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07-19-2018, 11:23 PM | #21 |
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Re: Gas Blowing Out Exhaust
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07-20-2018, 11:51 AM | #22 |
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Location: Illinois
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Re: Gas Blowing Out Exhaust
I agree that the simplest and best solution would be go to a stock Zenith.
If there is a modelA club chapter in your area they might have a carb and manifold they would give you for little or no cost. John |
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07-22-2018, 08:33 PM | #23 |
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Location: St Charles , Missouri
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Re: Gas Blowing Out Exhaust
Steve, wish you were close ... I’d be happy to help you. Even an economical tillotson carb would be ok. You need a stock l intake and exhausts manifold. You can use some decent originals if you can find some locally or he repro are decent at about $200 Ish delivered . I just think for the time being you would be much better off keeping it simple. No electric fuel pump, no needle and seat pressure issues with carb, etc.
Drop me pm if you want to chat All the best ! Larry Shepard Last edited by larrys40; 07-25-2018 at 07:56 AM. |
07-24-2018, 04:55 PM | #24 |
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Location: Rancho Santa Margarita, CA
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Re: Gas Blowing Out Exhaust
I think your fuel shut off is leaking down the line, just like mine was. I have a downdraft also. After multiple attempts at replacements/rebuilding, etc. I finally installed an in-line ball valve on the fuel line in the engine compartment between the sediment bulb and fuel pump. I left the original leaky valve intact under the tank. The ball valve gives full open flow with a 1/4 turn of the handle with zero leakage down the line.
I am very happy with this improvement and I see this as a permanent fix for my application. As a test, trying running the carb dry, shut off the valve, then come back a day or so later and try to start it up with the valve still shut off. If the engine starts with the valve still closed, you have your answer! |
07-24-2018, 10:14 PM | #25 |
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Re: Gas Blowing Out Exhaust
Sometimes my wife says I have the exact same problem.
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07-25-2018, 11:46 AM | #26 | |
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Re: Gas Blowing Out Exhaust
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1. From the looks of the stain on muffler/manifold joint. 2. And the yellow/brown stain on the intake manifold it is possible that you might have OLD "Gooey-Slimy Gobberment Gasoline" in the tank which Sta-Bil does NOT correct. Possibly the float valve, emulsion tubes and jets are all gummed up. Quote:
Last edited by Benson; 07-25-2018 at 07:16 PM. |
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07-25-2018, 12:38 PM | #27 |
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Join Date: May 2010
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Re: Gas Blowing Out Exhaust
If it is old gas put a small amount on concrete and throw a lighted match in the puddle ... I have seen that sometimes it will not light up.
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07-25-2018, 10:16 PM | #28 | |
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Re: Gas Blowing Out Exhaust
Quote:
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