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nick121 
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Joined: 13 Apr 2016
Location: ontario
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 Topic: Allis Chalmers 7040 fuel issues
Posted: 22 May 2016 at 8:45pm |
Hi, My Allis chalmers 7040 has been running fine until yesterday when it stalled out while plowing. It started and I kept going and it stall again but I managed to get it to the barn where it finally quit. I ran out and looked and there was air bubbles in the top of the filter which is see through glass. With the hand primer an another person pumping we can pump enough fuel the tractor will start but it runs rough, If you continue using the hand primer it smooths the engine out. The manual mentions the transfer pump is that part of the injection pump? I cant find an inline pump anywhere. Where do I start should I change the filter or all the lines?
Also I have 2 gleaner f2 combines and the have a inline electric fuel pump wired up by the last guy, Maybe I could add one to my tractor? any help would be great
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Orange Blood
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Joined: 29 Nov 2010
Location: ColoradoSprings
Points: 4053
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Posted: 22 May 2016 at 9:08pm |
It sounds like you have an air leak. Look for damp spots on the inlet lines, although they will not always be there, air molecules are smaller than fuel.
The first suspect would be the primer pump, they tend to get hard rubber parts over time, and start leaking. Does it leak like a sieve when you pump it? If so, start by rebuilding it, a cup of coffee bets that is your problem.
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Still in use:
HD7 WC C CA WD 2-WD45 WD45LP WD45D D14 3-D17 D17LP 2-D19D D19LP 190XTD 190XTLP 720 D21 220 7020 7030 7040 7045 3-7060
Projects: 3-U UC 2-G 2-B 2-C CA 7-WC RC WDLP WF D14 D21 210 7045 N7
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SHAMELESS
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Joined: 13 Sep 2009
Location: EAST NE
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Posted: 22 May 2016 at 9:43pm |
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and change the filter too
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nick121
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Location: ontario
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Posted: 22 May 2016 at 9:48pm |
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I will be changing the filet, I can hear air or something when I use the primer pump. The injector pump leaks too but I dont know where and Its always done that. I will try running the tractor from a Jerry can to eliminate the line from the fuel tank. If that doesn't work Maybe I can put a bypass line around the primer pump?
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MACK
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Posted: 22 May 2016 at 9:56pm |
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Filter is the most likely place to suck air, especially if has the glass filter. Also put hose clamps on all hoses from tank to filter. Usually there is a restriction some where that causes one to suck air. MACK
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johnkc
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Posted: 22 May 2016 at 10:56pm |
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My 7040's problem was the rubber line from the tank to engine. It did not leak fuel but sucked air.
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I support the development of hybrid automobiles and alternative fuels as I need DIESEL fuel for my ALLIS CHALMERS!
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nickia
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Posted: 22 May 2016 at 11:31pm |
look under the tractor at the fuel line mine rubbed thru from the plate under the tractor that covers part of the fuel tank sucking air
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Dave in il
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Joined: 22 Sep 2009
Location: Manville Il
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Posted: 23 May 2016 at 9:24am |
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I still carry a primer pump repair kit in my pickup from back when I used 3 7060's and 200 to farm. They don't last forever.
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AGCO My Allis Gleaner Company
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Mgraber
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Joined: 09 Oct 2017
Location: Gillette wy
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Posted: 09 Oct 2017 at 10:34am |
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If the filter sucks air why and how do u fix it. I have been fighting my 7045 allis chalmers for a year now. It will start run for about 30 sec and then u see air bubbles in filter and it dies. I then the primer is shot when u push plunger ther is nothing. Changed the o rings on tube that connects to fuel filter. It rand pretty good one day and next day back to not running.
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nick121
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Location: ontario
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Posted: 09 Oct 2017 at 11:10am |
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hi, I ended up bypassing the primer pump.. Added and electric pump, it isn't wired to run though, just if I need to prime it I can touch the wire to the battery and let the pump do the work. The primer was leaking must have had bad o rings or something.
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MACK
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Posted: 09 Oct 2017 at 10:31pm |
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Replace the glass filter with a spin on filter. If there is a restriction some place it will suck air somewhere, and the filter is the easiest place for it to get air.
Put a vacuum gage in line just before pump. Should not pull more than 4 inches of vacuum, wide open. If it does, there is a restriction some where.
I have never saw a primer pump suck air. MACK
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