How to Test a Leaking Fuel Injector
- 1). Attach the sections of copper tubing to the pressure value with the flare fittings.
- 2). Insert the Schrader valve into one end of the 4-foot length of PVC tubing and secure with a mini hose clamp. Attach the second end of the tubing to one of the copper tubing ends and clamp in place.
- 3). Slide one end of the fuel line over the free end of the copper tubing attached to the pressure value and clamp in place. Attach the second end of the fuel line to the fuel injector and clamp.
- 4). Attach the pump to the Schrader valve and fill the system with 40 to 60 psi of air pressure.
- 5). Spray the injector tip with the soapy water solution. If bubbles occur the injecting in leaking. If bubbles do not occur wait 10 minutes to see if the pressure gauge reading decreases, indicating a leak in the test system. Check all fitting with the soapy water solution to find the leak. Tighten, re-pressurize the system and reapply the solution to the injector.
- 6). Remove the injector from the test assembly and clean with fuel injector cleaner and a small brush. Retest. If it still shows signs of leaking the injector should be replaced.
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