Mazda RX-8 Workshop Manual page 706

Does the fuel pump speed
control operate properly?
20 Inspect the fuel line pressure.
(See FUEL LINE PRESSURE
INSPECTION [13B-MSP].)
Is the fuel line pressure correct?
21 Visually inspect for fuel leakage
at the fuel injector, O-ring and
fuel line.
Service if necessary.
Is the fuel line pressure held
after the ignition switch is turned
off?
(See FUEL LINE PRESSURE
INSPECTION [13B-MSP].)
22 Disconnect the vacuum hose
between the purge solenoid valve
and the intake manifold at the
quick release connector.
Plug the opening end of vacuum
hose.
Attempt to start the engine.
Is the starting condition
improved?
23 Inspect the fuel injectors.
Yes Go to the next step.
Zero or low:
No
Inspect the fuel pump relay and the fuel
pump circuit.
Inspect for clogged fuel line.
High:
Replace the fuel pump unit.
(See
REMOVAL/INSTALLATION
Yes Go to the next step.
No Inspect the fuel injector.
(See FUEL INJECTOR INSPECTION
If the fuel injector is normal, replace the fuel pump unit.
(See FUEL PUMP UNIT REMOVAL/INSTALLATION [13B-
MSP].)
Yes Inspect if the purge solenoid valve sticks open
mechanically.
Inspect the evaporative emission control system.
No Go to the next step.
Yes Go to the next step.
If normal, replace the
fuel pump unit.
(See FUEL PUMP UNIT
REMOVAL/INSTALLATION
[13B-MSP].)
FUEL PUMP UNIT
[13B-MSP].)
[13B-MSP].)