DR-21B Checking For Low Fuel Pressure

Complete Driveability Test 21, Step A before proceeding.

This test must be performed with engine warm.

1. Turn ignition switch Off, then install pressure gauge before fuel filter using adapter C-4799.
2. Turn ignition switch to Run position and press ATM button.
3. If fuel pressure is 5 psi. higher than recorded previously, replace fuel filter.
4. If fuel pressure still below 53 psi., proceed to Test 21 step C.