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MF35 fuel guage

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garvas

09-14-2002 13:59:31




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I have a 35 that I would like to get the gas guage to work. Is there a way to test the gauge and float before I buy them? A freind said to bypass the wire from the float and touch the battery and this would test the gauge. Sounds like a quick way to trouble. Any help??




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d3 Mike

09-14-2002 16:20:21




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 Re: MF35 fuel guage in reply to garvas, 09-14-2002 13:59:31  
First check for power at a post on the guage, the other post should run to the sender. Remember that the engine needs to be running if it's a diesel. If this checks out, then GROUND the sender wire. The guage should read full. If it doesn't move, then smack it good, they often stick. if this fails, replace the guage. If the guage works when the sender is grounded,the sender is bad. If your tractor has been sitting around and the sender is bad, don't replace it untill you run a couple of tanks of fuel,as it may come back. Good luck, Mike

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David

09-14-2002 16:09:14




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 Re: MF35 fuel guage in reply to garvas, 09-14-2002 13:59:31  
The fuel gauge is a voltmeter that will read full when it has 12 volts across it so connecting the gauge across the battery voltage should test it. If you connect the wires the wrong way round the needle will try to move below "empty" rather that towards the full end of the scale. Provided you only connect them incorrectly momentarily it is unlikely to cause a problem. If the needle doesn't try to move at all the gauge isn't working. To test the sender unit a multimeter that reads resistance or volts makes the job easy. Without one you first have to establish whether there is any power getting to the unit. A 12v bulb onto each terminal of teh sender unit turn with other wire from the bulb to the metal of the tractor will tell you a lot. Tractor battery and all wiring should be connected for this. Battery With the sender in "Full" position you should get almost 12v at both terminals. As it goes towards empty the voltage on the "output" terminal should drop and bulb should glow dimmer. If it does this, its working properly. A quick first check is to do a continuity check across the terminals of the unit. This will tell you whether the wiring inside is intact. If it isn't the unit is most likely knackered or at least in need of an internal clean of its moving parts. Its a remote possibility that's its just not getting a good contact if it has lain without fuel neear it for some time. Personally, I never like to buy a new item unless I can see the fault with the old one and will dismantle things to to confirm that there's a fault actually there. Sometimes you discover that its fixable even if its nominally a sealed unit.

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d3 Mike

09-14-2002 16:35:36




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 Re: Re: MF35 fuel guage in reply to David, 09-14-2002 16:09:14  
I just read Davids post. If you put 12 volts to the sender side it will ground through the sender and burn it up! If you are gas, the tank could ignite-explode. Look at the circut. It is a 1 wire circut to the sender, the only thing the sender can do is ground the circut. DON'T POWER IT UP!!!!! Mike



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David

09-17-2002 14:02:32




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 Re: Re: Re: MF35 fuel guage in reply to d3 Mike, 09-14-2002 16:35:36  
Oops. Mike is quite right. Sorry guys.



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