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07-20-2017, 09:03 PM | #41 |
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Join Date: May 2010
Location: Cape Cod MA
Posts: 2,840
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Re: Starving for gas at highway speed
A friend purchased one of the new Zenith carburetors that have been on the market for quite a few years, and up to 45 mph everything was fine, over 45 he experienced hesitation and starving for gas. He tried to find the problem without result and turned the carburetor over to a professional Zenith restorer. After serious testing he found the secondary well side opening was a tiny bit too small so he enlarged it to proper specs and the problem was solved.
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04-14-2021, 04:50 PM | #42 |
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Join Date: Mar 2021
Posts: 1
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Re: Starving for gas at highway speed
Chris - I was reading through this 4-year-old thread of your problem with cutting out above 40mph or so. I was saddened to see the thread end with no solution as I am having same issue. I have rebuilt carb, new ignition, checked fuel, etc, etc. Did you ever resolve yours? Thx...
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04-14-2021, 05:37 PM | #43 |
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Re: Starving for gas at highway speed
King, if you put a new fuel line on check that you don’t have more than 1/8 inch of tubing beyond the ferrule. Common problem. Good luck.
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04-14-2021, 08:51 PM | #44 |
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Join Date: Jan 2012
Location: Western North Carolina
Posts: 3,897
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Re: Starving for gas at highway speed
Sounds like a carburetor problem. Try a different one and if that works take the old carburetor apart to check for good flow through the float valve, the correct float level, correct jets with no clogs, jets tight in their threads, vacuum leaks at throttle arm or flange, etc.
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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. |
04-14-2021, 08:53 PM | #45 |
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Join Date: Jan 2012
Location: Western North Carolina
Posts: 3,897
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Re: Starving for gas at highway speed
By the way, the water will be yellow because of the rust it has picked up and the gasoline will look clear with the small volume. Keep emptying the water out of the sediment bowl.
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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. |
04-14-2021, 10:42 PM | #46 |
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Join Date: May 2010
Location: PASADENA, CA
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Re: Starving for gas at highway speed
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If you have a good steady stream of fuel with the fuel line removed from the carburetor, you may want to check the float valve. My experience, Chris W. |
04-14-2021, 10:57 PM | #47 | |
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Re: Starving for gas at highway speed
Quote:
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04-15-2021, 10:14 AM | #48 |
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Join Date: May 2010
Location: Largo Florida
Posts: 7,225
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Re: Starving for gas at highway speed
Since he hasn't answered must be he got disgusted and sold the monster !
I still think he just had a gas cap issue. |
04-15-2021, 10:42 PM | #49 |
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Join Date: May 2010
Location: PASADENA, CA
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Re: Starving for gas at highway speed
Do you know the office size on the float valve? I’ve seen the spec somewhere, but sure where.
I am not at my shop where I could measure an original and off the top of my head, I do not know the size of the opening in the float valve but if you take it out and look at it, it is obvious that it is a very small hole. I know Brattons has good valves and I am sure other of the parts suppliers also do. I would not recommend Mac's as most of their stuff comes from China. Chris W. |
04-15-2021, 11:48 PM | #50 | |
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Re: Starving for gas at highway speed
Quote:
Probably not as he was online here today around 9:30 Pm.
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04-16-2021, 07:49 AM | #51 |
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Location: Powell, TN
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Re: Starving for gas at highway speed
Just fixed a similar problem with my 28. Ordered a pencil filter for the tank and when I drained the gas and pulled the tank valve, found that valve was only about 1/3 open when turned to open. Removed the valve core and drilled the passageways out larger, ground and amount of the lever stop arm and put a metal ship in the lever opening to tighten it up. Problem solved!
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04-16-2021, 11:06 AM | #52 |
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Location: Largo Florida
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Re: Starving for gas at highway speed
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