Fuel guage problems
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Junior User
Joined: Jun 2003
Posts: 92
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From: Montana
Fuel guage problems
I replaced a fuel pump and sending unit in the front tank of a 1990 F150 4x4 w/ 5.8L with a junkyard unit. The problem is that after I installed it, the fuel guage pegged out over the full mark and stays there even when I switch to the rear tank (which worked fine prior to changing the pump) The front tank is empty and the rear has maybe 1/4 tank of fuel. Both tanks pump fuel fine, just do not read on the guage correctly. What is the likely problem? Thanks in advance for any help!
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
An open circuit.
High resistance = high reading.
Maybe a bad selector switch on the dash or open wires to both sending units.
Who knows, it could also be a bad gauge or two bad sending units.
/
High resistance = high reading.
Maybe a bad selector switch on the dash or open wires to both sending units.
Who knows, it could also be a bad gauge or two bad sending units.
/
Thread Starter
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Junior User
Joined: Jun 2003
Posts: 92
Likes: 0
From: Montana
Thank you for the reply, Subford. It turns out that it was the selector switch for the tanks. I replaced the switch today and now the guage works properly for both tanks. Thanks again for the reply and diagram.
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