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B Farmall engine trouble

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Tracy Gruetzmac

04-30-2007 11:00:25




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I have stearted the 3rd mowing season with a B narrow farmall w/woods belly mower. The past 2 seasons 1 or 2 times during a 2 hour mow job the engine would quit. I would hit the starter it would fire up and run perfect again. Now this year while mowing the engine quits every 10 minutes. I suspected a fuel problem since the carbureator and the fuel shut off/sediment bowl under the tank both leak a little fuel. So I took the carb off and had the local Case IH dealer clean it and repair it as needed. Dealer said he put new jet and seat in it. I put it back on and still have the same problem, engine shuts off every 10 minutes. The fuel line has an inline filter down hill from the sediment bowl/shut off valve and then down hill from that is the carb. So I figured the filter was plugged. The existing in-line filter has a metal housing, the replacement has a clear plastic housing. I was able to watch the filter fill with fuel. I put the new filter on, engine still shuts off every 10 minutes. However I noticed that the fuel filter was empty. I fiddled with the leaky shutt off valve and eventually the filter did fill with fuel. So I thought it must be a faulty shut off valve, I replaced with a new shut off valve/sediment bowl. With the valve open the sediment bowl would not fill with gas until I loosend the thumb screw up under the sediment bowl. The fuel tank has 3-4 inches of gas in it. So after all that off I go to mow again and the darn engine quits after 10 minutes. The sediment bowl is full of gas and the clear plastic inline filter is empty. The only way I can get the in line filter to fill is to crack the fuel line as if to vent it (burp it). I finally got the lawn mowed after several engine quits and then filling the filter by burping/venting sessions. I realize this is a gravity feed system but it is not working or is the carb some how back pressurizing the filter?? I even left the gas tank cap off while mowing and the darn thing quit due to no gas in the filter. Can someone please help me out...I would sure appreciate it.

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Tallperson

04-30-2007 15:25:58




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 Re: B Farmall engine trouble in reply to Tracy Gruetzmacher, 04-30-2007 11:00:25  
Don't forget what the guys said about a plugged or partially plugged vent on your fuel cap... If the tank goes on a vacuum it will not flow fuel.. Good luck Tallperson



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chadd

04-30-2007 14:26:56




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 Re: B Farmall engine trouble in reply to Tracy Gruetzmacher, 04-30-2007 11:00:25  
Is the screen still in place at the end of the fuel line where it enters the carb? If so that could be plugged up. That fuel filter must be able to be used for engines without a fuel pump (your B has gravity feed, which isn't strong enough to suck through the thick filter media). We put a clear plastic filter on our M. It ran really terrible and got worse with running time and load, the oil pressure dropped to 25 psi while idling with new 30W oil, and the temp gauge never moved past run while pulling the disk. When I saw steam out of the cap, I had an idea what was happening (it was VERY lean). Took off the filter and replaced the fuel line and the screens (also reset the timing, as it was a little off). Runs like a top, oil pressure is 55 or so at low idle, and thanks to a new temp gauge, it runs just under the run range unless worked hard. Also, I always clean the hole between the tank and the sediment bowl by blowing compressed air into the sediment bowl opening with the line removed and with the gas tank cap off. After draining the fuel system, it is normal (in my experience, anyway) for it to not refill immediately. Only the tractor with a small float bowl leak will refill immediately. Once it starts and runs a couple minutes, the sediment bowl or filter should be full.

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gene bender

04-30-2007 19:54:09




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 Re: B Farmall engine trouble in reply to chadd, 04-30-2007 14:26:56  
Those filters can work in-line if they are installed correct just have to have the carb end pointed towards the carb use the FRAM G-2 Got to have a clean tank first. Nice thing about the clear one is you can see when they are plugged. Seems like several posts say you cannot use a in-line filter on gravity systems wonder how mine work then. IF the tank outlet is plugged at the sediment bulb wont get any flow. I always use the in-line ones when getting a new to me tractor as never know what you have bought.Even found straw pieces in a gas tank but the kids had to have something to do. Even had a froze float on the pin previous owner said its a new carb. Well maybe it once was.

