Gas Gauge Question
09-02-2013, 12:33 PM
#1
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Thread Starter
Gas Gauge Question
While I have the dash apart to install a new oil pressure line it is a great time to address the past full reading on the gas gauge. Following the much appreciated Willcox "Fuel Gauge Diagnostic Help 68-76" paper instructions, it appears that the sending unit (SU) is the problem based on the "1" or open circuit reading I am getting when reading across the SU.
While I have access to it, I want to also make certain that the gauge is also functioning properly. Again from the Willcox paper; with the SU disconnected, when I run a ground to the signal input terminal(#1 Stud) on the back of the gauge I get an "Empty" reading. When I ground the "#5" ground stud I get the way past full reading again.
My question is; based on the readings I am getting while testing the gauge, would it be safe to assume it is working properly so I can put the dash back together today while I have the time. I just don't want to wait to put it back together until after I can address the SU problem. If I wait till I can see the gas gauge actually working before I finish the dash, I may never remember where all of those screws go!
While I have access to it, I want to also make certain that the gauge is also functioning properly. Again from the Willcox paper; with the SU disconnected, when I run a ground to the signal input terminal(#1 Stud) on the back of the gauge I get an "Empty" reading. When I ground the "#5" ground stud I get the way past full reading again.
My question is; based on the readings I am getting while testing the gauge, would it be safe to assume it is working properly so I can put the dash back together today while I have the time. I just don't want to wait to put it back together until after I can address the SU problem. If I wait till I can see the gas gauge actually working before I finish the dash, I may never remember where all of those screws go!
09-02-2013, 05:54 PM
#2
Race Director
Label all your screws NOW...while they are still fresh in your memory. If in doubt...wait.
One thing that you may need to be aware of is that I have run into the foam float on the sending unit being heavier than the original factory one. And when I installed it and added fuel...I could see the float in the gas BELOW the surface and hanging about half way. I weighed the new float after taking it out and replaced it with the original due to being a few grams heavier...which was enough to make it NOT float on the surface.
DUB
One thing that you may need to be aware of is that I have run into the foam float on the sending unit being heavier than the original factory one. And when I installed it and added fuel...I could see the float in the gas BELOW the surface and hanging about half way. I weighed the new float after taking it out and replaced it with the original due to being a few grams heavier...which was enough to make it NOT float on the surface.
DUB