1800 gasser - little more info

rosedale123 · Jun 12, 2016

I am the one with the 1800 gas that starts and idles fine but when the throttle opens it stumbles and can most time be saved by the choke. Mose times when I get the rpm up it will stumble and die like it runs out of fuel. It does have a mechanical fuel pump and with the fuel line unhooked it does "spurt" when the engine in rolled over ( with the key). Carb has been thorougly cleaned and screw turned out 1 3/4 turns. When my FIL go this tractor they had an electric fuel pump installed but I went back to the mechanical pump -- do you think they were telling me something? Fuel flow is good. Does this sound like a fuel issue for sure???? Kinda perplexed.

J. Schwiebert · Jun 12, 2016

O. K. Let us get back to basics . 1800 A series had a cast Marvel carburetor. B. series had an Aluminum Marvel carb and very few had a mechanical fuel pump C series had an aluminum carb and a mechanical fuel pump. 1850 series had a aluminum carburetor and early one had a mechanical fuel pump and later ones an electric fuel pump. The replacement for the aluminum carburetors is a cast iron Zenith. You have a phone number? Have you had the fitting out of the tank? If you stick the fuel line between the carburetor and a small bucket how long does it take to pump a gallon of fuel? Can you rig up a remote tank to run the carburetor on. If this is aluminum carb can you "jerry rig it" and run it off of a remote tank? Just asking. What did you use to measure your float level? Start there!

rosedale123 · Jun 12, 2016

I am not doing very good at providing complete information..sorry. I think I will go tomorrow and and get the tractor serial number. There is also a round "thing " riveted" to the carburetor with numbers ..I will try and get those as well. For what it is worth, The carb looks like a Zenith - the rebuild kit I see on the web looks like it has the gasket that fits this carb ( 6 screws hold the halfs together). The carb has an accelerator pump if that helps. The tractor defiantly has a mechanical fuel pump that is mounted to the block opposite side of the carb. I had steam cleaned the tank and it has an inline filter that I can see thru and the gas looks clean. With the tractor off , the flow that comes out the fuel line is very steady. When the engine is turned over the flow increases. I will get something to measure so you will have a idea of the volumetric flow.

I will gather the information tomorrow after work. My phone is 812-548-0198 -hope to talk to you tomorrow evening.

Thanks for your patience.

duane o. · Jun 12, 2016

One of my Oliver 70's does this. All kinds of gas flow. It turned out to be a vacuum leak in 2 spots. Carb to manifold mounting surface and a couple intake to head gaskets. I checked the manifold with a long strait edge and found 2 ports were below the others causing a leak. Made up some thicker gaskets and assembled. All is good now no more dieing and reaching for the choke.
Hopefully you get it figured out. Duane o.

gary66 · Jun 13, 2016

you can have good flow from the pump for a time, but if there is something in the neck of the glass bowl filter it slows things down. I doubt you cranked it long enough to see it happen. Even if the gas was always clean entering the tank the tank itself can de-laminate and those slivers cause trouble.

Could be the bowl, could be something you did taking it apart and it could be the pump issue was an attempt to fix the problem of crap in the tank. I've had this very same problem with 2 older tractors and both were caused by crap in the tank partially blocking the neck of the glass bowl.

Old stuff and crap in the tank especially when the fuel isn't picked up is a very common problem. According to one old farmer his was vapor lock when it was hot out. His would stumble and die.

1800 gasser - little more info

rosedale123

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J. Schwiebert

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rosedale123

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duane o.

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gary66

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