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Fuel
Accessories
We provide broad support for all aircraft fuel system accessories, from complex units like MECs, FCUs, and HMUs to pumps, servos, and valves.
Precision Fuel System Service
Four Star Accessory Overhaul provides specialized fuel accessory repair & overhaul services in contamination-controlled environments, ensuring the precision and cleanliness critical to reliable fuel system operation across all aircraft types.
Fuel system accessories demand exceptional attention to contamination control and precision tolerances - even microscopic particles can cause valve malfunctions or nozzle blockages that affect engine performance. Our dedicated fuel accessory facilities maintain the clean environments and specialized equipment these components require.
Four Star provides fuel pump overhaul and repair for components that transfer fuel, maintain pressure, and deliver backup power when needed. Each pump is serviced in contamination-controlled environments, where it’s disassembled, ultrasonically cleaned, inspected, resealed, and flow-tested to verify precise pressure and volume delivery. Our process restores reliability, preventing issues like seal wear, bearing damage, and cavitation.
Fuel Control Unit (FCU) Repair
© 2026 Four Star, © 2026 Four Star, We deliver fuel control unit overhaul and calibration for mechanical and electronic units that meter fuel based on throttle, altitude, and temperature. Using engine-simulation test stands, our technicians inspect and adjust linkages, diaphragms, and metering valves, ensuring accurate fuel scheduling and dependable performance from idle to takeoff.
Fuel System Experts
Our experienced technicians have extensive aviation fuel system knowledge and are equipped with precision tools and test equipment to perform comprehensive repair and refurbishment of all fuel accessories.
From MECs and FCUs to pumps and valves, we handle all your aircraft's fuel system needs with expertise and precision.
Our fuel metering valve repair ensures precise fuel flow response to throttle and control inputs. Each valve is cleaned, inspected, resealed, and flow-tested to confirm proper regulation and leak-free performance. Even minor wear or contamination can disrupt combustion efficiency - our precision testing guarantees consistent, stable operation.
Fuel Nozzle Inspection & Testing
We perform fuel nozzle inspection and testing to ensure proper atomization, combustion, and engine efficiency. Using optical and flow bench equipment, we measure spray patterns, flow uniformity, and orifice accuracy.
Aircraft fuel system components overhaul extends beyond pumps and nozzles to include fuel quantity indicating systems, fuel temperature sensors, pressure regulators, shutoff valves, and other accessories. Each component type requires specific inspection techniques, test equipment, and contamination control appropriate to its function.
Our comprehensive capabilities mean operators can consolidate fuel system accessory maintenance with a single provider, simplifying logistics and ensuring consistent quality standards across all component types.
Contamination Control & Validation
Precision fuel system repair and overhaul demand exceptional contamination control. Microscopic particles can cause failure in high-tolerance components.
Technicians wear clean garments, use lint-free materials, filtered solvents, and flush assemblies with clean fuel or test fluids before sealing.
All testing and validation take place on filtered test stands with particle counters and calibrated flow measurement equipment to verify precision performance without introducing contamination. Every component leaving our facility is certified clean, compliant, and ready for return to service. This is a reflection of our commitment to OEM-level quality, rigorous testing, and on-time reliability.
Our Comprehensive
Service Guarantee
Need Expert Support for Your Fuel System?
From fuel control unit calibration to complete MEC overhaul, our certified team is ready to help.
Integrated Fuel System Support
Four Star’s fuel accessory services are fully integrated with our broader aircraft accessory maintenance capabilities, allowing coordinated troubleshooting that identifies root causes rather than isolated component failures.
Our technicians evaluate the entire fuel system,from supply and tank integrity to wiring and pressure regulation, ensuring issues like contamination or corrosion are resolved at the source. For operators servicing multiple accessories, we provide system-level analysis across power generation, pneumatic, and electromechanical systems to detect and prevent recurring faults.
With experience spanning piston, turboprop, and jet engine fuel systems, we deliver the technical insight and reliability operators need across every aircraft platform.
Common Questions
About Fuel Systems
Repair And Refurbishment
