Disabling factory lift pump

MBusse

MBusse

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Joined
Feb 20, 2007
Messages
498
I recently put the fass from my 01 onto my 06. I didn't have the correct wiring harness so i tapped into the fuse box. I turned off the factory lift pump by unplugging it but now i have no fuel gauge. As far as I can tell there is no fuse or relay for the factory pump. Any ideas on how I can make it so the factory lift pump stays off and i have a fuel gauge?
 
Cut the fuel pump power wire and use it as the trigger for the fass relay, that is what the fass harness does except the fass harness is plug and play.
 
Any idea which wire is power? Dont want to accidentally cut the sending unit wire.
 
Seems to me that it's orange but get out a volt meter and figure it out. There should be 4 wires-12v, ground, 5v, and a sensor return.
 
Does the factory in tank pump allow fuel to be pulled threw it when not in use?
 
You can cut either of the outside wires to disable the pump. The center 2 are for the fuel level sending unit. The one I cut was orange as mentioned above.
 
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