Residual Pressure
- Open valve on gauge. Switch fuel pump on with Jumper for 30 seconds. Then turn off and check pressure. After 10 minutes, minimum pressure should be 38 psi (2.6 kg/cm2 ). If pressure drops, check fuel pump check valve and connections for leaks.
- If no leaks show, check sensor plate clearance. After starter or jumper have run for 10 seconds, plate clearance to plunger must be between some play at minimum to .078" (2 mm) maximum.
- This testing does not cover cold start valve check, which should be tested before replacing parts. If sensor plate clearance is correct, replace diaphragm pressure regulator. If pressure doesn't hold now, replace fuel distributor "O" rings.