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The fuel pump control module of the 2008 Toyota Tundra is positioned beneath the vehicle, close to the fuel pump assembly. In order to access it effectively, you should lift the Tundra with a jack and secure it on jack stands before working underneath the truck. It is important to prioritize safety measures when dealing with both the electrical and fuel systems, as you will be handling both in this situation. Replacing the control module can be costly (around $250 for the parts), so it is advisable to test the voltages first to confirm if it is the root of the issue. You can refer to instructional videos on platforms like YouTube for guidance on how to conduct this test, which can be done with the assistance of another person, a digital multimeter, and a few basic tools.
It is typically found on the PCM, but it may also be a separate module.