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Farmall & IHC Tractors Discussion Forum
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Farmall A fuel starvation problem

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Dave 89

11-05-2005 15:43:03




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My Farmall A has an interesting fuel starvation problem that I can't figure out. The fuel level is about 1 inch above the fuel inlet in the tank. The gascolator (stainer)and fuel valve work fine and all fuel lines are clear. I have a new Wix clear inline fuel filter so I can watch the fuel flow and level in the filter. When I open the fuel valve the gas will VERY, VERY slowly seep in until the filter is about half full of fuel. When I start the engine it runs perfectly but will eventually run out of gas because the fuel flow can't keep up with the usage - and this is even at about an idle. If I crack the fuel line open anywhere, the flow seems to be much better but then when I tighten the fitting the flow slows again. I don't know why the fuel flow is so slow. Could it be because the fuel level in the tank is low and therefore there is not enough "weight" to push the fuel along? It doesn't seem like that should cause the problem but other than that, I can't think of anything. Any advice or suggestions would be greatly appreciated. Thanks! Dave

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Dave 89

11-06-2005 14:28:16




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 Problem solved in reply to Dave 89, 11-05-2005 15:43:03  
I wanted to let everyone who tried to help me know that my fuel problem has been solved. It sounded like the fuel filter was the most likely culprit. I planned on just removing it but my fuel strainer is missing the screen and it turns out my fuel line fitting going into the carb is also missing it's screen. So not wanting to run it without any kind of filter, I decided to find a more appropriate filter to use until I can get the screens for the strainer and the inlet. I wound up going to the hardware store and getting a fuel filter for Briggs & Stratton. This filter (FF-125A) can handle up to 5/16" fuel line and 80 hp. I figured that because this filter is also good for the smaller engines that are also gravity fed, that it might work for my Farmall. I installed it and the flow seems fine and the engine runs perfect. I will still try to get the original screens installed so that everything is original and then I may just remove it although, if it continues to run well, the added protection would be welcomed. Thank you everyone who offered their help. Dave

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El Toro

11-10-2005 06:02:22




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 Re: Problem solved in reply to Dave 89, 11-06-2005 14:28:16  
I would keep that new filter if the engine runs ok. Glad you found the problem. Some of those filters are designed for engines with fuel pumps.
Hal



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Farmer Bob

11-06-2005 21:46:31




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 Re: Problem solved in reply to Dave 89, 11-06-2005 14:28:16  
Glad to hear its fixed. Sometimes it is just a simple thing that can get your head itching.



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Dave in Virginia

11-06-2005 12:43:47




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 Re: Farmall A fuel starvation problem in reply to Dave 89, 11-05-2005 15:43:03  
I have a 200 that I tried adding an inline filter to. I got the same problem until I removed the filter. The whole point of my exercise was that I wanted to get rid of rigid tubing fuel lines that seemed to leak whenever I needed to clean the glass filter remove the carb. After some searching for the correct fittings to handle a flexible fuel line, I ran into the filter problem. I added an inline gas filter because the new fittings did not have the inline metal filter at the carb fuel pipe elbow. I agree with those who say the gravity fed fuel pressure is too low to support a good flow across a modern filter. There is not much "head". I would stil like to add back that inline filter though, as my tank still contains some dirt.

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lee

11-06-2005 05:35:14




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 Re: Farmall A fuel starvation problem in reply to Dave 89, 11-05-2005 15:43:03  
Just take the filter off. i had problems with my completely rebuilt B for several years I struggled with timing, plugs, carb, before I finally took took my add-on in-line filter off.
The tractor straightened out and the carb took adjustment much better. Mine ran pretty good with a full tank of gas but just got slowly starved as the fuel level dropped. I always had it adjusted too rich not knowing compensating for poor fuel flow and low fuel in bowl.

