Farm Equipment - 200 fuel problem

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200 fuel problem

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=19553
Printed Date: 08 Feb 2025 at 4:55am
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Topic: 200 fuel problem

Posted By: AdamsSoIL
Subject: 200 fuel problem
Date Posted: 17 Oct 2010 at 11:02am

i'm having trouble with the 200 running right. i have good flow from the fuel tank, new filters. it starts good and runs good for about 30/45 secs. it then acts like the fuel shut off is pushed half way in. revs up slow and little to no smoke. what do you guys think ?

Replies:

Posted By: DougG
Date Posted: 17 Oct 2010 at 1:19pm

Check all the fittings on the fuel line , there should be rubber seals at the flanges on a 200 , make sure they are all good , I had a bad rubber seal once , it would start and run but always had a slight miss; then it maybe the Return lines plugged and the retainer ring is breaking up in the injector pump ; I,ve heard they are cheap and easy to put in , but I havent had one break up yet ; I,ve had the Roosa pumps apart already and they are simple , but have to be calibrated at a fuel shop

Posted By: DrAllis
Date Posted: 17 Oct 2010 at 2:42pm

Remove the short return hose from the top cover of the injection pump. Now remove the nipple that the hose was attached to that is threaded into the pump cover. Gently grind away the "crimp" that is holding the flatwasher in the threaded end and pry out the washer and remove the glass ball and spring( and throw them away) and blow out all the junk that is inside this fitting so it is clean. Re-install it and reconnect the hose. If it is now running as well as it should, it needs an injection pump overhaul, which would include replacement of the governor flex ring. You can use it as-is for a short time, but pump repairs are in the near future.

Posted By: JoeO(CMO)
Date Posted: 17 Oct 2010 at 2:52pm

My 185 was running badly, the same as you described.

Follow Dr. Allis's instructions to the letter! You will be going in a matter of minutes.

I only ran my 185 about 25 hours after performing the procedure, pump is off now, just haven't taken it the re-builder yet, oh, and it didn't heal itself.

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Posted By: Mike NEIN
Date Posted: 17 Oct 2010 at 7:27pm

I've had this problem on my 210 and took off the fuel cap and that solved it.

Posted By: injpumpEd
Date Posted: 17 Oct 2010 at 7:47pm

very common on Roosa pumps, to have flex ring break down, then the pieces plug the return, resulting in engine dying, and/or low power. A very quick and easy way to find out if this is the problem, take the timing window cover loose, and let it run. If it continues to die, or barely run, you have a fuel tank/line problem. If it runs normal, then flex ring. Time for a pump rebuild. I do these all the time. Dr has good advice, but only thing I dont like about that is having an open fitting in the return, now lets the flex ring pieces flow to the tank, as well as people forgetting to fix the pump right since it now runs perfect with the check ball knocked out, until the rivets shear off, and cause a run-away. good luck, Ed.

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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!