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
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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