Fuel Pump Relay
- ECM supplies power to relay as long as ECM receives ignition reference signals or starter crank signal. To run fuel pump without starting engine, remove relay and jumper terminals No. 2 and 4. See Figure and Figure .
- To test relay, use jumper wires to ground terminal No. 4 of relay and apply battery voltage to terminal No. 2 of relay. Using ohmmeter, check for continuity between relay terminals No. 1 and 3. If continuity is not present, replace relay.
FUEL PUMP PERFORMANCE
| Application | Unregulated Pressure psi (kg/cm2 ) | Regulated Pressure psi (kg/cm2 ) |
|---|---|---|
| Stylus | 35-38 (2.5-2.7) | 25-30 (1.7-2.1) |