Repair Instructions; Fuel Pressure Inspection; Fuel Pump Inspection - Suzuki RMX450Z Service Manual

1G-3 Fuel System:

Fuel Pressure Inspection

WARNING
!
• Keep away from fire or spark.
• Spilled gasoline should be wiped off
immediately.
• Work in a well-ventilated area.
Inspect the fuel pressure in the following procedures:
1) Remove the fuel tank bolt and unhook the rubber
band. Refer to "Fuel Tank Removal and Installation"
(Page 1G-5).
2) Place a rag under the fuel feed hose (1) and remove
the fuel feed hose (1).
1
3) Install the special tools between the fuel pump and
fuel delivery pipe L-joint.
Special tool
(A): 09940–40211 (Fuel pressure gauge
adapter)
(B): 09940–40220 (Fuel pressure gauge
hose attachment)
(C): 09915–77331 (Meter (for high
pressure))
(D): 09915–74521 (Oil pressure gauge hose)
(A)
(D)

Repair Instructions

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IA02J1170001-01
(B)
(C)
IA02J1170002-02
4) Turn on the ignition and check the fuel pressure.
Fuel pressure
Approx. 294 kPa (2.94 kgf/cm
If the fuel pressure is lower than the specification,
check for followings:
• Fuel feed hose leakage
• Fuel pump
If the fuel pressure is higher than the specification,
check for the followings:
• Fuel pump
5) Remove the special tools.
WARNING
!
Before removing the special tools, turn off
the ignition switch and release the fuel
pressure slowly.
6) Reinstall the removed parts.
NOTE
Connect the fuel feed hose to the fuel pump
and fuel delivery pipe L-joint until it locks
securely (a click is heard). Refer to "Throttle
Body Construction" in Section 1D (Page 1D-
12).

Fuel Pump Inspection

Turn on the ignition switch and check that the fuel pump
operates for a few seconds.
If the fuel pump motor does not make operating sound,
inspect the fuel pump circuit connections or inspect the
fuel pump relay and TO sensor. Refer to "Fuel Pump
Relay Inspection" (Page 1G-4) and "DTC "23" (P1651-H/
L): TO Sensor Circuit Malfunction" in Section 1A
(Page 1A-53).
If the fuel pump circuit connections and TO sensor are
OK, the fuel pump may be faulty, replace the fuel pump
with a new one. Refer to "Fuel Pump Removal and
Installation" (Page 1G-6).
2
, 42psi)
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