fuel guage
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Garden Tractors
Forum Description: A great place to discuss the Simplicity and Allis Chalmers Garden Models
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=186204
Printed Date: 23 Nov 2024 at 4:24pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: fuel guage
Posted By: LaJaMe
Subject: fuel guage
Date Posted: 03 Feb 2022 at 8:41pm
| I replaced my fuel guage on my sunstar. Old one was pegged and not operative. New(used) one pegges out when i turn on the switch and does not go back to zero. Float movement works fine and makes gauge move. Is there anyway to adjust the needle? Appreciate any thoughts Thanks |
Replies:
Posted By: Codger
Date Posted: 04 Feb 2022 at 8:15am
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Your varistor is defective. This is the variable resistor that is on the float arm in the tank. Those gauges require a 33 to 240ohm resistance value to indicate correctly. When the tank if full, the resistance reading will be very near 33 ohms keeping the indicator from "pegging" as you describe. As the fuel level drops the resistance value increases and this reduces current through the indicator winding with the resulting deflection of the needle closer to "E". That said, your fuel tank sending unit is defective.
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Posted By: LaJaMe
Date Posted: 04 Feb 2022 at 7:53pm
| Codger !! I checked the float today. Got readings from 24 to 146. I assume those numbers mean defective ?? Thanks |
Posted By: Codger
Date Posted: 05 Feb 2022 at 5:55am
Yes. Don't run that gauge with power applied and being "pegged" as it will burn the gauge windings open rendering it useless.
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LaJaMe wrote:Posted By: LaJaMe
Date Posted: 06 Feb 2022 at 9:29pm
| Thanks for your input. Not installing the new guage until I get a new sending unit. Thanks again !!! |
Posted By: JC-WI
Date Posted: 09 Mar 2022 at 8:25pm
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Are those varie resistors available? Got two sending units that need them. ------------- He who says there is no evil has already deceived himself The truth is the truth, sugar coated or not. Trawler II says, "Remember that." |
Posted By: Codger
Date Posted: 09 Mar 2022 at 9:55pm
I have not seen that assembly available separately. It is usually not the resistive element that goes bad, but rather the hinge or pivot point the arm swings upon wears out disallowing the "wiper", (moving part) to make good contact with the stationary resistance winding.
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