fuel light problem need help!

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johnny8462

Active member
Joined
Jul 14, 2009
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27
I have a 05 12R and the fuel warning light stays on all time even when i have a full tank. Can anyone help me out or point me in the right direction?
 
The first thing I would check is the wires being worn in the fuel pump itself - this isn't uncommon in '06's but I'm not sure about the '05's.
If the low fuel wire wears through the low fuel light will come on, if the fuel pump power wire wears through the fuel pump fuse will blow and if the fuel pump control wire wears through the pump will constantly prime with the ignition on / engine off.
You can measure the sensor line to ground on the pump connector (it is the pin corresponding to the yellow/red wire in the loom). The fuel pump body is grounded. If the wire is worn through this reading would be close to zero ohms.
This link has a guide to removing the fuel pump:

http://www.buellxb.com/Buell-XB-Forum/Buell-Firebolt-XB12-XB9/Help....
 
Could be, but you should be able to measure that with an ohmmeter as with the worn wire.
One thing you could try is to disconnect the fuel pump electrical plug and turn the ignition on. If the low fuel light is still on then the low fuel wire is grounded somewhere or the instrument cluster itself is at fault.
If the light doesn't come on then it is being grounded somewhere in the fuel pump assembly and that is either a wire worn through or the sensor failed.

I haven't come across one but that doesn't mean they don't fail - the spare listed for my '06 is P0789.K.
 
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