Suzuki Swift User Manual page 152

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 throttle body and
connect new return hose to it.
2) Insert the other end of new return hose into
approved gasoline container.
3) Check again if specified pressure is retained.
While doing so, does fuel come out of return hose?
Fig. 1 for Step 1
1. Fuel pressure gauge & 3way joint
ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10) 6-101
ACTION
2
, 63.9 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 B-2
FUEL PUMP ANDITS
CIRCUIT CHECK).
D Clogged fuel filter,
D Restricted fuel feed
hose or pipe,
D Faulty fuel pump or
D Fuel leakage from
hose connection in
fuel tank.
D Fuel leakage from
injector,
D Fuel leakage from
between injector
and throttle body,
D Faulty fuel pump
(faulty check valve
in fuel pump) or
D Fuel leakage from
fuel pressure
regulator
diaphragm.