7040 fuel question
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=201011
Printed Date: 28 Nov 2024 at 7:35am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: 7040 fuel question
Posted By: INAllis
Subject: 7040 fuel question
Date Posted: 22 Apr 2024 at 2:34pm
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Recently started my 7040 to move it, fired right up and ran peefecr per usual. After several minutes idling it just died instantly. Fuel Guage read about 1/4 and I am 99% it had fuel but I put about 25 gallon s or so in it but filters etc were empty while trying to bleed system realized I was not getting fuel to the filter. Disconnected the hose from auxiliary tank to filter and nothing when held above the frame rail but runs full stream when held lower. Is this line pressurized from the fuel itself or ???. I have blown air back through the hose into the tank and nothing changes I am stumped. TIA
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Replies:
Posted By: DrAllis
Date Posted: 22 Apr 2024 at 3:01pm
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The early 7040's drew fuel up thru a small plastic standpipe to the top of the LEFT tank and then it was plastic line to the fuel filter. Every one I was ever around got changed over to the updated lower hose draw which solved a lot of issues like that.
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Posted By: INAllis
Date Posted: 22 Apr 2024 at 4:15pm
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Yes mine has a rubber hose from auxiliary tank up to the filter housing, I can get a full flow of fuel if I disconnect that hose and hold it level or lower than the outlet of the tank, anything above that.and nothing so absolutely no fuel is getting to the filter or any point beyond that. Am I missing something?? An in tank pump or ??
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Posted By: Lynn Marshall
Date Posted: 22 Apr 2024 at 9:36pm
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Your hand primer pump isn't working correctly. It should pull fuel from the tank, to the injection pump, and keep it there, regardless of the amount in the tank. The plunger seal may be bad or a check valve could be stuck.
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Date Posted: 25 Apr 2024 at 2:17am
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Posted By: INAllis
Date Posted: 25 Apr 2024 at 6:16am
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No progress as of yet, I have ordered a new hand primer and will be trying that as soon as it arrives
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