Suzuki Engine 2002 GRAND VITARA SQ420 Service Manual page 284

Step
5 Is there fuel leakage from fuel feed line hose,
pipe or joint?
6 Was fuel pressure higher than specification in
Step 2?
7 Fuel Return Line check :
1) Disconnect fuel return hose from fuel pipe
and connect new hose to it.
2) Put the other end of new return hose into
approved gasoline container.
3) Operate fuel pump.
Is fuel pressure 270 – 310 kPa?
8 Fuel Pressure Regulator check :
1) With fuel pump operated and fuel return
hose blocked by pinching.
Is fuel pressure applied then?
ENGINE GENERAL INFORMATION AND DIAGNOSIS (H25 ENGINE) 6-1-143
Action Yes
Fuel leakage from fuel
feed line hose, pipe or
joint.
Go to Step 7.
Restricted fuel return
hose or pipe.
Faulty fuel pressure regu-
lator.
No
Fuel leakage from injec-
tor, fuel pressure regula-
tor or fuel pump.
Go to Step 8.
Faulty fuel pressure regu-
lator.
Clogged fuel filter,
restricted fuel feed hose
or pipe, faulty fuel pump
or fuel leakage from hose
connection in fuel tank.