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Old 08-22-2012, 12:30 PM   #1
ImprezaTypeR
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Default fuel gauge not working/gas light on

i just finally got my car up an running an driveable, its a 2000 rs with a 05 wrx swap. i have a few trouble shoots to take care of still, an this is my main one. the fuel gauge was working before i got my harness merged an since i changed the fuel pump which works an put the harness back in, my fuel gauge isnt working an the lights on. i gotta constantly keep putting gas in to make sure i dont run out....

any ideas? input or anything would be helpful. even if someone can tell me the exact locations on the harness to look for then i can go back an look it up to see if i can manage to fix it. someone also told me my floater could be stuck which doesnt make sense to me. but i dont know what it could be.
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Old 08-22-2012, 01:20 PM   #2
ImprezaTypeR
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bump for some nasioc knowledge
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Old 08-22-2012, 04:37 PM   #3
Cougar4
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If the wire harness going to the fuel pump and float mechanism was changed out then you should get the wiring diagram for it so you can check the wires between the gauge and the fuel tank. Most likely there has been a misconnection made somewhere. If you haven't checked the fuses already you should do that. You should also have a meter to check the wiring with.
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Old 08-23-2012, 08:42 AM   #4
ImprezaTypeR
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no just the harness under the dash was changed. the connection where it disconnects to the fuel pump was never touched, but i also changed my stock fuel to a wrx fuel pump. i can hear the fuel pump working tho when its low on gas.
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Old 08-23-2012, 11:33 AM   #5
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Check to see if the gauge is getting voltage to it. Also, did you verify the fuse to the gauge is ok?
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Old 08-23-2012, 02:13 PM   #6
ImprezaTypeR
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well the gas light is on, does that mean any good?
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Old 08-23-2012, 02:15 PM   #7
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Quote:
Originally Posted by ImprezaTypeR View Post
well the gas light is on, does that mean any good?
Hey, everyone is telling you to check with a meter.

Guess that means you should check with a meter.
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Old 08-23-2012, 05:02 PM   #8
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Quote:
Originally Posted by ImprezaTypeR View Post
well the gas light is on, does that mean any good?
The light is on a seperate circuit from the gauge so it doesn't really mean much, for the gauge at least. You need to see if the sender is getting voltage to it and make sure the lead to it isn't shorted to ground.
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Old 08-24-2012, 06:47 AM   #9
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Quote:
Originally Posted by jonthesloth View Post
Hey, everyone is telling you to check with a meter.

Guess that means you should check with a meter.
everyone? im talking to the same one guy on here..
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Old 08-24-2012, 06:48 AM   #10
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Quote:
Originally Posted by Cougar4 View Post
The light is on a seperate circuit from the gauge so it doesn't really mean much, for the gauge at least. You need to see if the sender is getting voltage to it and make sure the lead to it isn't shorted to ground.
im confused a little on where the sender is located. then i can start from there at least. what am i looking for?
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Old 08-24-2012, 08:48 AM   #11
JMSok8
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your sending unit is under the rear seats on the opposite side of the fuel pump. If you look at the fuel pump cover, look for another cover that is more of a triangle shape. that is your sending unit.
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Old 08-25-2012, 12:31 AM   #12
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o ok thank you
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Old 08-25-2012, 12:07 PM   #13
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can we get some pix up here? maybe a little more help, im looking at it now an im still confused why this isnt working, i pulled the pump out the floater is working. but still no sign of the gas light going off or the gauge going up. ughhh this is to difficult, im not that good when it comes to dealing with electrical problems on vehicles but know very little.
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Old 08-25-2012, 07:57 PM   #14
ImprezaTypeR
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nevermind i finally figured it out, does changing the floater to my rs floater mechanism work, cuz it fixed the problem... jus not sure if the gas level might be off or anything.
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Old 09-23-2012, 07:52 PM   #15
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What was the issue, what fixed it?!
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Old 09-24-2012, 12:58 AM   #16
ImprezaTypeR
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the floater bobber thingy was bad on the wrx fuel pump but i switched it with my rs floater, but i noticed when its completely full it sits above the F, an when my gas light goes on its sitting on a little less then a half tank.
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Old 09-24-2012, 10:57 AM   #17
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The sender unit you used might not be the same resistance as the original unit so that would change the calibration scale of the gauge if that is true. The low fuel level warning lamp should turn on when there is only a few gallons left in the tank. The position of the sensor inside the tank is critical for it to work correctly.
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