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INAllis 
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Joined: 14 Feb 2024
Location: Indiana
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 Topic: 7040 air in fuel system
Posted: Yesterday at 3:01pm |
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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
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im4racin
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Joined: 12 Jun 2017
Location: Garrison ND
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Posted: Yesterday at 6:13pm |
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That’s where I would stert
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injpumpEd
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Joined: 13 Sep 2009
Location: Walnut IL
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Posted: Yesterday at 6:14pm |
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sounds to me like a fuel flow restriction from the tank.
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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!
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DrAllis
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Joined: 12 Sep 2009
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Posted: Yesterday at 6:24pm |
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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 - Yesterday at 6:24pm
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Lynn Marshall
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Joined: 13 Sep 2009
Location: Dana, Iowa
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Posted: Yesterday at 9:47pm |
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If it does have the gravity flow system, then the hose from the tank should have an adapter and elbow at the filter base. They have been known to plug with debris at that area. May need nothing more than a fuel filter change.
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INAllis
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Location: Indiana
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Posted: Yesterday at 9:51pm |
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New fuel filter about 6 weeks ago but haven't ruled it out. Tank about 3/4 fuel. Will continue to check lines thank you
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INAllis
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Posted: Yesterday at 9:53pm |
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Runs perfect for an amount of time, you can literally watch air bubbles form in the filter until it smokes horrendously
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Les Kerf
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Location: Idaho
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Posted: Yesterday at 10:15pm |
 INAllis wrote:
Runs perfect for an amount of time, you can literally watch air bubbles form in the filter until it smokes horrendously |
I have a diesel tractor doing exactly that, I need to pull the tank and clean the gunk out; pulling the sediment bulb and poking a wire up through the wire was insufficient but it did make it able to drive it back to the shop.
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DrAllis
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Joined: 12 Sep 2009
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Posted: Yesterday at 11:12pm |
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Check the flow from the disconnected hose FIRST. If OK, then move on to the filter base connections/base inlet being plugged. Then, the filter itself.
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injpumpEd
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Joined: 13 Sep 2009
Location: Walnut IL
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Posted: 14 hours 35 minutes ago at 8:51am |
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Just a quick note, the primer leaking when pumping it is not always an indication it will allow air intrusion, the end of the plunger blocks the hole to seal it off when it's held in the housing with the bail and screw. The rubber does get hard and brittle eventually though. Even a new plunger can leak a little fuel when pumping it, but still should seal up the system when bottomed.
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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!
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8070nc
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Joined: 21 Mar 2019
Location: North Carolina
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Posted: 12 hours 36 minutes ago at 10:50am |
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One fellow ikniw has a 8050 that did that. Wound up getting a rubbervglove out of the tank. Another fellow had. 1566 that did that. It was a golf ball. That ball would get sucked iver the outlet and after it cut the fuel off it would roll off and the tractor would start right back up. I know niether one of those is your problem you hav similar symptoms. Could be something in the tank is getting sucked over the outlet and when flow stops it releases and it will start again after priming
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1984 80780
1957 D14
DES 300 with 25000 engine
616 tractor
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