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Massey Harris & Massey Ferguson Tractors Discussion Forum
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Fuel gauge

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RSpurling

02-17-2006 07:10:29




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My gauge was not working so I started troubleshooting last night. I replaced the wire running from the gauge to the tank. I noticed the rubber cover at the tank was melted, so I assumed there was a short at some point.

I also noticed there are three connections at the gauge. Two connections are at the mounting bolts (which I re-wired). One connection runs to the alternator. The other runs to the fuel tank. There is also a third connection at the top of the gauge. A small piece of white wire was hanging there. Is this for the illumination light inside the gauge? If not, where do I run this wire? Thanks?

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Aaron Ford

02-19-2006 19:04:01




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 Re: Fuel gauge in reply to RSpurling, 02-17-2006 07:10:29  
Fuel Gauge.... All fuel gauges work similarly. There is a variable resistor in the tank that is operated by the float. The gauge recieves power from the electrical system (alternator in your case) and supplies intermittent 12v to the in-tank unit. The gauge works as a ohmmeter measuring resistance to ground. To test, you should have 12v supplied to the gauge. A test light attached to the other post (and ground)should blink. Grounding this wire should make the gauge swing either from full to empty or empty to full. In either case, it should be exactly opposite of what it reads with the wire disconnected. So if everything works to this point, you are looking at the in tank unit. Use an ohmmeter to check for resistance to ground. Swing the float by hand or fill the tank and the resistance should change. If the gauge reads full when it is disconnected, then there should be more resistance when the float is raised. If the gauge reads empty when disconnected, then the ohms should decrease when the float is raised. If everything checks out, make sure the tank is grounded. Simple check, Aaron

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