Why does a truck lack power and fail to accelerate when refueling?

[LaReese]

If a vehicle exhibits symptoms of poor acceleration, there can be numerous underlying causes. For instance, the clutch disc may not be engaging properly, the engine may be over-fueled, or there could be an oxygen sensor malfunction. Below are more detailed explanations: 1. Most trucks are equipped with manual transmissions: Manual transmissions have a clutch system where the clutch pressure plate is mounted on the engine flywheel, and the clutch disc transmits power when pressed tightly by the pressure plate. If the clutch disc fails to engage fully, it will slip during acceleration, preventing complete power transfer to the transmission, resulting in sluggish acceleration. 2. There are two oxygen sensors: One is located at the end of the exhaust manifold, and the other at the end of the catalytic converter. The oxygen sensors monitor the oxygen content in the exhaust gases. They send signals to the ECU (Engine Control Unit), which adjusts the air-fuel ratio based on these signals. If an oxygen sensor is faulty, it may fail to send accurate signals to the ECU or provide incorrect feedback.