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H3 Dozer

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=14144
Printed Date: 27 Jul 2025 at 1:16am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: H3 Dozer

Posted By: Ricky D
Subject: H3 Dozer
Date Posted: 20 Jun 2010 at 9:10pm

Wondering if anyone can help me find a place that would rebuild a fuel pump from an H3 gasser or where I could find a rebuilt one. The one I have pumped so much pressure that it collapsed the brass float bulbs in the carb. Must be a relief valve stuck or ?????

Ricky D

Replies:

Posted By: dadsdozerhd5b
Date Posted: 20 Jun 2010 at 9:23pm

fuel pump pressure would not collapse the float. the needle would stop the flow first or the extra gas would come out of the breather hole or into the manifold. the floats must have been damaged form an earlier cleaning or something. search e-bay for parts or post a pic on here to see if anyone has one. good luck

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HD5B, HD5G, (2) FARMALL A's, CUB. DO IT RIGHT THE FIRST TIME, IGNORE THE LAUGHTER. FLANNEL IS ALWAYS IN STYLE.

Posted By: CTuckerNWIL
Date Posted: 21 Jun 2010 at 2:17pm

Some of the Oliver guys have put electric fuel pumps on the OC crawlers in place of mechanical pumps. I've seen collapsed floats caused by water in the bowl. It will freeze around the float and crush it. I guess better that than breaking the bowl.

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Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF

Posted By: JoeO(CMO)
Date Posted: 21 Jun 2010 at 4:29pm

I am completely in agreement with CTucker on this, I just replaced a float in a D17IV, it was caved in and had fuel level issues and available from supply houses. It works good now.

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Posted By: Ricky D
Date Posted: 21 Jun 2010 at 9:12pm

We had just finished putting a carb kit in the carb, cleaned it up and put it back together. Started it up & couldnt get it to stop flooding itself, lots of black smoke. Took carb apart again and floats were colapsed and gas all over, running out of intake.

Posted By: Kipn
Date Posted: 22 Jun 2010 at 10:35am

Those fuel pumps are an assist to the gravity feed. I don't think they are capable of putting out more than 5 lbs pressure. It will run without it on level ground. The D15 does and doesn't have a fuel pump. Gas flooding was because of the float condition. Float condition was because of.........? Something missing in this story. Replace the float.

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1961 H3

Posted By: Ricky D
Date Posted: 22 Jun 2010 at 6:50pm

We repaired the floats by melting the solder off the pin hole and inflating with air pressure and soldered them back up. Put it together, bypassed the fuel pump, and it runs fine with gravity feed. We've done many carbs but have never had this happen, what am i missing? By the way, float was fine when we put the carb kit in. We checked the float height & all seemed to be fine. ?????

Oh, one other thing - there was pressure at the carb when we loosed the line from the pump, gas squirted out under pressure, quite a bit of pressure. Again - it works now without the pump.

Posted By: CTuckerNWIL
Date Posted: 22 Jun 2010 at 7:12pm

Try hooking a pressure gauge up to the fuel line and see what the pump does.

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http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com
Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF

Posted By: Kipn
Date Posted: 23 Jun 2010 at 9:51am

As CTuckerNWIL says, put a pressure gauge on it. Supposed to be about 3-5lbs. Did somebody else replace the fuel pump with the wrong one? Pretty sure my pump only has one inlet and one outlet, no bypass. I have never seen a mechanical fuel pump build to much pressure, only not enough. Again, we are all missing something here because what you are saying is that a 5lb mech fuel pump broke and now is pumping 50 lbs.??

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1961 H3