Spica Fuel Injection: Adjustments: Testing: Injectors
- Use tester, like that for testing Diesel injectors, but supplied with gasoline and provided with a pressure gauge with a top reading of 700-1000 psi (50-70 kg/cm2 ).
- Disconnect test pump pipe to injector inlet fitting and pump quickly to prime pump and injector. Pump slowly until injector nozzle opens. Injector must open at 360-400 psi (25-28 kg/cm2 ) for new injector, and at no less than 260 psi (18 kg/cm2 ) for used injectors.
- Again pump slowly to bring pressure to 15-30 psi (1-2 kg/cm2 ) below injector opening pressure. Make sure that there is no drip from nozzle within 5 seconds.
- Pump quickly and check that spray is narrow and has good vaporization even at minimum delivery. At a distance of 4 inches from nozzle orifice, the spray cone should be about 0.8" (20 mm). If injector does not meet these requirements, it must be replaced.