DR-21A Fuel Supply & Return System

1. Connect a suitable pressure gauge and adapter in fuel supply hose at throttle body.
2. Start engine and note fuel pressure reading.
3. If fuel pressure is 13.5---15.5 psi, proceed to Test 22. DR-22A Oxygen Sensor Operation
4. If fuel pressure is below 13.5 psi, note reading and proceed to step B. DR-21B Checking For Low Fuel Pressure
5. If fuel pressure is above 15.5 psi, proceed to step D. DR-21D Checking For High Fuel Pressure