* Fuel Pump Itself: The most probable culprit at this point is the fuel pump itself. Even if the relay and filter are new, a faulty pump won't deliver fuel. You might need to drop the tank to access and replace it. This is often a significant job.
* Wiring: Check all wiring related to the fuel pump. Look for broken wires, corrosion, or loose connections at the pump, the relay, and the fuel pump inertia switch (often found under the dash or in the engine bay). A multimeter can help check for continuity and voltage.
* Fuel Pump Inertia Switch: This safety device cuts power to the fuel pump in the event of a collision. If it's tripped, it needs to be reset (usually a small button on the switch).
* Clogged Fuel Line: While less likely after replacing the filter and strainer, a clog could exist *before* the strainer, possibly in the fuel tank itself. This would require a thorough inspection of the fuel lines.
* Fuel Pressure Regulator: This component regulates fuel pressure in the fuel rail. A faulty regulator can prevent sufficient fuel from reaching the injectors. This requires a fuel pressure test to diagnose.
* Computer/ECM Issue: Although less common, a faulty Engine Control Module (ECM) can prevent the fuel pump from activating. This requires diagnostic tools to check for error codes.
Troubleshooting Steps:
1. Check the Fuel Pump Inertia Switch: Locate and reset it.
2. Listen for the Fuel Pump: Have someone turn the ignition key to the "ON" position (don't crank the engine). You should hear a brief humming sound from the fuel tank area. If you don't hear it, the pump might be faulty or not receiving power.
3. