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Christ · 04-18-2010, 11:13 PM

Ben -

The "GM standard" for most of their fuel sending units is a simple signal between 0-90 ohms resistance in a pot-controlled circuit. As the fuel sending unit's level sensing arm goes up, impedance increases (maybe... could be the other way) and the needly thingy rises in the gauge.

Maybe if you put a controlled 40 ohm signal to it (at 12VDC) it will read ~1/2 tank? Couldn't hurt to try?

04-18-2010, 11:13 PM	#1372 (permalink)
Christ Moderate your Moderation. Join Date: Nov 2008 Location: Troy, Pa. Posts: 8,919 Pasta - '96 Volkswagen Passat TDi 90 day: 45.22 mpg (US) Thanks: 1,369 Thanked 430 Times in 353 Posts	Ben - The "GM standard" for most of their fuel sending units is a simple signal between 0-90 ohms resistance in a pot-controlled circuit. As the fuel sending unit's level sensing arm goes up, impedance increases (maybe... could be the other way) and the needly thingy rises in the gauge. Maybe if you put a controlled 40 ohm signal to it (at 12VDC) it will read ~1/2 tank? Couldn't hurt to try? __________________ "¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"