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Farmall & IHC Tractors Discussion Forum
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diesel fuel

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Rodney E. Axfor

03-29-2007 17:05:08




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Does anyone know if diesel fuel can break down with age to the point it will not burn in a diesel engine? I'm working on a 6 cyl IH gas over diesel engine. It runs fine on gas but switching to diesel, it does absolutely nothing. Just dies. Both fuel filters have been changed and the pressure gauage on the pump reads 55 lbs. pressure. When I say it just dies it does, not one fire, no exhaust, not even one little fart. The fuel in the tank is 8 or 9 years old. is it possible this is the problem? Any help on this or things to check on the pump will be greatly appreciated. Rod

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shawn morrison

03-30-2007 15:35:49




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 Re: diesel fuel in reply to Rodney E. Axford, 03-29-2007 17:05:08  
sounds like rack in pump is stuck



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dej(jed)

03-30-2007 05:23:54




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 Re: diesel fuel in reply to Rodney E. Axford, 03-29-2007 17:05:08  
We see it quite often in the fuels lab. Diesel is actually less stable than gasoline. A few years back we did a project for the Navy. They sent us samples from all of their worldwide reserves and we tested them for quality. Based on the testing data they then had to have almost all of the fuels hydro treated to clean them up. Old Diesel can give you big problems.



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T_Bone

03-29-2007 23:49:18




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 Re: diesel fuel in reply to Rodney E. Axford, 03-29-2007 17:05:08  
Hi Rodney,

I would say bad diesel would be my last choice of why a engine wouldn't run. A diesel engine will run on just about any fuel, ether, kerosene, gasoline, (the lighter weight fuels), or No2 disilate, to No4 fuel oil and even No6 fuel oil (very heavy viscosity) if heated, to pure vegetable oil.

Depending on oil quality, depends on how well the engine will run and how long it will last, but it will run. If you had a engine miss or not pulling upto maximum load then I would look at the fuel quality.

On a non-running engine, I'd be looking for another problem, plugged return, air in the fuel, fuel shut off or plugged, bad primary pump, etc.

T_Bone

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Rodney E. Axford

03-30-2007 14:04:00




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 Re: to T_Bone in reply to T_Bone, 03-29-2007 23:49:18  
Thanks for the reply. I have to agree with you. I have had some experience with old fuel, but not quite this old. My experience with older fuel was that the engine would run after a fashion, excess smoke, intermitent miss, and hard starting, no power at all. I will now turn my attention to the pump. Rodney



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mccormick 40

03-29-2007 18:37:27




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 Re: diesel fuel in reply to Rodney E. Axford, 03-29-2007 17:05:08  
I would say the plunger is stuck in the injector pump. The gage just shows primary pump pressure. I had the same thing on my super md. Exactly how it acts when it does that.



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Rodney E. Axford

03-30-2007 13:48:03




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 Re:to mccormick 40 in reply to mccormick 40, 03-29-2007 18:37:27  
thank you for the info on the pump. can the injector be removed on the tractor or does the pump need to be removed first. Rodney



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RayP(MI)

03-29-2007 18:17:43




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 Re: diesel fuel in reply to Rodney E. Axford, 03-29-2007 17:05:08  
Did you properly bleed the system after installing he filters? Air in the system doesn't run worth a darn!



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Steven@AZ

03-29-2007 17:50:14




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 Re: diesel fuel in reply to Rodney E. Axford, 03-29-2007 17:05:08  
Personally, I wouldn't trust diesel past a couple years... With fuel that old, I agree with what has already been posted... there is probably water in the fuel and/or most of the volatile (the stuff that actually burns) material has evaporated away, leaving nothing but the wax and oil...

Drain fuel tank, new filters, bleed out the system, etc. and give it another whirl.



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dcw

03-29-2007 17:30:42




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 Re: diesel fuel in reply to Rodney E. Axford, 03-29-2007 17:05:08  
If your asking,you must have reason to believe that this is your problem.Yes,it does have a shelf life,but what it does to the paper filters would.be more important.I'd drain the tank,flush the lines and pump,change the filters,then try it.

Check the shutoff,you might be getting 55lbs of fuel pressure,doesn't mean the injector pump is injecting it.



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old

03-29-2007 17:30:15




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 Re: diesel fuel in reply to Rodney E. Axford, 03-29-2007 17:05:08  
Fuel that old doesn't burn well and can gum up things also. I would drain the tank and the lines and change the filters you probably have a lot of water in very poor fuel and either one of both could well be your problem



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