Lower Chamber (Differential) Pressure - Part I
- Close valve on pressure gauge. Activate fuel pump with jumper switch. Leave differential pressure regulator disconnected. Differential pressure reading should be 2.9-7.0 psi (.2-.5 kg/cm2 ) less than system pressure. If pressure is not correct, disconnect lower chamber return line and hold open end over measuring container.
- Close open port to diaphragm pressure regulator. Activate fuel pump with jumper switch. Fuel volume should be .14-.16 qts. (.13-.15L) for period of 1 minute. If volume is correct, replace differential pressure regulator. If volume is not correct, replace fuel distributor.