Farm Equipment - 7020 Fuel System

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7020 Fuel System

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=200582
Printed Date: 02 Dec 2024 at 10:52pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: 7020 Fuel System

Posted By: CDN 400
Subject: 7020 Fuel System
Date Posted: 28 Mar 2024 at 10:22am

Is there a check valve somewhere inline? This thing will fire about once then you have to crank and crank to get it lit. I removed the fuel after sitting and its half empty and the fuel line to the filter head from the tank was drained back to the level of fuel in the tank.

Replies:

Posted By: tbran
Date Posted: 28 Mar 2024 at 10:36am

The hand pump serves as a check - it has two check valves in it - IF the rubbers in the plunger are loose and the inlet check valve has a piece of trash in it or doesn't seat - bingo. To see - let it set - THEN pump it up before starting and then see if it cranks and dies. Some 7020's had a low pressure electric pump installed...they have failed and also pump air in the system on occasion - 40 + years old...... anything can happen from hardened sleeves seals in the line nut to pin holes..

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When told "it's not the money,it's the principle", remember, it's always the money..

Posted By: CDN 400
Date Posted: 28 Mar 2024 at 11:09am

Thanks thats what I needed to know. I'll take it off and tear it apart and see what I find.