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Farmall & IHC Tractors Discussion Forum

F-12 Fuel Pump Travel

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Old F-14

02-13-2018 13:03:08

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What is the expected travel (Stroke) on fuel pump push rod on a F-12?

I'm getting around 1/8" travel, as measured against the engine block with the fuel pump off.

The Original IHC manual I have does not address this at all.

Can anybody share some known observed "good" , "tolerable" or "figures?

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James Williams

02-15-2018 06:13:13

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 Re: F-12 Fuel Pump Travel in reply to Old F-14, 02-13-2018 13:03:08  
OLD 14,I have a 14 that is giving me a problem,and I think the cam shaft is worn.I lengthen the pump rod and shimmed with gaskets.Ran good for a year and nownot pumping enough gas

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02-13-2018 17:47:09

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 Re: F-12 Fuel Pump Travel in reply to Old F-14, 02-13-2018 13:03:08  
If you pull out the push rod it should be 7-1/16 to 7-1/8" long. You need to have not much free play at all when pump is installed.
I have never measure it's movement on out side of block but would say it is about 1/4 to 3/8" movement. You can build up the length of the rod with a little weld and grind to finish end.

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02-13-2018 17:36:15

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 Re: F-12 Fuel Pump Travel in reply to Old F-14, 02-13-2018 13:03:08  
from what i remember when i restored mine it was more than 1/8" it is run off the camshaft. i am presuming your wondering about the lift of the lobe.

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Fritz Maurer

02-13-2018 16:40:59

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 Re: F-12 Fuel Pump Travel in reply to Old F-14, 02-13-2018 13:03:08  
1/8" of travel is o.k. Testing the pump on the tractor can be an exercise in futility because you have to stand next to the tractor and crank it with one hand and feel for pump vacuum with the other; on top of all that, the pump strokes only every other revolution of the starting crank, at half speed. Bench testing is much easier. Also remember the bowl and gasket must be in good condition as this is part of the vacuum circuit.

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Phil Tibbetts

02-13-2018 14:56:48

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 Re: F-12 Fuel Pump Travel in reply to Old F-14, 02-13-2018 13:03:08  
If you are trying to figure out if the fuel pump is working pump the lever by hand while it is off the tractor. If you can hear it and feel it working put it on the tractor and see if it works. You should be able to feel the pump sucking on your finger if you hold it over the inlet while pushing the lever, or crank the engine over with the outlet line removed. That is how I test one

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