Starving for fuel
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Construction and other equipment
Forum Description: everything else with orange (or yellow) paint
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=97200
Printed Date: 17 Jul 2025 at 7:54pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Starving for fuel
Posted By: tterrt
Subject: Starving for fuel
Date Posted: 01 Nov 2014 at 1:27pm
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Recently purchased a maroon belly 7040 which had been sitting for eight years. It starts and runs great while it is just off Idle. When I turn up the throttle, it will begin to miss and die out. The sellers filled the fuel tank. The fuel smells good, replace the filter twice, and I have been told that has wax in the fuel lines. Added a fuel treatment, but same results. Is there a common place where wax builds in the lines??
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Replies:
Posted By: DiyDave
Date Posted: 01 Nov 2014 at 5:58pm
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I'd start looking as far away from any heat source as possible. Dump a can of Diesel 911 as per directions, into the tank. Don't put too much of it in, though, as an over dose of it gives the same symptoms. Also check that the injector return line to the tank isn't kinked or blocked...
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Posted By: DMiller
Date Posted: 02 Nov 2014 at 7:52am
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I would look for elbows, screens or any other choke points on the fuel feed lines, wax doesn't usually 'settle' out to clog things. Then there is the potential for the fuel system to be sucking air if there is a restriction, does it have a inline or rotary head injection pump? The Stanadyne pump could be failing if it is the rotary head style.
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Posted By: injpumpEd
Date Posted: 05 Nov 2014 at 12:46pm
This should be in the farm equipment section, you'll get much more input. Try to run it out of a temporary fuel jug/can right to the inlet of the injection pump. Just make sure you're using good, clean fuel, since you'll not be filtering it. The Stanadyne DM rotary pump has a transfer pump in the inlet of it, so it can pull fuel from your temporary tank. If it runs right hooked up like this, add the next component, like the final filter. Just keep working your way back, adding components until you have the problem again. If it doesn't run right with the temporary tank, disconnect the return line, and let it run into a separate can. If it runs right, then the issue is on the return side. Still not running right, then it's a pump or injector issue. These issues can be difficult to diagnose, but with a little plumbing engineering, you can find the problem, and fix it right.
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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!
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Posted By: HD6GTOM
Date Posted: 05 Nov 2014 at 4:57pm
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wax doesn't build up in the fuel system unless the temp is down around 35 degrees. It will build up in the filters before it does in the line. you might remove the fuel cap and blow air back thru the lines. Make sure you are not blowing back thru the filters or a pump of some sort. What micron filters are on the tractor. I think they called for 10 micron. they made a 5 micron filter that was hard to get fuel thru.
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