Fuel Injector Nozzle Leak Test

CAUTION: Do not place your hands or arms near the tip of the nozzle when testing the nozzles. The high pressure atomized fuel spray from a nozzle has sufficient penetrating power to puncture flesh and destroy tissue. This may result in blood poisoning. Always enclose the nozzle tip in a receptacle, preferably transparent, in order to contain the spray.

IMPORTANT: Injector Nozzle Opening Pressure and Leakage tests should only be performed on nozzles with high mileage, engines that have been over heated, or on vehicles that pull heavy loads. False or inaccurate readings can occur if the following test are not performed to the above criteria.

1. Open the shut-off valve at the pressure gage (1 turn).
2. Blow dry the nozzle tip.
3. Depress the lever of the manual test stand slowly until the gage reads a pressure of 95 bar (1400 psi). Observe the nozzle tip. A drop may form on the end of the nozzle but should not drop off within a period of 10 seconds.
4. Replace the nozzle assembly if a drop falls during the 10 seconds.