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Pete in Holland, MI

04-30-2007 14:23:19




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 Re: B Farmall engine trouble in reply to Tracy Gruetzmacher, 04-30-2007 11:00:25  
Take the gas line off at the carb then turn on the gas, you should get a good stream of gas, not a dribble.

Get rid of the in line filter. The sediment bowl is what is supposed to catch the heavy stuff. A screen in the carb catches the rest.

The vent in the gas cap is a probable excuse. When you have the gas line off the carb and let a quart run thru it, if it starts to ween off, open the gas cap. Restored flow indicates a blocked vent.

What you may have is scale in the tank that covers the inlet of the fuel bowl fitting in the bottom of the tank. Scale is a problem in old tanks. Remove the bowl from the tank and see if any junk has settled in the fitting. If it has, clean & dry, then vacuum the tank as best as you can. After that, find a 3" piece of copper tubing that will fit inside of the fuel bowl tank fitting and solder/press it in. Crimp the top shut and drill a couple dozen 1/16" holes in the copper tube stand-pipe. Sediment will settle to the bottom of the tank, but gas can still be pre-filtered thru the stand pipe and not clog the bowl's fitting. Has cured several tractors I've had.

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El Toro

04-30-2007 13:09:40




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 Re: B Farmall engine trouble in reply to Tracy Gruetzmacher, 04-30-2007 11:00:25  
I thinks its the filter too. Hal
PS: When it quits do you still have fire to the plugs? That filter may not be for a gravity fed fuel system.



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Tracy Gruetzmacher

05-01-2007 04:20:11




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 Re: B Farmall engine trouble in reply to El Toro, 04-30-2007 13:09:40  
I have not checked for spark when engine quits because immediately after the fuel filter fills a little with gas it will start right. Where would be the easiest/quickest place to check for spark?



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El Toro

05-01-2007 04:29:06




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 Re: B Farmall engine trouble in reply to Tracy Gruetzmacher, 05-01-2007 04:20:11  
You can pull a plug wire off and hold it away from the plug while someone cranks the engine or pull the coil wire from the cap and do the same thing. Hal



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CGtractor

04-30-2007 11:56:37




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 Re: B Farmall engine trouble in reply to Tracy Gruetzmacher, 04-30-2007 11:00:25  
I had similar problems with my Super C. It turned out that the fuel cap wasn't venting properly. Good luck.



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glennster

04-30-2007 11:05:39




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 Re: B Farmall engine trouble in reply to Tracy Gruetzmacher, 04-30-2007 11:00:25  
probably your fuel filter is the culprit. more than likely its for a pressure fuel system. zip on down to napa and pick up a 3031 or 3032 in line filter. its a big metal one, flows good for gravity system. one is for 5/16 line , the other for 3/8 line. you may be better off replacing the sediment bowl asem with a new one if yours is worn out and then eliminate the in line filter all together.



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Tracy Gruetzmacher

04-30-2007 11:20:06




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 Re: B Farmall engine trouble in reply to glennster, 04-30-2007 11:05:39  
glennster, thanks for the info, however I have already replaced the shut off valve/sediment bowl with a new case IH assembly in the course of the trouble shooting I explained. But I will try the fuel filter you suggested.

thanks



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chadd

04-30-2007 16:39:07




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 Re: B Farmall engine trouble in reply to Tracy Gruetzmacher, 04-30-2007 11:20:06  
If you replaced the sediment bowl assembly and the screen in it with new ones, I wouldn't bother putting that in-line filter back on. With the sediment bowl, the fine screen in it, and the screen in the carb, the system will have more trash capacity than that filter did. You can hold a LOT more sediment in the old system than the filter can hold without affecting performance. The filter is more or less for those tractors that don't have the screens in anymore. I guess you could keep it for piece of mind, but all it is doing is adding a little more flow restriction, although it is probably scarcely measurable. . .

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