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Farmall & IHC Tractors Discussion Forum
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fuel sending units

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Alvin NE WI

08-09-2006 19:11:33




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Got a 986, dual tanks, fuel gauge hasn't been dependable with its readings, tryed a different gauge, didn't help, put in new sending units and it doesn't help, took a voltage reading at sending unit wire and got a reading of 6.6 volts. Is that what it should be? I thought it should be 12.6 just like battery reading. Is there anything to cut the voltage going to the sending units?Any help appreciated. thanks Alvin

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Michael Soldan

08-10-2006 06:17:56




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 Re: fuel sending units in reply to Alvin NE WI, 08-09-2006 19:11:33  
My experience with fuel guages and sending units is mostly automotive but I agree 100% with tractor vet, if the ground for the guage and sending unit is not good the unit/guage won't work. Most fuel guage failure in autos is from faulty ground wire. Good luck...Mike in Exeter Ontario



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Brownie 45

08-10-2006 04:58:14




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 Re: fuel sending units in reply to Alvin NE WI, 08-09-2006 19:11:33  
On the 240, you can get a small 3 terminal voltage regulator which is used in electronic applications that will give you a steady 6 volts regardless of input voltage up to 32 volts. It is a Motorola unit MC 7806 ct. Should be available for less than $2 at most supply jobbers. Postage will probably be more than the unit. Left terminal is volts in positive, middle terminal is gnd[negative], & right terminal is volts out[6 volts].

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GA Dave

08-09-2006 20:26:41




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 Re: fuel sending units in reply to Alvin NE WI, 08-09-2006 19:11:33  
I've been waiting for something on fuel gauges/sending units to surface. I was, before retiring because of health problems, a non restricted state licensed electrical contractor class II and unrestricted low voltage contractor (no TOOT TOOT intended). Nothing I ever studied had to do with tractors or cars. Always indrustial. I take notes and remember that John T is a electrical engineer but might have been on the bigger end also?. Question. I changed my IH 240U to 12 volts negative ground and would like to get the fuel gauge working after the restoration. I have checked the ballast resistor out and don't think that will even come close to putting six volts on the gauge. I would think I need a small ? OHM resistor inline to the gauge from the 12 volt battery. I'm open to any suggestions. I've been using the old standby hickory stick and it never lies. GA Dave.

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the tractor vet

08-09-2006 19:24:13




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 Re: fuel sending units in reply to Alvin NE WI, 08-09-2006 19:11:33  
They can be a pain in the donkey to get working as they both have to work together or they don't work as far as voltage i can not tell ya off had as i have never took a reading on them . If it works when full and when the top tank is empty it goes to empty the the bottom tank sender is the problem , now it may be a ground that is giving ya trouble so check for good grounds.



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