Farm Equipment - Leaking Fuel Pump

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Leaking Fuel Pump

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=134550
Printed Date: 06 Nov 2025 at 4:50pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: Leaking Fuel Pump

Posted By: McGatha185
Subject: Leaking Fuel Pump
Date Posted: 01 Feb 2017 at 4:45pm

Hey guys, on another post you helped me get my fuel pump on my AC 185 rebuilt. I cleaned it up and put a kit in it because I just can't afford to send it in. Anyways, all has gone pretty well. When starting the tractor the first time it took a lot of pumping on the manual primer to get fuel to the ends of the lines. At one point, to make sure I was getting fuel through the pump at all, I loosened three of the fuel lines on the pump. When I saw fuel come out, I tightened them back up. Soon after it started and runs really good. The problem is that those three lines refuse to seal! Fuel leaks around them badly. Almost like the crush washers were too hard or something. I took my old crush washers and heated them up glowing red and let them cool slowly to soften them. On these three I've replaced the crush washers with these softened ones but they still leak. I also have one fuel line leaking at the injector, though the line is tight. Like I said, the tractor runs really nice. No misses that I can tell, but I'd like to stop the leaking, of course. Maybe I goofed something up and accidentally turned up the fuel pressure or something. I don't know. Any suggestions by you smart guys are most welcome! Thanks!

Also, I understand why they didn't use O rings on these lines because of the pressure, but why can't soft copper or lead washers be used? I would certainly feel more comfortable with the sealing capabilities of a soft lead washer than a steel one.

Replies:

Posted By: DrAllis
Date Posted: 01 Feb 2017 at 5:00pm

Steel washers, not copper. Everything clean on both sides. You probably just don't have them as TIGHT as they need to be.

Posted By: MACK
Date Posted: 01 Feb 2017 at 7:06pm

Any time you take a washer out, throw it away. If that washer crushes too far, the bolt can screw into the rotor far enough to seize the head. MACK

Posted By: Clay
Date Posted: 01 Feb 2017 at 10:30pm

I agree with Mack. I found out the hard way. Once I put on NEW washers, no more leaks.

Posted By: tbran
Date Posted: 02 Feb 2017 at 9:09am

also, if it is leaking at the nozzle, AC has sleeves 74501149 - cut the line righ t behind the sleeve after sliding the nut back. clean the cut - ream the inside and out side to remove any burr or crush install new sleeve. We have repaired many over the year and yes all like are supposed to be the same length - but this will not do any damage.

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