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6wheeler 
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Joined: 08 Oct 2024
Location: S. central Mn.
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 Topic: 190 XT Gas tractor issue
Posted: 22 hours 43 minutes ago at 3:00pm |
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Hi all. I got my remanufactured carburetor back and it is finally warm enough outside to put it on. I put it on and set the idle air screw to the factory setting 1 1/2 turns. The problem I am having is, I believe a fuel pressure issue. When I crank it, the fuel just lightly spurts out of the fuel line. I think the pump may be bad. I am not getting gas in the crankcase. So, I wonder if it is just a bad diaphragm. Is there a kit for them? Or, would it be better to just put on an electric pump. I believe the system only makes about 2 to 4 psi. But, how many gpm pump would you all suggest? The tractor fires off nicely with a little sniff of happy juice. Just seems like it is not getting enough fuel. There is fuel in the carb. I just don't think it is enough. Any help is appreciated. Thanks. Pat
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Northern Hoser
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Joined: 19 Feb 2020
Location: Canada
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Posted: 22 hours 23 minutes ago at 3:20pm |
Hey Pat, if there is fuel in the carburetor bowl then there is enough fuel for starting. a fuel pump issue will show up if the fuel level in the bowl is allowed to drop enough that it causes a lean condition, usually when its using more fuel under load.
If it's pumping at all while cranking over I'd say that's normal, but I don't know about the 190xt specifically.
If in needs canned heat to light off it's probably another issue
Matt
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tbran
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Joined: 14 Sep 2009
Location: Paris Tn
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Posted: 21 hours 7 minutes ago at 4:36pm |
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A manifold/carb gasket leak is a possibility. IF not then the mixture needs to be richer probably - turn the idle bleed screw in and try again. If you can't crank the unit there is not enough vacuum or an idle circuit is stopped up. If it has no leaks - use ether while idling to spray around manifold to detect leaks - send the carb back.
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When told "it's not the money,it's the principle", remember, it's always the money..
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JimWenigOH
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Joined: 12 Sep 2009
Location: NC Ohio
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Posted: 19 hours 44 minutes ago at 5:59pm |
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Is it the Holley or a Zenith?
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DrAllis
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Joined: 12 Sep 2009
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Posted: 6 hours 47 minutes ago at 6:56am |
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If the fuel pump moves any fuel at all, it should start and run. At wide open throttle sitting still (no load) the engine will consume 2.88 GPH or .048 GPM. So if the fuel pump provides 6+ OUNCES a minute, that is enough to keep it running. Now, when hooked to a plow, the fuel burn rate goes up to 8.03 GPH or .134 GPM ( 17 ounces per minute at full load).
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6wheeler
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Location: S. central Mn.
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Posted: 4 hours 16 minutes ago at 9:27am |
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It is a Zenith Carburetor. 13303A to be specific. I know I have a good seal. When I spray starting fluid around the base it doesn't make any difference. It seems like it is not putting any gas up into the intake at all. It doesn't matter how much I screw in or out the screw. I am starting to think it could be the carburetor has an issue.
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DrAllis
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Posted: 3 hours 54 minutes ago at 9:49am |
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Choke is fully closed tight when you try and start it ?? Throttle must be open some, not a dead slow idle.
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DanielW
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Joined: 19 Sep 2022
Location: Ontario
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Posted: 2 hours 28 minutes ago at 11:15am |
'Then and Now Automotive' in Weymouth, MA has fuel pump kits for them. I believe their part number is CK-42-20, but they can look it up and check. They're very helpful and can cross-reference and build a pump kit for pretty much anything.
Before I rebuilt the original mechanical fuel pump for my 180 gasser (same engine and fuel pump as the gasser 190) I used an electric pump. If you go that route you want as low a psi as possible: 2-4 psi max, and even then you'd better have a good needle valve & seat and they can sometimes be overpowered. And I suspect you're right that the original pump diaphragm is bad and letting gas enter the crankcase - same problem I had.
If I were you, I'd rebuild the original with a kit from Then and Now.
Edited by DanielW - 2 hours 14 minutes ago at 11:29am
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DanielW
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Posted: 2 hours 11 minutes ago at 11:32am |
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I just re-read your original post and see you said you're NOT getting gas in the crankcase. My apologies. I thought you were. It's still probably not a bad idea to rebuild the pump. The rubber of those old diaphragms doesn't hold up to modern fuel very well: The pump on my 180 and a couple diaphragms from a few gas Fordsons I had all turned spongy and permeable with new gas - they all started leaking gas into the crankcase at some point.
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