Fuel Pump

Function

Stable, uninterrupted fuel supply at the correct pressure is a prerequisite for consistent atomisation and flame quality. A worn or cavitating pump causes pressure fluctuations that produce flame instability, incomplete combustion, and elevated fuel consumption per tonne of asphalt produced. Below-threshold supply pressure also triggers flame safeguard shutdown, stopping production and requiring manual reset. The fuel pump is a low-cost component relative to the downtime it can cause if neglected.

Construction & quality

Pump body: close-grained cast iron or ductile iron; pump gears: lapped alloy steel, case hardened for fuel compatibility and wear resistance. Shaft seal: mechanical seal or lip seal rated for the fuel type and temperature. Integral pressure-relief valve, factory-set to the required burner supply pressure. Suction and delivery connections: BSP or NPT screwed, or PN16 flanged. Motor: foot-mounted TEFC electric motor, direct-coupled or V-belt driven, 0.75–7.5 kW. Heating jacket on HFO pumps: welded mild steel, rated for steam or electric trace heating.

When to replace

• Burner supply pressure consistently below the set point despite the inlet strainer being clear
• Noisy pump operation — whining, knocking, or cavitation sound not present at commissioning
• Fuel leakage at the shaft seal evidenced by wet or stained pump casing and fuel odour
• Flame instability or frequent safeguard lockout trips at a constant feed rate
• Abnormal motor current overload indicating a seized or heavily worn gear set