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Ford Tractors Discussion Forum
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Tw25 fuel screw

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mark in boonville ny

05-27-2019 08:30:20




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How far out was the fuel screw set on from the factory and how much can i play with it before i risk damaging it. Its farm used but the tractor is gutless as hell like litterally just falls on its face so i dont know if someones messed with it already or what but it only has 3400 hrs




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mark in boonville ny

05-27-2019 09:31:48




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 Re: Tw25 fuel screw in reply to mark in boonville ny, 05-27-2019 08:30:20  
How do i check boost pressure and where would the screen be on the bottom tank. Lately it hasnt been sucking from the bottom tank. Also put a new lift pump on it 2 years ago when we bought it. Planned on getting the injectors tested but i havent had time to do so.



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Bern

05-27-2019 11:32:46




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 Re: Tw25 fuel screw in reply to mark in boonville ny, 05-27-2019 09:31:48  
Intake manifold should have an 1/8" NPT pipe plug in it. Screw a 30 PSI gauge in it and work the snot out of it.

The fact that it "hasn't been sucking from the bottom tank" tells me your screen is likely very much plugged. I would start there before bothering to check boost pressure. Screen is at the bottom of the #44 manifold. For some reason it's not listed separately.

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Bern

05-27-2019 09:16:57




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 Re: Tw25 fuel screw in reply to mark in boonville ny, 05-27-2019 08:30:20  
What juniur said. If you can't make at least 15-20PSI of boost at full load, you most likely have a fuel restriction somewhere. Either a plugged screen in the tank (very likely), or maybe a faulty check valve in the lift pump.

There is no set dimension or number of turns for the fuel screw on the pump. That setting is made on a test bench. It is adjusted until the pump flows "x" amount of fuel at a certain RPM for a certain number of strokes. Lacking a test bench, this adjustment is best made with an accurate PTO dyno, which is what I'd suggest your tractor visit if you can't find your fuel restriction.

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juniur

05-27-2019 08:43:19




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 Re: Tw25 fuel screw in reply to mark in boonville ny, 05-27-2019 08:30:20  
I’d check the strainer in the lower tank and be sure you have good flow to the pump before turning the screw. Wouldn’t hurt to check boost pressure either



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