Ford 3S4Z-9H307-BC Sender And Pump Assembly

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To check the fuel pump, turn on the ignition and listen for the motor running beneath the rear seats. If it runs continuously, there's a fault in the control system. On 2.0L Zetec-E models, listen for fuel return noises and feel for fuel pulsing. If the pump doesn't run, check the fuse, relay, wiring, and cut-off switch. To check fuel pressure, connect a gauge in the fuel line, run the pump for two seconds, and note the reading. If the pressure is too high or low, check the regulator, filter, lines, or pump. Start the engine and ensure the pressure stays within range. If it's too low, check the same components. If no issues are found, replace the regulator and pump. For 2.0L Zetec-E engines, pinch off the return line and check for restrictions. Reconnect the vacuum hose to the regulator and ensure the pressure decreases. After testing, ensure the pressure holds steady. If it drops, there may be issues with the pump, regulator, or an injector. Finally, relieve the pressure and remove the gauge.

The pump/sender unit should be turned counterclockwise inside the tank to secure it in place. The pump/sender top cover should be aligned with the arrows on the tank and unit before installation. Additionally, ensure that the unit is firmly located before proceeding with the installation.