coupe running too rich
When you rebuilt carb were all passages cleaned out! Jets properly done! and proper gaskets installed.
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01-03-2021, 03:28 PM | #5 |
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Join Date: Jun 2020
Posts: 13
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Re: 30 Coupe running too rich
The carb was purchased from Gaslight and rebuilt by Charlie Armstrong, in Kentucky.
moving the gas adjusting needle has little effect and the idle air screw does nothing. Screw in all the way in and no change. Float level checks at 5/8" and fuel shut-off valve has been replaced. I also replaced the float valve with a Viton tipped one. |
01-03-2021, 04:25 PM | #6 |
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Join Date: May 2020
Location: Corning NY
Posts: 244
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Re: 30 Coupe running too rich
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01-03-2021, 04:53 PM | #7 |
Senior Member
Join Date: May 2010
Location: Between Seattle & Tacoma
Posts: 2,354
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Re: 30 Coupe running too rich
How fast is your idle, when turning the idle air screw. It needs to be 450 rpm, or lower. Otherwise your no longer running on the idle circuit. If running low rpm and no change with idle air screw, then you have a air(vacuum) leak.
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01-03-2021, 07:26 PM | #8 |
Senior Member
Join Date: Jan 2012
Location: Western North Carolina
Posts: 3,897
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Re: 30 Coupe running too rich
Are you using an air filter?
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A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. |
01-04-2021, 12:26 PM | #9 |
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Join Date: May 2010
Location: Washington Cty., ME or Flagler Cty., FL
Posts: 1,106
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Re: 30 Coupe running too rich
Make sure your choke is getting wide open. If the GAV is full closed and still too rich, then most likely the Main Jet is over sized. Ask your rebuilder what the flow data was on your rebuild? The Main Jet should be 150 to 158 ml/min. (36 in. water column test).
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01-04-2021, 02:49 PM | #10 |
Senior Member
Join Date: May 2016
Location: Scottsdale, Arizona
Posts: 612
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Re: 30 Coupe running too rich
Good afternoon...The Model did not come with an air filter...if you are running one...the car will usually run rich...it takes a change of Jets when rebuilding to compensate for the air filter...Ernie in Arizona
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01-04-2021, 04:32 PM | #11 |
Senior Member
Join Date: Jan 2019
Location: Florida Panhandle
Posts: 585
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Re: 30 Coupe running too rich
Also, confirm no vacuum leaks.
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