What Midwest Fuel Injection makes

Midwest Fuel Injection is a diesel remanufacturer and service specialist. Its work is fuel pumps, fuel injectors, and turbochargers, taken from worn or failed cores and rebuilt to run again, rather than newly cast parts. The Bolingbrook, Illinois plant is the founding division of the Seidel Diesel Group and specializes in VP-44 and common-rail injectors alongside the full range of mechanical and electronic pump and injector lines. The company remanufactures common-rail, HEUI, EUI/EUP, mechanical, CRI/CRIN, and piezo injectors, and rebuilds Garrett, Holset, BorgWarner, IHI, Mitsubishi, and Cummins turbochargers.

The application list runs the length of the diesel market: Dodge/Cummins 5.9 and 6.7, Ford and International 6.9/7.3 and 6.4, GM 6.2/6.5 and Duramax 6.6, plus Caterpillar, John Deere, Mack, New Holland, Perkins, Volkswagen, and most other OE pumps and injectors. End uses span pickup trucks, medium- and heavy-duty Class 8 trucks, RVs, commercial and city fleets, fire trucks and ambulances, school and city buses, construction and agricultural equipment, generators, and marine engines. A core part of the service is diesel injector testing: buyers can have injectors tested at any of the group's US locations before deciding to replace them, which is the diagnostic front end of a remanufacturing workflow rather than a parts counter.

Remanufacturing process and equipment

The center of the operation is a Bosch-process clean room, opened at the Bolingbrook headquarters in September 2013, built to rebuild common-rail injectors to controlled-contamination standards. Remanufacturing diesel injection is close-tolerance work: modern common-rail injectors meter fuel at pressures above 30,000 psi, and rebuilding them to hold calibration is why the company runs the Bosch procedure and a dedicated clean environment rather than a general repair bay. The plant pairs the clean room with injector and pump test benches used both for warranty rebuilds and for the pre-replacement testing service.

Alongside injection work, the company rebuilds turbochargers across the major OE brands and, through the wider Seidel Diesel Group, became a master distributor of Honeywell Garrett turbochargers. The reman model matters to buyers on cost and lead time: a rebuilt pump or injector set returns a truck to service faster and cheaper than sourcing new OE parts, which is the argument the company makes with its "too frugal to buy cheap" positioning, that a properly remanufactured unit is the value play against both new OE and low-grade imports.

Ownership and history

Geret Seidel founded the business in January 1981, opening the first Midwest Fuel Injection shop in Orland Park, Illinois, and his son Ben Seidel co-built the group over the following four decades. A second Illinois shop opened in Palatine in 1993, and in June 2005 the headquarters moved to a purpose-built facility at 1 Seidel Court in Bolingbrook. The company grew mainly by acquiring regional diesel shops: Illinois Valley Diesel Injection Service in Peru, Illinois in 2008, and Vans Fuel Injection in Marion, Iowa in 2009, which gave Midwest Fuel Injection its four Midwestern locations. Parallel acquisitions on the coasts became the group's Metro, Pacific, and International Fuel Injection brands.

In July 2023, the Seidel Diesel Group was acquired by M&D, bringing five divisions and 10 locations under the new parent. The company continues to operate under the Midwest Fuel Injection name from Bolingbrook. Published leadership includes Paul Thoms, who joined the Orland Park shop as manager in 1992, rose to general manager in 2010 and vice president in 2012, and was named President in January 2016; Ben Seidel, co-founder; and Michael Frantz, Director of Operations. Gavin Docherty manages the Bolingbrook branch. Group-wide, the company reports more than 150 employees across 12 to 13 locations.

Certifications and quality

The Bolingbrook location holds ISO 9001:2015 and ISO 14001:2015 certification, and the company states it was among the first businesses in the country to implement the 2015 revisions of both standards. It is a Bosch 4-Star authorized diesel service center, the top tier of Bosch's authorized-service program, which is the credential behind its Bosch-process injector rebuilds. In July 2022, Midwest Fuel Injection earned Manufactured Again certification, the reman-industry standard administered by MERA that audits a remanufacturer's process against defined quality criteria. The company also cites Advanced Diesel Specialists training and long-standing membership in the Association of Diesel Specialists.

Known customers

Midwest Fuel Injection sells into the diesel repair channel rather than to named OEM production programs, so it does not publish a customer roster, which is normal for an aftermarket reman shop.

The honest read is a broad, fragmented customer base: commercial and municipal fleets, truck and equipment dealers, independent repair shops, and owner-operators who send in cores for rebuild or buy remanufactured exchange units. That profile is typical of the aftermarket diesel service segment and is a different sourcing relationship than a Tier 1 running OEM programs.

Sourcing evidence

Midwest Fuel Injection has no US ocean-import record: a search of customs bill-of-lading data returns no shipments under the company or the Seidel Diesel Group name. That absence is consistent with the business model. A remanufacturer's primary input is used cores collected domestically from fleets and repair shops, supplemented by OE components and rebuild kits bought through domestic distribution, so it does not appear as a direct ocean importer the way a parts manufacturer would.

Coverage caveat: customs bill-of-lading records capture US ocean-freight imports only. Air, truck, and rail movements, domestic core collection, and purchases through domestic distributors do not appear, so absence of a customs record is not evidence of low activity, it is the expected footprint for a domestic diesel reman operation.

Frequently asked questions

What does Midwest Fuel Injection make?

Midwest Fuel Injection remanufactures diesel fuel pumps, fuel injectors, and turbochargers, and provides diesel injector testing. It rebuilds common-rail, HEUI, EUI/EUP, mechanical, and piezo injectors, VP-44 and common-rail pumps, and turbochargers from Garrett, Holset, BorgWarner, and other OE brands, covering Cummins, Ford/International, GM Duramax, Caterpillar, John Deere, and most other diesel platforms.

Who owns Midwest Fuel Injection?

Midwest Fuel Injection is the founding division of the Seidel Diesel Group, which was acquired by M&D in July 2023. The business was founded in 1981 by Geret Seidel and built into a multi-location group with his son Ben Seidel before the acquisition.

Where is Midwest Fuel Injection located?

Midwest Fuel Injection is headquartered at 1 Seidel Court, Bolingbrook, Illinois 60490, which is also the Seidel Diesel Group headquarters. Midwest Fuel Injection operates four Midwestern locations, including Bolingbrook, Palatine, and Peru in Illinois, and the wider group runs 12 to 13 locations across the United States.

What certifications does Midwest Fuel Injection hold?

The Bolingbrook facility holds ISO 9001:2015 and ISO 14001:2015 certification and is a Bosch 4-Star authorized diesel service center. Midwest Fuel Injection also earned Manufactured Again certification in July 2022, the MERA remanufacturing quality standard.

How long has Midwest Fuel Injection been in business?

Midwest Fuel Injection has operated since January 1981, when the first shop opened in Orland Park, Illinois. It has run continuously for 45 years, moving its headquarters to Bolingbrook in 2005 and joining the M&D group in 2023.

Who are Midwest Fuel Injection's customers?

Midwest Fuel Injection serves the diesel aftermarket rather than named OEM programs: commercial and municipal fleets, truck and equipment dealers, independent repair shops, and owner-operators across on-highway, off-highway, agricultural, marine, and power-generation markets. It does not publish a named customer list.

Last verified September 28, 2026. Is this your company? Request a correction.