Conditions For Running DTC

WARNING: This page does not describe the selected car, but rather 13 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Sierra, 2002 GMC Savana Special, 2002 GMC Savana Camper Special, and 2002 GMC Savana. However, it is still accessible from the selected car via links, so may be relevant.

DTCs P0461, P0462, P0463, P1431, P1432, P1433 are not set.
The engine is running.
The vehicle speed is 0 MPH.
The primary fuel level is less than 6.6 gal (25 L).
The secondary fuel level is between .7-2.6 gal (3-10 L).
The above conditions are met for 20 seconds before the secondary pump is commanded ON.
The secondary fuel pump is commanded ON for 120 seconds.