CAT 7C-4567 Fuel Transfer Pump – Consistent Flow Delivery and Cavitation Resistance for 3406E and Early C15 Fuel Systems
1. Product:7C-4567
2. Compatible Equipment: Diesel Fuel Injection Systems
3. Manufacturer: Aftermarket OEM Replacement
4. Condition: Brand New, Fully Tested
5. Origin: ABOSEDE Diesel
6. Shipping period: 3-5 business days
7. Payment terms: T/T, Western Union, PayPal
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Product Introduction
In the architecture of a diesel fuel system, the high-pressure pump often receives the most attention, but its performance is fundamentally limited by the fuel supplied to it. The transfer pump-also known as the lift or supply pump-is responsible for delivering a consistent flow of fuel from the tank to the high-pressure pump. If the transfer pump's flow is inconsistent, the high-pressure pump cannot maintain stable rail pressure, leading to injection timing errors and power loss. The CAT 7C-4567 is a positive-displacement transfer pump designed to deliver a steady flow of 120–140 litres per hour at 4–6 bar, ensuring that the high-pressure pump operates with a stable inlet pressure. The result is a more consistent injection event across the entire operating range.
Cavitation Resistance – The Silent Enemy of Transfer Pump Longevity
Cavitation occurs when the pressure at the pump inlet drops below the fuel's vapour pressure, causing bubbles to form and collapse violently against the pump's internal components. This erosion gradually destroys the pump's internal clearances, reducing its flow capacity and causing the high-pressure pump to starve for fuel at high load. The 7C-4567 is engineered with a larger inlet port and an optimised impeller design that reduces the pressure drop at the inlet, minimising cavitation even when the fuel is warm or when the fuel filter is partially restricted. The impeller is also manufactured from a cast-iron alloy with a surface hardening that resists cavitation erosion.
Flow Stability – The Key to Consistent Rail Pressure
The 7C-4567's positive-displacement design ensures a flow rate that is directly proportional to the engine speed, with a deviation of less than 3% across the operating speed range. This stability means that the high-pressure pump receives a predictable fuel supply, allowing it to maintain the rail pressure within the ECM's target window. In tests, the 7C-4567 maintained a flow deviation of ±2.5% over 5,000 hours, compared to ±6% for pumps with a simpler vane design.