(3) High pressure leak test
Fuel injector may contain residual fuel oil and can emit a high pressure
jet of fuel oil from spray tip when bumped. Always hold injector so that tip
will spray away from skin. Fuel oil which enters blood stream may cause
(a) Place fuel injector (37) in injector
test fixture (38).
Compressed air used for cleaning purposes will not exceed 30 psi. Use
only with effective chip guarding and personal protective equipment
(goggles/shield, gloves, etc).
Thoroughly dry injector with
Check fuel connections for leaks.
If leaks have occurred, tighten
connections, dry injector, and
With injector rack in FULL FUEL
position (fully depressed) and popping
handle (39) locked in downward
position, operate pump handle (40) to
build up and maintain pressure.
Pump up injector tester and
maintain pressure of 1600 to
2000 psi. Inspect for leaks at fuel
connector gaskets, injector body
plugs, and injector nut seal ring.
(a) Place fuel injector (37) in injector test
Place injector rack in FULL FUEL position (fully depressed).
Operate pump handle (40) to build up slight pressure (10 psi minimum) in system.
Pop fuel injector several times with popping handle (39). Observe spray pattern emitted
from fuel injector spray tip. If spray tip does not produce uniform pattern, dirty or
damaged spray tip orifice is indicated.