Chery A1 2009 - Page 329

Observe the following fuel pressures when testing:
FUEL PRESSURE
Key On 350 kPa (3.5 bar)
Key Off 330 kPa (3.3 bar) in 10 minutes
Engine Idle 350 kPa (3.5 bar) - 370 kPa (3.7 bar)
Fuel System Troubleshooting Chart
CONDITION POSSIBLE CAUSES CORRECTION
No Start/Hard Start/Start and then
Stall
· Contaminated fuel
· Low fuel pressure
· Restricted fuel filter
· Fuel pump relay inoperative
· Restricted or leaking fuel lines
· Fuel pressure regulator
· Drain, flush and refill fuel system.
· Check fuel pump pressure.
· Replace fuel filter.
· Test fuel pump relay.
· Inspect/replace necessary fuel
line(s), perform fuel system air
purge.
· Inspect/replace the fuel pump if
necessary.
Stalls Under Aggressive Maneuvers/
Loss Of Fuel Pressure
· Restricted or damaged fuel filter
· Contaminated fuel
· Damaged fuel tank
· Replace fuel filter.
· Drain, flush and refill fuel system.
· Replace fuel tank.
Cannot Refill Fuel Tank/Excessive
Pressure in Fuel Tank When Cap is
Removed
· Sticking or damaged fuel tank
fill/vent valve, hose or lines.
· Inspect, repair vent hose and lines,
replace fuel tank.
Fuel Pump Troubleshooting Chart
CONDITION POSSIBLE CAUSES CORRECTION
Symptoms of a Defective Fuel Pump
· Noisy operation
· Poor acceleration
· Failure to start (starting difficulties)
· Replace the fuel pump
Reasons For Fuel Pump Failure
· Accumulated contaminants causing
an insulation layer
· Fuel pump bushing and armature
blocked
· Eroded fuel level sensor
components
· Replace the fuel pump
Fuel Injector Troubleshooting Chart
CONDITION POSSIBLE CAUSES CORRECTION
Symptoms of a Defective Fuel
Injector(s)
· Poor idling
· Poor acceleration
· Failure to start (starting difficulties)
· Replace the fuel injector(s)
Reasons For Fuel Injector Failure
· An accumulation of contaminants
inside the injector due to lack of
maintenance
· Clean injectors regularly with an
approved method
DIAGNOSIS & TESTING
04–10
Chery Automobile Co., Ltd.