Conditions for Setting the DTC

WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

The secondary fuel tank is not empty.
More than 241 km (150 mi) have been accumulated.
The PCM does not detect that the fuel level in the right fuel tank has not changed by at least 3.0 liters (0.80 gallons).
OR
The secondary fuel tank is not empty.
The primary fuel tank is not full.
Engine operating greater than 60 minutes.
The primary tank does not achieve the top of its range. Observe, after operating the engine for greater than 60 minutes the fuel in the right fuel tank will transfer to the left fuel tank.
OR
The secondary fuel tank is empty.
The primary fuel tank is full.
The fuel level in both fuel tanks does not change after traveling more than 284 km (200 mi). Observe, if the secondary fuel tank is empty, the primary fuel level should decrease after 284 km (200 mi).