Fuel Pump Relay

WARNING: This page is about a different car, the 1995 Isuzu Trooper. However, it is still accessible from the selected car via links, so may be relevant.

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/Model

Unregulated Pressure psi (kg/cm² )

Regulated Pressure psi (kg/cm² )

Trooper

⁽¹⁾ 41-46 (2.8-3.2)

⁽²⁾ 25-30 (1.8-2.1)

⁽¹⁾	With ignition on and vacuum hose disconnected from pressure regulator.

⁽²⁾	With engine at idle or with 12-14 in. Hg vacuum manually applied to pressure regulator.