PUMPS

Pumps For Peterbilt Trucks

Peterbilt trucks rely on a range of pumps to circulate fluids throughout the engine, cooling, fuel, and hydraulic systems. The water pump, fuel transfer pump, power steering pump, and oil pump are among the most critical — failure of any one of them can sideline the truck in minutes. We carry replacement pumps for Peterbilt trucks across all major fluid systems and engine families, including water pumps for PACCAR MX and Cummins engines and fuel transfer pumps for common Peterbilt fuel system configurations.

Frequently asked questions about pumps

What are the symptoms of a failing water pump on a Peterbilt diesel?

Water pump failure typically presents as coolant leaking from the weep hole below the pump body — this is by design, as the weep hole provides an early warning that the internal seal is failing before coolant enters the bearing. Bearing failure produces a growling or rumbling noise from the front of the engine that changes with RPM. A slipped impeller causes overheating without visible leaks, which is the most insidious failure mode — if a truck is overheating with full coolant level and no obvious cause, suspect the pump impeller before condemning the thermostat or radiator.

How do I know if my power steering pump is failing on a Peterbilt?

A failing power steering pump typically presents as increased steering effort at low speeds, whining or moaning noise during steering input, and foamy or discolored power steering fluid from aeration or internal wear. Low fluid level from a leak at the pump shaft seal or pressure line fitting can produce the same symptoms — always check fluid level first before concluding the pump itself has failed. A pump that's noisy but maintaining pressure may just need a fluid flush and filter service if the system hasn't been serviced in a long time.

Can I replace a fuel transfer pump in the field on a Peterbilt?

Yes — the fuel transfer pump on most Peterbilt diesel applications is an externally accessible component mounted to the engine block or fuel system module and can be replaced with basic hand tools. Proper procedure involves relieving any residual system pressure, disconnecting fuel lines with the appropriate disconnect tools, and bleeding air from the fuel system after installation. On PACCAR MX engines, refer to the engine service manual for the specific priming procedure after pump replacement to avoid cranking the engine with an air-locked fuel system.

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