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Peabody

11-05-2005 20:14:57




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 Re: Farmall A fuel starvation problem in reply to Dave 89, 11-05-2005 15:43:03  
Get rid of the filter. Not original equipment. Gravity flow fuel systems do not have enough "gravity" pressure to allow for the free-flow of fuel through a microfilter. A clean sediment bowl does its designed job of separating water and debris from the fuel before entering the carb with no flow restriction. I would almost guarantee that is your problem.



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Dave 89

11-05-2005 19:17:35




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 Re: Farmall A fuel starvation problem in reply to Dave 89, 11-05-2005 15:43:03  
Regarding the Wix filter: If it's not free flowing is it possible the filter may be trapping air in it's body and therefore not letting fuel flow into the filter because of the air pressure? How's that sound? Dave



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Dave 89

11-05-2005 19:10:15




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 Re: Farmall A fuel starvation problem in reply to Dave 89, 11-05-2005 15:43:03  
These are all good ideas. I don"t think it"s a carb problem because I don"t see the fuel filter filling with fuel fast enough to keep the engine running. Once the filter has been given enough time to fill with fuel the engine runs perfect until it runs out again. Farmer Bob"s idea of the fuel filter not being free flowing is a good one but I would think that the filter would still fill up and only cause a problem downstream. BobOHIO"s idea is also good and I will check it out but I seem to get good flow when I disconnect a fitting - kind of like I"m venting the line. I will certainly try Hermit"s idea and just remove the inline filter. This should be such a simple problem to figure out - getting good fuel flow TO the inline filter should be easy. Any more ideas - please let me know. Thank you!

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El Toro

11-05-2005 18:58:36




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 Re: Farmall A fuel starvation problem in reply to Dave 89, 11-05-2005 15:43:03  
I think the Wix filter is the problem too. Hal



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Dave BN

11-05-2005 18:08:54




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 Re: Farmall A fuel starvation problem in reply to Dave 89, 11-05-2005 15:43:03  
What you think is an elbow at the inlet to the carburetor is a screen. This is a replacement part and IH has them. I bought one last Saturday, $10-15, I don't remember as I bought other stuff too. If this is dirty, which I'm sure it is, that could be the problem. Dave.



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sam in mo

11-05-2005 17:52:50




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 Re: Farmall A fuel starvation problem in reply to Dave 89, 11-05-2005 15:43:03  
Is it poss. that the float is stuck in the closed pos. and is not letting the carb. bowl fill up enough to run?



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BobOHIO

11-05-2005 17:34:33




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 Re: Farmall A fuel starvation problem in reply to Dave 89, 11-05-2005 15:43:03  
MY BN was similiar. I had to remove the sediment bowl and clean all passages. It was getting blocked with a tank sealer that was peeling off. I made a "filter" by making one out of screen and then placing the whole thing back up into the tank. This fixed mine and hope it could possibly help you.



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Hermit

11-05-2005 17:06:57




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 Re: Farmall A fuel starvation problem in reply to Dave 89, 11-05-2005 15:43:03  
Have you tried removing the filter, replacing it with a tube and seeing if it dies? That would prove if there's too much flow resistance in the filter.



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Farmer Bob

11-05-2005 15:57:04




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 Re: Farmall A fuel starvation problem in reply to Dave 89, 11-05-2005 15:43:03  
Make sure that Wix fuel filter is not one designed to be used with a fuel pump. Any filter cartridge placed in the old A"s fuel line should be a free flowing filter as it is a purely gravity fed system. As long as the gas in the tank is above the level of the "gascolator" you should get gas to the carb.



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Sam B.

11-06-2005 05:52:01




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 Re: Farmall A fuel starvation problem in reply to Farmer Bob, 11-05-2005 15:57:04  
Dave, I don"t think the filter is the problem. It sounds like the line is getting pinched off when you tighten the fitting. Also check the cap is it venting properly. I do the maintance for a construction company and we have many gas driven Miller welders (Big 40"s) that have a gravity feed system on them and they work fine with inline filter (NAPA # 3032). If you are getting good flow to the carb check the float level it may be too low.

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