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1850 gas vapor locking?

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Steve

04-15-2003 20:21:33




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Out in the field this afternoon (85 degrees) my 1850 gas would start cutting out at full throttle. If I would back the RPM's down to about 1000, it would come out of it. I could sometimes make a couple of rounds at 2000 RPM's before it would act up. Only part way across the field at full throttle before it would act up. I've checked the sediment bowl and the screen at the carb. There seems to be plenty of fuel when the line is off. Is this vapor locking? Has anybody had the same problem? What did you do to fix it?How did these tractors work in the south where it is hot most of the time? Thanks in advance.

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Bob M

04-16-2003 19:59:55




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 Re: 1850 gas vapor locking? in reply to Steve, 04-15-2003 20:21:33  
Our 1850 was plagued with gas boiling in the tank whe pulling hard in hot weather. Would often get a little "geyser" of gas out the fill cap vent - even with the hood sides removed. Never had the motor lose power or quit however.

Assuming your ignition is OK, problem's gotta be fuel flow restriction. You might check the fuel pump is working properly when hot. Tee a pressure gage in the pump outlet. Should indicate 3 - 5 psi or so under load at governed RPM. If pressure is lower, suspect a bad pump. I've seen where a leaking fuel pump diaphragm will let air get sucked into the pump under heavy load and cause problems like you describe.

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dwm

04-16-2003 12:54:20




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 Re: 1850 gas vapor locking? in reply to Steve, 04-15-2003 20:21:33  
Okay, I'll weigh in on this at the risk of sounding crazy. Vapor lock is certainly possible, but I would bet more on starvation due to a clog somewhere. Also, be careful of using an electric fuel pump. You can easily exceed the fuel pressure capabilities of the needle valve and seat in the carb. On the subject of vapor lock, an old farmer I knew one time had an old Ford grain truck. I was going to use it and raised the hood to check the oil. On the steel fuel line to the carburetor, there were several clothes pins (anyone remember those?). I asked what they were for and he said it vapor locked without the clothes pins, someone had suggested it to him and it worked! At that time, I all but accused him of being crazy, but later in thinking about it, the clothes pins were acting as heat exchangers. Point is, either keep the heat away with a shield of some sort or help it dissipate. Always was odd to me that a gas engine with half the compression seemed to run hotter than a diesel where the idea is to generate enough heat to ignite the fuel without a spark. Good luck with it....

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Ollie

04-16-2003 08:33:28




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 Re: 1850 gas vapor locking? in reply to Steve, 04-15-2003 20:21:33  
I doubt it's vapor lock. Next time it happens, remove the gas cap. If the problem clears up, the cap vent is clogged. Easy enough to fix. Remember, for every "x" gallons of gas you burn, "x" gallons of air must enter the tank through the vent in the cap. They can get dirty real quick; it's a tiny hole with no filter.



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Farmer in the Dells (WI)

04-16-2003 06:55:08




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 Re: 1850 gas vapor locking? in reply to Steve, 04-15-2003 20:21:33  
If you are going to wrap the fuel line, check with your local auto parts house for racing fuel line. It is pricey but it comes braided and insulated to do the same thing in higher heat racing situations. Try opening your fuel cap while it is acting up. Many times that is all it took to clear a lock problem however that is usually when electric pumps were involved under much higher pressures and a vacuum was established. Its worth a look though. If your plugs are the incorrect heat range they may cause the symptoms you describe too. Not knowing your tractor history, many times I have found too hot of plugs in them from people trying to clear up a little smoking when running. I am also trying differnt types of plugs for several colors trying to find the best match. I have noticed my Ford runs much better on specific plugs and even gas. I found it ran much smoother yesterday on gas that has at least 10% ethanol at the pump vs another station that does not. Call me crazy but it seems to make a difference in two of my gas models. Good luck

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ollie99

04-16-2003 00:31:13




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 Re: 1850 gas vapor locking? in reply to Steve, 04-15-2003 20:21:33  
you could put on electric fuel pump. had same problem with an old IH dump truck, that worked for me, or you could wrap some type of insulation around fuel line. hope these help you out.



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Robert

04-15-2003 21:25:08




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 Re: 1850 gas vapor locking? in reply to Steve, 04-15-2003 20:21:33  
I grew up with an 1850 gas. Yes, they can and do vaporlock in the conditions you describe. Our cure was to remove the long side panels in hot weather. This simple fix lets out enough heat that it prevents the problem. The only downside is your 1850's appearance without the side panels. Good luck.



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