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#1
06-01-2015, 10:13 AM
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Left side of the tank is larger, but the right side of the tank get filled first and the extra gas spill over into the left tank side. The transfer pump is always running as long as the engine is running so the left side of the tank tank is constantly filling the right side of the tank and any extra gas once the right side of the tank is filled is spilled back into the left side of the tank.
The problem is when the transfer pump is not working so the right side tank is not filled with gas from the left side, but the fuel pump is on the right side, so all the gas in the right side eventually is used up, but the left side still have gas.
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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD 
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#2
06-01-2015, 07:29 PM
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Re-reading my post, it may not have been clear.
Yup, the smaller fuel pump side gets filled first, around 25liters IIRC. Excess spills over the hump to left side. Fuel flow starts from right tank, to fuel rail, then to return line discharging to the left tank. But eventually most of the fuel ends up on the left when I monitor the OBC. It seems the left tank always has more fuel than the right tank with these two X's, and it seems the OP's X is the same?
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04 X5 3.0i auto 03 X5 4.6is
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