OTC 4200 Diesel Injector Nozzle Tester

SKU: OTC4200
UPC: 731413001888
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OTC 4200 Diesel Injector Nozzle Tester

Here is the ultimate tool for diagnosing a number of problems that affect diesel fuel injector nozzles.

OTC Pressure Tester Features:

The Nozlrater tester enables you to check for leakage, pop-off pressure, spray pattern, and chatter. This tool will accommodate a wide range of injectors. We also offer adapters so you can troubleshoot nozzles used in popular automotive, agricultural, and construction engines. Nozlrater features a rugged, lightweight reservoir that holds 7/10 of a gallon of fuel. It is equipped with a replaceable 2-micron filter. The large, dual-scale, high-pressure gauge is protected by a guard and includes an indicator needle to record maximum pressure reached. The tester is light enough to be easily carried for field use. Or you can bench-mount it, using the holes in its base. Not designed for Cummins or Detroit injectors. 


Overall Width


Overall Length (includes handle)


Overall Height


Weight (empty)

15 lbs., 10 oz.

Max. Pressure

5000 p.s.i. (350 bar)

Max. Reservoir Capacity

.692 Gallons of diesel fuel (160 cu. in.)

Usable Reservoir Capacity

.628 Gallons of diesel fuel (145 cu. in.)

Outlet Port

For 3/8" tube


Calibrated 0-5000 p.s.i. (350 bar). Has 3½" dial
face with maximum reading indicator needle.

Gauge Connection

¼" NPT female

Stroke of 1/2" Diameter Piston


Volume Per Full Stroke

.147 cu. in. (2.4 cc)

Intake Filter

2 Micron

No. 4200 – Nozlrater diesel injector nozzle tester.  5000 PSI maximum pressure capacity.  Wt., 15 lbs., 10 oz.

Optional Kits: OTC4201OTC4202

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OTC Warranty