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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: Yesterday 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: Yesterday 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: Yesterday 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: Yesterday 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: 10 hours 33 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: 8 hours 2 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: 7 hours 40 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: 6 hours 14 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 - 5 hours 60 minutes ago at 11:29am
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DanielW
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Posted: 5 hours 57 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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6wheeler
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Posted: 1 hour 39 minutes ago at 3:50pm |
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I have an update. I hooked and electric pump up directly to the carb. with a line into a gas can. And, it lit right off. So, I took my air hose and blew the lines out back into the tank. When I looked into the tank afterwards, There were alot of rust chunks that went back into the tank. When I looked into the tank before that? It looked very clean in the bottom. The only thing in there was a piece of the cap gasket. But, it was nowhere near the sediment bowl port. The rust chunks must have came from the line. Or, were trapped in the sediment bowl inlet. For information, you can only see the left side or second sediment bowl inlet through the cap. Not the right hand side one. But, after that? The pump still wouldn't pick up fuel. I hooked the electric fuel pump up to the fuel line to the carb. I let it draw fuel through the line through the factory pump until fuel came. The line was dribbling steady. So, I cranked the engine and, voila! We have fuel, a steady stream. I hooked it back up to the carb. and, it runs fine. So now? The next step will be pulling the sediment bowls off and putting screens in the inlets to keep the rubbish out. It looks like that will be a job getting under the tank. But, I will make it work. Thanks alot for all of the advice. Just glad I got it running. Thanks Pat
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