Fuel injectors meter fuel into each cylinder. On Caterpillar engines the design changes between mechanical, HEUI, and common-rail families. A unit that looks similar can have a different flow rate, connector, or trim code.
Before you order
- Take the engine serial number, not only the machine model
- Read the number on the injector body if one is still installed
- Note whether the engine is common-rail or HEUI
- Ask if trim files or a calibration update are required after fitment
Mismatched injectors show up as rough idle, high fuel use, or a cylinder that runs hot. If only one cylinder is down, test that circuit before replacing the full set. If several are original and high-hour, a planned set is often cheaper than repeating the job.
We label OEM and aftermarket options separately so you can choose the spec that matches the job and the budget.