This site is not affiliated with AGCO Inc., Duluth GA., Allis-Chalmers Co., Milwaukee, WI., or any surviving or related corporate entity. All trademarks remain the property of their respective owners. All information presented herein should be considered the result of an un-moderated public forum with no responsibility for its accuracy or usability assumed by the users and sponsors of this site or any corporate entity.
The Forum Parts and Services Unofficial Allis Store Tractor Shows Serial Numbers History
Forum Home Forum Home > Allis Chalmers > Farm Equipment
  New Posts New Posts
  FAQ FAQ  Forum Search   Events   Register Register  Login Login


7040 air in fuel system
 Post Reply Post Reply
Author
Message
  Topic Search Topic Search  Topic Options Topic Options
INAllis View Drop Down
Bronze Level
Bronze Level
Avatar

Joined: 14 Feb 2024
Location: Indiana
Points: 26 		Post Options Post Options   Thanks (0) Thanks(0)   Quote INAllis Quote  Post ReplyReply Direct Link To This Post Topic: 7040 air in fuel system
    Posted: 4 hours 33 minutes ago at 3:01pm
7040 used about once a week or so to load round bales, today lost power lots of smoke, could see air bubbles in fuel filter. Turned off hand primed bled air cracked injector ran great 10-15 minutes and repeat. Pulled this 3 times but got hay loaded, shut down repeat everything fine for short time. Final time hand primer didn't seem to wanna prime, could this be bad and allowing air into system?? If not the cause, im at a loss. Any help? TIA
Back to Top
Sponsored Links


Back to Top
im4racin View Drop Down
Orange Level
Orange Level


Joined: 12 Jun 2017
Location: Garrison ND
Points: 1082 		Post Options Post Options   Thanks (0) Thanks(0)   Quote im4racin Quote  Post ReplyReply Direct Link To This Post Posted: 1 hour 21 minutes ago at 6:13pm
That’s where I would stert
Back to Top
injpumpEd View Drop Down
Orange Level Access
Orange Level Access
Avatar

Joined: 13 Sep 2009
Location: Walnut IL
Points: 5145 		Post Options Post Options   Thanks (0) Thanks(0)   Quote injpumpEd Quote  Post ReplyReply Direct Link To This Post Posted: 1 hour 20 minutes ago at 6:14pm
sounds to me like a fuel flow restriction from the tank.
210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
Back to Top
DrAllis View Drop Down
Orange Level Access
Orange Level Access


Joined: 12 Sep 2009
Points: 22284 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 1 hour 10 minutes ago at 6:24pm
Early 7040's had a plastic fuel supply line from the fuel filter base rearwards to under the cab floor to on top of the main fuel tank. The engineers made the injection pump draw fuel up thru a standpipe. It was a bad idea and oftentimes caused problems like this. Their fix was to go with a larger (than the plastic line) diameter rubber hose from the fuel filter base down and under the tractors belly and tap into the main fuel tank via the cross over hose between the tanks. This bottom draw system was what was needed and all the way thru the mighty 8000 series, that is the way they were. So, if you have the standpipe system, now'd be a good time to just eliminate it and convert to a home made bottom draw design. If you currently have a bottom draw system, disconnect the rubber supply hose at the filter base and hold it down below the fuel tank bottom and see if it GUSHES fuel out the end. It should. If it doesn't, you have a blockage at the outlet of the tank. By the way, if the hand primer squirts fuel all over when you pump it, it's junk.

Edited by DrAllis - 1 hour 10 minutes ago at 6:24pm
Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

Forum Software by Web Wiz Forums® version 11.10
Copyright ©2001-2017 Web Wiz Ltd.

This page was generated in 0.086 seconds.


Help Support the
Unofficial Allis Forum