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09-06-2019, 06:24 PM | #1 |
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Join Date: Feb 2015
Location: Lone Jack Missouri
Posts: 381
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Flat spot in carburetor
Marvel Schreiber carb purchased as new rebuild off Ebay. Car starts and runs fine on the flat but if you get into it or pull a hill it has no power you have to go to almost idle to get it to hit on four and if you ease into it gradually it picks up speed and runs well until you get to a hill then as you give it fuel it just bugs down. Kind of acts like water in the fuel any thoughts?
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09-06-2019, 07:05 PM | #2 |
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Re: Flat spot in carburetor
Sounds like restricted fuel flow into the bowl. This happens on the Zenith when the feed tube is pushed in so far that it hits the filter screen in there.
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09-06-2019, 07:20 PM | #3 |
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Join Date: Feb 2015
Location: Lone Jack Missouri
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Re: Flat spot in carburetor
You might have the answer because this is crazy.
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09-07-2019, 03:51 AM | #4 |
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Join Date: May 2010
Location: Gwynn's Island Va
Posts: 1,386
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Re: Flat spot in carburetor
Might look for a vacuum leak on that carb. The MS carburetor is a good running one. I've been pleased with the performance of them. They have become a popular carburetor at swap meets.
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09-07-2019, 12:29 PM | #5 |
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Join Date: May 2010
Location: Concord CA
Posts: 635
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Re: Flat spot in carburetor
I have Marvels on both my A’s They both run great. Next time you hit a hill open the gav a 1/4 turn or maybe a 1/2 turn, you will notice an instant in crease in power.w
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09-09-2019, 09:14 AM | #6 |
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Location: Western Springs, IL
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Re: Flat spot in carburetor
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09-09-2019, 09:17 AM | #7 |
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Join Date: Apr 2016
Location: Bellingham, WA
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Re: Flat spot in carburetor
Float level correct?
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09-09-2019, 10:31 AM | #8 |
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Join Date: May 2010
Location: Alabama
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Re: Flat spot in carburetor
My experience with improper float level has been that the engine would backfire if the float was set too low . I agree with post 5 and 6 . Usually the pot metal carburetors like the Marvel and Tillotson carbs tend to have more vacume leaks . Opening the GAV a bit more will usually help .
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09-09-2019, 11:43 PM | #9 |
Senior Member
Join Date: Feb 2015
Location: Lone Jack Missouri
Posts: 381
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Re: Flat spot in carburetor
The fellow that I bought the carb from was JR Bullock. Before I took it apart I thought I would ask his opinion. My carburetor has never had fuel in it that wasn't filtered so I really didn't think dirt was a problem nor did he. His advice was to open the gav until it ran properly. If that didn't do the trick ship it back to him for exchange at no charge. This is a genuine kind honest man. Saturday I got 6 metric bolts in the mail that I use on my Kuhn hay mower conditioner. In standard size they are 5/16x 1.5 inches long with 6 nuts the charge on them was 43 dollars, what a hog screwing! The point I am making is that we are so lucky to have good honest vendors in our hobby and they need to be recognized. As for my problem he was spot on and my car runs like a watch.
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