Diesel Injectors

Is your diesel hard to start, idling rough, or smoking more than usual? Worn injectors can be one of the causes. We stock diesel injectors for Chevrolet Duramax, Dodge Cummins and Ford 7.3L, both remanufactured stock injectors and Premium Plus versions.

How diesel injectors work

The injectors spray diesel into the cylinder under high pressure. Spray pattern and quantity affect combustion, smoke, power and fuel consumption. Wear or clogging can cause rough idle, hard starting or misfires, but the same symptoms can have other causes. So it is a good idea to have the injectors tested before you replace them. You will find other types among all our fuel injectors.

How to choose diesel injectors

The starting point is engine code and model year, not just the make. Injectors are typically split up very precisely, e.g. at DDP, where Cummins 5.9L 2003-04 and 04.5-07 each have their own injector, and where Duramax LB7, LLY and LMM have their own part numbers. Keep in mind:

• Stock or upgraded: A stock injector replaces the original. Check the product description for flow. Increased fuel delivery typically requires tuned software, and you should keep an eye on exhaust gas temperature.
• Single or set: Some injectors are sold individually. If you only replace one, it should match the others so the cylinders work evenly.
• Brand: Besides DDP, the category includes Industrial Injection, Exergy and BD Diesel, among others.

Installation and maintenance

Cleanliness is essential, because dirt in the high-pressure system can quickly damage new injectors. Use new seals and sealing washers, tighten to the manufacturer's torque spec, and check whether the engine requires injector codes to be programmed. Replace the fuel filter and drain the water separator regularly. Water and contaminants in the diesel are among the typical causes of wear.

Frequently asked questions

What is the difference between a remanufactured and a new diesel injector?

A remanufactured injector, e.g. a DDP Reman Injector, is a used injector that has been disassembled, inspected and tested with new wear parts. Which parts are replaced and how the injector is tested depends on the manufacturer, so read the product description.

Do all injectors need to be replaced at the same time?

Not necessarily. If only one injector is faulty, it can be replaced on its own. If the injectors are already worn, a complete set can give more even combustion. Have the cylinder balance measured before you decide.

Do upgraded injectors affect inspection and road approval?

They can. Injectors that change fuel delivery and power can affect smoke, emissions and the vehicle's approval. Whether the modification requires registration or inspection depends on the product and the vehicle, so check this for the specific part number before installing.