Testing Injectors

Use hand pump, 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/sq. cm).
Disconnect test pump pipe to injector inlet fitting and pump quickly to prime pump and injector. Pump slowly until injector nozzle opens. This must take place at 360-400 psi (25-28 kg/sq. cm) for new injector, and at no less than 260 psi (18 kg/sq. cm) for used injectors.
Again pump slowly to bring pressure to 15-30 psi (1-2 kg/sq. cm) below rating pressure above. Make sure that there is no drip from nozzle within five seconds.
Pump quickly and check that spray is narrow, deep plunging and has good vaporization even at minimum delivery. At a distance of four inches from nozzle orifice, the spray cone delivery should be about 0.8" (20 mm). If injector does not meet these requirements, replace it with a new one.
Use a suitable tool (A.5.0165) to remove injectors.
NOTE: Before testing or removing injectors, the cause of malfunction should unquestionably be attributed to injectors themselves.