Fuel Injection Pump Rebuilds

Your fuel system is the heart of your diesel engine. MDFI rebuilds and calibrates pumps to factory specifications

We provide complete teardown, inspection, repair, and calibration of diesel fuel injection pumps for all major systems, including Bosch, Stanadyne, Delphi, Denso, Caterpillar and Cummins. Each pump is rebuilt using genuine OEM components and tested on factory-calibrated benches to ensure performance meets or exceeds original specifications.

High quality aftermarket parts are available if needed.

Our rebuild process includes:

Full disassembly and component inspection

Replacement of worn or damaged parts with OEM components

OEM specific calibration and flow testing

Final verification on certified test equipment

MDFI technicians are factory-trained and follow strict OEM standards — no shortcuts, no guesswork.

When a pump leaves our bench, it’s been rebuilt, tested, and verified to perform exactly as it should.

Reliable fuel delivery starts with a precise rebuild — and that’s what we deliver.

Injector Testing & Repair

At Maryland Diesel & Fuel Injection (MDFI), injector testing is done by the book — using certified Industry standard test equipment and OEM procedures to ensure every injector performs like it should.

We service common rail, electronic and mechanical diesel injectors for Bosch, Stanadyne, Denso, Delphi, and other major manufacturers.

Our process includes:

Ultrasonic cleaning and detailed inspection

Electrical resistance and leak-down testing

Flow and return rate measurement & opening pressure

OEM-spec calibration and coding (when required)

Whether you’re troubleshooting a drivability issue or maintaining a full fleet, MDFI provides accurate results, dependable turnaround, and verified performance — not guesswork.

We test them, verify them, and make them right.

All Makes Diesel Parts Sales

At Maryland Diesel & Fuel Injection (MDFI), we don’t just rebuild — we keep your diesel running with the right parts.

We carry and source OEM and high-quality aftermarket parts for fuel injection systems, diesel engines, and related components. That includes:

Fuel injectors and pumps

Seals, gaskets, and rebuild kits

Turbos for light- and heavy-duty diesel engines

Engine rebuild parts and performance components

It doesn’t matter if you need a single replacement part or supplies for an entire shop or fleet, we can get it quickly and reliably.

Call or email us today to check availability and pricing — we ship locally and nationwide.