Professional Fuel System Service

Diagnostics, repair, and cleaning for your vehicle's entire fuel delivery system.

Fuel System Diagnostics & Repair

A clean and efficient fuel system is vital for engine performance, starting, and fuel economy. We service all components, from the fuel pump in the tank to the injectors in the engine. Common services include fuel filter replacement, fuel pump diagnosis and replacement, and qualified fuel injector cleaning. We use fuel pressure gauges and scan tools to evaluate pump performance and injector duty cycle. If your vehicle is hard to start, lacks power, or gets poor gas mileage, a fuel system issue could be the cause.


Fuel Pump Testing and Replacement

A failing fuel pump may whine loudly, cause long cranking times before starting, or lead to a loss of power under load, especially at higher speeds. We test fuel pressure and volume to confirm a pump is failing before recommending replacement. This job often requires dropping the fuel tank, so we take care to safely depressurize the system and prevent fuel spills. We use high-grade replacement pumps to ensure reliability and correct fuel delivery for your engine. Trust us with this critical fix.


Fuel Injector Cleaning Service

Over time, fuel injectors can become clogged with deposits, disrupting their fine spray pattern. This leads to rough idle, misfires, and reduced fuel economy. We offer qualified fuel injector cleaning maintenances that use specialized equipment to flush cleaner through the injectors, dissolving deposits and restoring flow and pattern. For severely clogged injectors, we can send them out for ultrasonic cleaning and flow testing. This maintenance can often restore lost performance and efficiency without the cost of new injectors.

Services We Offer


Optimize Performance and MPG

How we test fuel pumps and clean injectors to restore engine performance and efficiency.

Leonardi Automotive

7426 Redwood Boulevard, Novato, California 94945, USA

(415) 897-1503