Leak And Flow Rate Test
- Check for correct system (line) pressure, bleed pressure gauge, then move lever to OPEN position. Gauge should read 49-54 psi (3.4-3.8 kg/cm2 ). Turn engine "OFF"; pressure should drop to a maximum of 37 psi (2.6 kg/cm2 ).
- If pressure is too high, readjust system pressure and retest. Pressure should hold at a minimum of 26 psi (1.8 kg/cm2 ) after 10 minutes, and 23 psi (1.6 kg/cm2 ) after 20 minutes.
- If pressure drops too much, restart and warm-up engine. Turn engine off, pinch off hose between fuel tank and pump, and recheck pressure drop. If pressure is now okay, pump check valve is leaking. If not, check relief valve in mixture control unit, or leaking injectors or cold start valve.
- Test fuel pump flow rate by removing return line at fuel distributor and placing open end in container. With pump running for exactly 30 seconds, flow should measure 24 02. (750 cc) on pump with push-on terminals, or 30 oz. (900 cc) on pump with bolt-on terminals.