Fuel Pump Relay
- Relieve fuel system pressure. See FUEL SYSTEM PRESSURE RELEASE
. Attach Fuel Pressure Gauge Set (J-34730-1
) and Adapter (J-35957-1
) to outlet side of fuel filter. Disconnect pressure regulator vacuum hose. Turn ignition on. Allow fuel pump to run for about 2 seconds.
- Fuel system pressure should be about 41-46 psi (2.8-3.2 kg/cm2
). Start engine and check for leaks. Connect pressure regulator vacuum hose. If engine will not start, fuel pump relay can be by-passed. Also see CHART A-3, ENGINE CRANKS BUT WILL NOT RUN
under TROUBLE SHOOTING CHARTS. With engine idling, fuel pressure should be 25-30 psi (1.8-2.1 kg/cm2
).
- 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
.
- 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
) |
| Rodeo 3.2L |
41-46 (2.8-3.2) |
25-35 (1.7-2.4) |