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bmwforeman, BMW Technician
Category: BMW
Satisfied Customers: 212
Experience:  bmw factory trained since 2000 current shop foreman
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2003 Z4..approximately 7 gallons (14.2 gal tank)..fuel gauge..more gas

Customer Question

I have 2003 Z4 when fueling the tank will only take approximately 7 gallons (14.2 gal tank) and the fuel gauge is at one half. I've tried to put more gas in but the tank seems to be full. Any suggestions?
Submitted: 7 years ago.
Category: BMW
Expert:  bmwforeman replied 7 years ago.
Good morning- SOunds like one of the level sensors is not working.The design of the fuel tank is called a saddle tank.It basically has two sections that hold fuel,so it needs two sensors.When one sensor fails the gauge only sees one sensor therefore,1/2 tank,even when both sides are full.There are ways to confirm this using test steps in the instrument cluster,also removing the suspect sensor and checking the resistance.Hope this helps.