What action should a technician take if a light duty truck has dual fuel tanks, one OEM and the other an aftermarket tank?

In the scenario where a light-duty truck has both an OEM fuel tank and an aftermarket tank, the recommended action is to find the EO# (Executive Order number) on the aftermarket tank. The EO# indicates that the aftermarket part has been tested and approved for emissions compliance by the California Air Resources Board (CARB). This is important because aftermarket modifications can impact the emissions control systems of a vehicle.

If the aftermarket tank has a valid EO#, it confirms that it can be used safely without compromising the vehicle's emissions performance. Ensuring compliance with emissions regulations is crucial for passing inspections. On the other hand, if the aftermarket tank does not have an EO#, it may lead to a failure during the emissions test. Thus, verifying the EO# on the aftermarket tank allows the technician to proceed correctly based on emissions standards while assessing the compliance of the vehicle.

Addressing the other choices, searching for the EO# on the OEM tank may not be necessary, as OEM parts are generally considered compliant unless they are damaged or modified. Replacing both tanks with OEM parts could be an unnecessary and costly action if the aftermarket tank is already compliant. Lastly, failing the vehicle without further inspection would not be appropriate, as there remains the possibility of the aftermarket