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Tractor Talk Discussion Forum

Bleeding Fuel Lines

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UpHere

11-07-2003 11:14:30




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Just a quick question - I got my first diesel tractor last year (had gas up to that point) and I was wondering whether you "must" bleed the fuel system when you change fuel filters (IH624) ... I have replaced the secondary filter without needing to (so far) and I have seen my neighbour just fill his filters with fuel and put them back on and away he goes?




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JMS/MN

11-07-2003 12:13:38




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 Re: Bleeding Fuel Lines in reply to UpHere, 11-07-2003 11:14:30  
You need to bleed the system IF you get air in it. If you pre-fill new filters carefully with clean fuel, you should be able to replace them without bleeding the system. There should be a hand primer on the system so you can pump it up before starting. Pump until the air bubbles disappear, just like you would if it lost prime during a long period of non-use, or if the check valve is bad. Might also help if you motor the engine with the compression lever out, so it won't start- then after a few seconds, push the lever in and let it start. If it runs smoothly, it's ok.

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UpHere

11-07-2003 12:42:31




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 Re: Re: Bleeding Fuel Lines in reply to JMS/MN, 11-07-2003 12:13:38  
Thanks for the info. lads - I guess I was lucky earlier - I replaced one without bleeding and it ran fine!



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G-MAN

11-07-2003 15:08:06




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 Re: Re: Re: Bleeding Fuel Lines in reply to UpHere, 11-07-2003 12:42:31  
It just depends on the tractor, engine and fuel system arrangment. The transfer pump will pump more fuel than the engine will burn, so sometimes they'll start and get the filter filled before the injection pump runs out of fuel. The remainder of the fuel goes through the return back to the tank. If you have any doubt, leave the engine at low idle. I've seen them keep running at low idle, and flat-out die when wrapped up some.

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rhudson

11-07-2003 23:56:10




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 Re: Re: Re: Re: Bleeding Fuel Lines in reply to G-MAN, 11-07-2003 15:08:06  
my jd 1020 reprimes with no bleed, no problem. my perkins engines are a royal pain, so is the david browns i have. i have to bleed them at all the usual points. don't know if its the design of the different systems or condition of the systems.



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G-MAN

11-08-2003 12:10:10




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 Re: Re: Re: Re: Re: Bleeding Fuel Lines in reply to rhudson, 11-07-2003 23:56:10  
I hear you on the Perkins comment. I worked on a lot of them in Cat TLBs, and they can be a bear to get going again. A lot of the newer small Deere tractors have self-bleeding systems. I haven't looked into the mechanics of the system, but they apparently work.



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T_Bone

11-09-2003 14:18:49




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 Re: Re: Re: Re: Re: Re: Bleeding Fuel Lines in reply to G-MAN, 11-08-2003 12:10:10  
I learned something from my new PSD. When I ran out of fuel, bad sendor unit, I put in 5gal, opened the fuel filter drain, turned on the key (electric pump), bled the air and fuel into the 5gal can, then shut the filter drain, started right up with no problems.

With that in mind, why couldn't you do the same on a non-electric pump system?

Open the filter drain, add slight pressure to the fuel tank, thus bleeding the air and fuel into a fuel can.

T_Bone

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smurph72

11-07-2003 11:45:37




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 Re: Bleeding Fuel Lines in reply to UpHere, 11-07-2003 11:14:30  
the gas system that you have dealt with only had a carburator (sp?). diesel's are fuel injection systems and have to have the air bled out of the system to function properly. you have to avoid sending air into the injector pump. it will cause damage.

dcm



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old

11-07-2003 11:41:51




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 Re: Bleeding Fuel Lines in reply to UpHere, 11-07-2003 11:14:30  
It depends on the tractor some have things on them to bleed the system when you change the filters some don't, my TD-6 did and my AC 190XT did but not all of them do. Hope this helps some



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Alvin n Ms.

11-09-2003 08:15:02




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 Re: Re: Bleeding Fuel Lines in reply to old, 11-07-2003 11:41:51  
I borrow a hand pump , that was robbed from a penny pinching customers, Catapillar, by an over worked mechanic, after he busted his knuckles on a real hot day. Works real good.



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