Suzuki 2000 Grand Vitara SQ625 Service Manual page 237

6-1-126 ENGINE (H25 ENGINE)
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?
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
regulator.
NO
Fuel leakage from
injector, fuel pressure
regulator or fuel
pump.
Go to Step 8.
Faulty fuel pressure
regulator.
Clogged fuel filter,
restricted fuel feed
hose or pipe, faulty
fuel pump or fuel
leakage from hose
connection in fuel
tank.