AC 7080 fuel filter change ??
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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=180772
Printed Date: 22 Aug 2025 at 3:55am
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Topic: AC 7080 fuel filter change ??
Posted By: twinson
Subject: AC 7080 fuel filter change ??
Date Posted: 26 May 2021 at 12:40pm
 I changed the fuel filter on the 7080 (square filter) How do I get the fuel from the tanks into the filter? The hand primer has pressure behind it and is very hard to pump? Does the injection pump create the suction to get the fuel from the tank in the the filter? It seems like the hand primmer only pushes fuel into the injection pump? Is this correct? Are there instructions for this somewhere? Diesel is not really my thing, just trying to gets Dads 7080 running again. The engine cranks but will not fire. |
Replies:
Posted By: steve(ill)
Date Posted: 26 May 2021 at 1:23pm
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James, i am not that familiar with that particular setup, buy sometimes when you pump the primer you pressurize air into the filter and injection lines... Some tractors, you have to open the throttle, open the fuel shut off ( in the cab). then crack on injector line out of the pump or at the injector... as you pump you get air out. WHen you see a constant fuel flow, you tighten the line and it should start. ------------- Like them all, but love the "B"s. |
Posted By: twinson
Date Posted: 26 May 2021 at 1:29pm
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Thank you, I'll give that a try. Jim |
Posted By: injpumpEd
Date Posted: 26 May 2021 at 4:34pm
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If it's been sitting, the plungers in the pump are very likely stuck. You might get it to start pumping if the fuel isn't too nasty. Fuel in the last 15 years has a very short shelf life. ------------- 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! |