Direct Fuel Injection
Page 3B-30 90-8M0050731 MAY 2011
Component or Problem Possible Causes Corrective Action
Air and fuel pressure differential
out of range
Tracker valve Remove/inspect the tracker valve diaphragm for cuts, tears, or
abrasions.
Normal differential is103.5 kPa
(15 psi)
Check the diaphragm seat and rail for damage. Replace
components as necessary.
Fuel regulator Remove/inspect the fuel regulator diaphragm for cuts, tears, or
abrasions.
Inspect the fuel regulator hole for blockage. Clean or correct as
necessary.
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.
Failed fuel injector Inspect the injector O‑ring for nicks, cuts, or abrasions.
Replace the injector as necessary.
Injector stuck open Perform a fuel injector leak test.
Replace components as necessary.
Fuel rail damaged Check for fuel in the air system.
Inspect the offending rail valves and regulators. If all
components check out, replace the rail.
Fuel Management Assembly Removal
!
WARNING
Performing service or maintenance without first disconnecting the battery can cause product damage, personal injury, or death
due to fire, explosion, electrical shock, or unexpected engine starting. Always disconnect the battery cables from the battery
before maintaining, servicing, installing, or removing engine or drive components.
!
CAUTION
Failure to release pressure from the fuel system will result in fuel spraying out, which can cause a fire or explosion. Allow the
engine to cool completely and release all fuel pressure before servicing any part of the fuel system. Always protect eyes and
skin from pressurized fuel and vapors.
!
WARNING
Fuel may still remain in the fuel rails and hoses after draining the vapor separator tank (VST). To avoid a possible fire or explosion,
follow normal precautionary procedures while working with the fuel system. Use a suitable container when draining fuel from
the VST and avoid sparks, smoking, and open flame while in the presence of liquid fuel or fuel vapors.
To Next Page
Loading...
Need help?
General
