Help! Fuel Light Glows w/ New Sending Unit
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Help! Fuel Light Glows w/ New Sending Unit
I installed a NEW Toyota fuel sending unit 2 weeks ago.
(honestly wasn't that difficult with near empty tank)
Fuel gauge works perfectly now
NOW: The low fuel light just barely glows always...you can't even see it during the day unless you look very carefully, it's so faint.
My guy @ Toyota suggested a bad ground (tank is grounded @ the pump housing only) so I added a great ground to a screw on the pump housing this weekend.
Zero change.
Ideas?
Defective unit?
Maybe junk in the tank?
Bad wire connection somewhere?
Think I need another ground wire directly to the sending unit housing?
Thanks, all!
(honestly wasn't that difficult with near empty tank)
Fuel gauge works perfectly now
NOW: The low fuel light just barely glows always...you can't even see it during the day unless you look very carefully, it's so faint.
My guy @ Toyota suggested a bad ground (tank is grounded @ the pump housing only) so I added a great ground to a screw on the pump housing this weekend.
Zero change.
Ideas?
Defective unit?
Maybe junk in the tank?
Bad wire connection somewhere?
Think I need another ground wire directly to the sending unit housing?
Thanks, all!
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I wonder if it isnt in your speedometer assembly. Is there a crack letting light in from another source or from one of the other bulbs? Is it bright at night when the headlights are on?
I am fairly sure thew Fuel Light is an option. Does the replacement have a 3 wire plug? The ones without the Low Fuel Light is only a 2 wire plug.
Here is the difference. Round plugs are for the 86 and older but you can see the number of wires and the differences of the option on the Sending Unit. The Bulb at the bottom of the unit is what triggers the light. Just because you install the 3 wire unit, it has to be wired in the main harness.
Low Level Light Option and plug differences.
I am fairly sure thew Fuel Light is an option. Does the replacement have a 3 wire plug? The ones without the Low Fuel Light is only a 2 wire plug.
Here is the difference. Round plugs are for the 86 and older but you can see the number of wires and the differences of the option on the Sending Unit. The Bulb at the bottom of the unit is what triggers the light. Just because you install the 3 wire unit, it has to be wired in the main harness.
Low Level Light Option and plug differences.
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Thanks, Terry.
The sensor was purchased new from Toyota based on the VIN.
And, yes, it was the 3-prong with the green outer just has you have shown...matched the one I pulled out.
(The fuel gauge was completely dead when I bought the truck. Works perfect now.)
I did think about maybe it was light from a neighboring bulb, but I can see the glow when all lights are off...even just with the key to "on" regardless of whether the engine is running or not.
The sensor was purchased new from Toyota based on the VIN.
And, yes, it was the 3-prong with the green outer just has you have shown...matched the one I pulled out.
(The fuel gauge was completely dead when I bought the truck. Works perfect now.)
I did think about maybe it was light from a neighboring bulb, but I can see the glow when all lights are off...even just with the key to "on" regardless of whether the engine is running or not.
Last edited by 87runner_; 09-08-2015 at 04:39 PM.
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Maybe I'll run a ground wire directly to the sending unit, too...just to cover all bases.
I seem to recall seeing a writeup to test the connection somewhere but can't find it again.
I'll keep y'all posted.
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