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Posted by: JimN73 Jun 8 2015, 02:44 PM

The gas gauge used to read right, not anymore. When full, the reading is a little over 3/4. The gauge and the reserve light appear to be in sync, reading empty and coming on when there is about 4 gallons left.

I have verified that the resistance in the sending unit is within spec. I have no resistance between the tank connection and the ground. I have cleaned the connections on the tank, the gauge and the fuse.

Am I missing something or could there be a problem with the gauge?

Thanks

Posted by: Mike Bellis Jun 8 2015, 02:46 PM

Have you measured voltage and resistance at the gauge? Or did you only test the sender? Bad connections and loos connections and corrosion are other factors in the wiriing.

Posted by: JimN73 Jun 8 2015, 04:32 PM

Mike, I only tested the sender and the wires to the sender and ground - for resistance.

Battery voltage (12 volts+) to the gauge? Where would the resistance check be?

thanks.

Posted by: Ferg Jun 8 2015, 04:38 PM

Pull the sender on the tank. I've seen corrosion on the wires/rods keep the float from moving up and down freely. There is a pelican article on how to disassemble it to see.

http://www.pelicanparts.com/techarticles/911_fuel_tank_sender_replace/911_fuel_tank_sender_replace.htm

Posted by: Dave_Darling Jun 8 2015, 04:51 PM

If the reserve light is coming on with 4+ gallons in the tank (double-check that!!) then your float seems to not be floating so well. Might be time to replace it.

--DD

Posted by: forrestkhaag Jun 8 2015, 05:34 PM

or pop it open and carefully clean the trash out of the sender barrel then put it back together and check it out / sound like the same thing mine was doing before I can-opened it and cleaned the sliders and float action. All is well and works perfectly after a few delicate moments of cleaning with a Qtip glued to a clean chopstick and some Acetone to gently clense the wires therein.

In any case, it is worth a try before biting the bullet on a new sender.

Posted by: JimN73 Jun 8 2015, 05:43 PM

thanks, I see a busy day tomorrow.

Posted by: toolguy Jun 8 2015, 05:56 PM

My daily driver does the same every 4-5 years. . the trouble is caused by deposits from today's crappy gas coating the windings of the sender. . the easy fix is to add Chevron Techrone injection cleaner to a FULL fillup. . May take 2 successive treatments but it works. .

Posted by: JimN73 Jun 8 2015, 06:18 PM

I'll try this first.

Posted by: AlanG Jun 8 2015, 06:19 PM

Been there. Done that. Got the t-shirt.

Posted by: JimN73 Jun 9 2015, 11:13 AM

One tank of gas, one bottle of techron, one mile of driving - one gauge that works. It's a murracle.

thanks, Toolguy

Posted by: ripper911 Jun 9 2015, 11:45 AM