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Allis Chalmers Discussion Forum
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7030 diesel with gas problems

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aFORDable

04-23-2008 19:49:46




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Our 7030 was recently mistakenly filled with gas, (added to some diesel in tank) taken to the field and worked for about 30 minutes, lost power and hobbled out. The gas was drained out, it was filled with diesel, ran fine for 20 minutes and then lost power again. Changed the fuel filter next day, ran good for 20 minutes and then lost power again. It seems to run ok until it warms up. After it sits a few minutes it will crank and run but won't work under load. When idiling it will run even for awhile then drop a few rpms but will then pick back up. Any ideas? Are the symptoms now just a coincidence and maybe the injectors or pump are in need of repair or is there something we can try without a dealer/shop visit? (Yea, I know, but no comments on the gas misadventure and no, it was not me that was guilty but I've done worse. Thanks.

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cadet trooper

04-24-2008 16:24:12




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 Re: 7030 diesel with gas problems in reply to aFORDable, 04-23-2008 19:49:46  
Yaa, the Roosy doesn't like gasoline at all. Also the gas may have broke down a bunch of floaties in your fuel tank and I can't remember if the 30 has a metal fuel tank or plastic like the black belly tractors good luck.



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Edpap

04-24-2008 05:34:52




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 Re: 7030 diesel with gas problems in reply to aFORDable, 04-23-2008 19:49:46  
Hello,
the main difference between gas and diesel is the lubricatiating properties, Gas has none. one thing I would do is drain the injection pump that has a roosa pump there should be a window on the side of the pump with two flat blade screws remove the window and let the pump drain out if there is a lot of gas comming out you might have problems. what you discribing sounds like a fuel supply issue but I am afraid your pump might be bad. I don't think the gas hurt the injectors but it could take out the pump rotor head fast. if you have good fuel supply with the change in rpm and loss of power when hot I would say your pump is bad. I would go for a reman exchange pump if you rotor and head are bad the repair cost will be more than the exchange price.
Good luck Ed

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JMS/.MN

04-24-2008 12:20:40




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 Re: 7030 diesel with gas problems in reply to Edpap, 04-24-2008 05:34:52  
Along with no lubricity, a diesel run on gas will run much hotter, and burn up the sleeves and pistons. Neighbor had that happen years ago when the fuel supplier filled the diesel tank with gas. Ended up buying an overhaul after a half-day use.



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