Fuel Pump – GM (85566682)

Fuel Pump delivers fuel from the tank to the rail at the pressure the calibration expects. Output falls off gradually with wear, so the first symptom is usually a lean code or a misfire under load rather than a no-start.

Replace the Fuel Pump when a lean code appears under load, when the engine cranks without starting, or when rail pressure bleeds down overnight. Change the fuel filter with the pump, because the debris that killed one shortens the life of the other.

Ordering reference for the Fuel Pump is part number 85566682, categorised under Fuel Pumps & Senders. Match that number against the component you are removing before you order.

The stock here is genuine GM, and this Fuel Pump keeps the original engineering number, which matters once a number has been superseded more than once.