Suzuki 2000 Grand Vitara SQ625 Service Manual page 106

6-102 ENGINE DIAGNOSIS (G16 / J20 ENGINES)
STEP
8 With fuel pump operated and fuel return hose
blocked by pinching it, is fuel pressure
applied?
9 1) Operate fuel pump.
2) With fuel return hose blocked by pinching
it, check fuel pressure.
Is it 450 kPa (4.5 kg/cm
10 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) Check again if specified fuel pressure is
retained.
While doing so, does fuel come out return
hose?
ACTION
2
, 64.0 psi) or more?
YES
Faulty fuel pressure
regulator.
Faulty fuel pressure
regulator.
Faulty fuel pressure
regulator.
NO
Shortage of fuel or fuel
pump or its circuit defective
(Refer to Table B-1 "Fuel
Pump Circuit Inspection").
Clogged fuel filter, restricted
fuel feed hose or pipe, faulty
fuel pump or fuel leakage
from hose connection in fuel
tank.
Fuel leakage from injector,
faulty fuel pump (faulty
check valve in fuel pump)
or fuel leakage from fuel
pressure regulator
diaphragm.