Fuel Pump Spring

The MOROSO Fuel Pump Spring (Part Number 65770) is a heavy-duty replacement spring engineered for Holley electric fuel pumps operating at 19 PSI. This natural steel spring maintains consistent pressure regulation, ensuring reliable fuel delivery to carburetor and fuel injection systems across a wide range of engine configurations and driving conditions.

Constructed from high-grade steel, this 19 PSI spring is calibrated to deliver precise pressure control in electric fuel pump assemblies. The spring's natural finish resists corrosion while maintaining tension integrity over extended operation. At just 0.02 lbs, the spring's minimal weight contributes nothing to system complexity—its role is purely functional: to regulate diaphragm movement and establish the target 19 PSI threshold that Holley pump systems require for optimal carburetor bowl fill rates without overflow or starvation.

This spring is essential for street rods, classic muscle cars, and retrofit fuel system builds where a Holley electric pump replaces mechanical fuel delivery. Users performing fuel system maintenance, pump rebuilds, or pressure regulation diagnostics will find this replacement spring as a critical wear item. Fuel pump springs experience fatigue over thousands of thermal cycles; a weakened or fatigued spring causes pressure drop, lean carburetor operation, and potential fuel starvation during acceleration. MOROSO's engineering ensures consistent spring rate retention, meeting the OEM specification for Holley pump pressure relief.

Compatible with Holley electric fuel pumps across multiple models and years, this spring is sold individually to support single-pump replacement or full system service. Proper fuel pump spring selection is critical—incorrect pressure ratings result in fuel delivery errors upstream of the engine. MOROSO's precision manufacturing ensures this spring meets pressure tolerance requirements for reliable, predictable fuel system operation in street, strip, and show vehicle applications.