Direct Fuel Injection
Page 3B-28 90-8M0050731 MAY 2011
Component or Problem Possible Causes Corrective Action
Fuel pressure and air pressure are
both
low
Air compressor Provide 80 psi of shop air to the air rail test (Schrader) valve.
Inspect the air compressor for leaks. Leaking air through the
compressor indicated bad reeds.
Inspect for broken reeds.
Remove the air compressor cylinder head and inspect the
cylinder wall and piston for scuffing.
Replace components as necessary.
Air compressor inlet Inspect the compressor air inlet for blockage, kinks, or tears.
Clean, correct, or replace components as necessary.
Starboard rail air inlet
hose
Inspect the air inlet hose to the starboard rail for blockage,
kinks, or tears.
Clean, correct, or replace components as necessary.
Fuel pressure and air pressure are
both
low
Starboard to port rail air
transfer hose
Inspect the air transfer hose from the starboard to port rails for
blockage, kinks, or tears.
Clean, correct, or replace components as necessary.
Tracker valve Remove/inspect the tracker valve diaphragm for cuts, tears, or
abrasions.
Inspect the diaphragm seat and rail for damage. Replace
components as necessary.
Direct injector Injector may be damaged or stuck open. Perform a resistance
check or leak test to determine cause.
Check O‑ring for nicks or cuts.
Fuel pressure and air pressure are
both
low
Air regulator Provide 80 psi of shop air to the air rail test (Schrader) valve.
(This should be the last
component to check/
remove)
Visually inspect the air regulator cover. If air is escaping through
the small hole, the regulator is faulty. Replace the port fuel rail.
If necessary, remove/inspect the air regulator diaphragm for
cuts, tears, or abrasions.
Inspect the diaphragm seat and rail for damage. If the air
regulator is faulty, replace the port fuel rail.
Air rail test (Schrader)
valve
Damaged valve. Replace the valve with an Air Valve Kit.
Fuel pressure is low or fuel
pressure drops while running
Tracker valve Remove/inspect the tracker valve diaphragm for cuts, tears, or
abrasions.
Air pressure remains normal Inspect the diaphragm seat and rail for damage. Replace
components as necessary.
Check the air system for fuel contamination.
Fuel hoses Inspect the fuel hoses for blockage, kinks, or tears.
Clean, correct, or replace components as necessary.
Fuel regulator Remove/inspect the fuel regulator diaphragm for cuts, tears, or
abrasions.
Inspect the diaphragm seat and rail for damage. If the fuel
regulator is faulty, replace the port fuel rail.
Check the air system for fuel contamination.
To Next Page
Loading...
Need help?
General
