Pressure Testing

Disconnect negative battery terminal. Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE . Remove the fuel pulsation damper (except Civic & Prelude). On Civic remove 12-mm banjo bolt. On Prelude, remove the sealing nut on fuel rail. Connect Fuel Pressure Gauge (07406-0040001 ). Reconnect negative battery terminal. Disconnect vacuum hose from fuel pressure regulator and pinch return line closed. Start engine, and read fuel pressure. If engine will not start, turn ignition on, wait for 2 seconds, turn ignition off, then on again and read fuel pressure.
With engine idling, reconnect vacuum hose to fuel pressure regulator and release fuel return line. Note fuel pressure. Both gauge readings should be within specification. See REGULATED FUEL PRESSURE . If fuel pressure is higher than specified, check for pinched or clogged fuel return hose or defective fuel pressure regulator. If fuel pressure is lower than specified, check for clogged fuel filter, defective fuel pressure regulator or fuel line leakage.
Relieve fuel pressure and remove gauge. Reinstall fuel pulsation damper using NEW copper washers (except Civic & Prelude) and tighten to 16 ft. lbs. (22 N.m.). On Civic, tighten 12-mm banjo bolt to 25 ft. lbs. (33 N.m). On Prelude, tighten 12-mm sealing nut to 16 ft. lbs. (22 N.m). Start engine and check for leaks.

REGULATED FUEL PRESSURE AT IDLE