7040 fuel filter keeps filling with air bubbles
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=180914
Printed Date: 18 Jul 2025 at 8:35pm
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Topic: 7040 fuel filter keeps filling with air bubbles
Posted By: jazzsuds
Subject: 7040 fuel filter keeps filling with air bubbles
Date Posted: 01 Jun 2021 at 1:08pm
| I start my 7040 without any air bubbles in the fuel filter and run it about 30 minutes and then air bubbles appear at the top of the filer and then the tractor stalls out. I wait 5 minutes and the air bubbles go away and she starts ok and runs for anothe 10 minutes and the problem occurs again. Any ideas folks? |
Replies:
Posted By: DrAllis
Date Posted: 01 Jun 2021 at 1:19pm
| Something blocking outlet to the fuel tank. Bad/loose fuel supply hose. Old 7040's had a standpipe that they drew fuel up and out of the top of the tank. Surely by now it has been changed over to the bottom draw system ?? where is connects to the hose that crosses over from left tank to the right tank. |
Posted By: jazzsuds
Date Posted: 01 Jun 2021 at 1:40pm
| Thanks for the reply. I only have the one tank. |
Posted By: DrAllis
Date Posted: 01 Jun 2021 at 6:13pm
| So where does it draw fuel?? If it is bottom draw, disconnect the supply hose at the filter base and hold it down below the side frame. It better GUSH fuel. If not, it's plugged between there and the tank. If it gushes fuel the blockage may be in the filter base itself. Remove filter and blow backwards thru the filter base with the fuel supply hoses unhooked and clear the slug. |
Posted By: jazzsuds
Date Posted: 01 Jun 2021 at 6:20pm
| Thank you I will try that |
Posted By: MACK
Date Posted: 01 Jun 2021 at 9:21pm
| I have found almost every thing in bottom feed line, from bugs to a red grease rag. MACK |
Posted By: GM Guy
Date Posted: 21 Jun 2021 at 12:38am
|
good chance the hose is getting dry and cracked, might need a new hose. O-reilly usually carries bulk 5/8 hose. ------------- Gleaner: the properly engineered and built combine. If you need parts for your Gleaner, we are parting out A's through L2's, so we may be able to help. |
Posted By: jazzsuds
Date Posted: 21 Jun 2021 at 10:17am
| Thanks gents for all your help, you rock!!!! |
Posted By: jazzsuds
Date Posted: 20 Mar 2022 at 3:43pm
| From the top |
Posted By: MACK
Date Posted: 20 Mar 2022 at 8:12pm
| If it feeds from top, get a hose kit to draw from bottom. MACK |
Posted By: DaveKamp
Date Posted: 24 Mar 2022 at 9:37pm
Dangit, Mack, that was my favorite, I was wondering where it slipped off to... Can I have it back?  I was working on a traction inverter (a big box full of electrical stuff, under a subway train)... when I found a class ring.... With a finger still attached...  ------------- Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest. |
MACK wrote:Posted By: DiyDave
Date Posted: 25 Mar 2022 at 4:44am
There's a pun in here somewhere, but I just can't put my finger on it...  ------------- Source: Babylon Bee. Sponsored by BRAWNDO, its got what you need! |