Fuel Pressure: Testing and Inspection
MEASUREMENT OF FUEL PRESSUREWARNING: Before removing fuel pressure gauge, release fuel pressure.
NOTE: If out of specification, check or replace pressure regulator and pressure regulator vacuum hose.
1) Release fuel pressure.
2) Remove fuel filler cap.
3) Disconnect fuel delivery hoses from fuel filter, and connect fuel pressure gauge.
4) Connect connector to fuel pump relay.
5) Start the engine.
6) Measure fuel pressure while disconnecting pressure regulator vacuum hose from collector chamber.
Fuel pressure: 284-314 kPa (2.9-3.2 kg/cm2, 41 - 46 psi)
7) After connecting pressure regulator vacuum hose, measure fuel pressure.
Fuel pressure: 206-235 kPa (2.1 - 2.4 kg/cm2, 30 - 34 psi)
8) Fuel pressure to high: Faulty pressure regulator and/or clogged fuel return line hose.
9) Fuel pressure to low: Faulty pressure regulator, improper fuel pump discharge or clogged fuel supply line.