Repair Instructions; Fuel Pressure Inspection; Fuel Pump Inspection - Suzuki kq750 Service Manual

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 seat. Refer to "Seat Removal and
Installation in Section 9D (Page 9D-11)".
2) Remove the left side cover. Refer to "Front Side
Exterior Parts Removal and Installation in Section
9D (Page 9D-6)".
3) Place a rag under the fuel feed hose and disconnect
fuel feed hose (1) from the fuel delivery pipe.
4) Install the special tools between the fuel pump and
fuel delivery pipe.
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)
(B)
(A)

Repair Instructions

B831G21706001
1
I831G1170005-02
(C)
(D)
I831G1170007-01
5) Turn the ignition ON and check for fuel pressure.
Fuel pressure
Approx. 294 kPa (2.9 kgf/cm
If the fuel pressure is lower than the specification,
check for the followings:
• Fuel hose leakage
• Clogged fuel filter
• Pressure regulator
• Fuel pump
If the fuel pressure is higher than the specification,
check for the followings:
• Fuel pump
• Pressure regulator
6) Remove the special tools.
WARNING
!
Before removing the special tools, turn the
ignition switch OFF and release the fuel
pressure slowly.
7) Reinstall the removed parts.

Fuel Pump Inspection

Turn the ignition switch ON 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-7)" and "TO Sensor
Inspection in Section 1C (Page 1C-5)".
If the fuel pump relay, TO sensor and fuel pump circuit
connections are OK, the fuel pump may be faulty,
replace the fuel pump with a new one. Refer to "Fuel
Pump Assembly Removal and Installation (Page 1G-9)".
Fuel System: 1G-6
2 , 41 psi)
B831G21706002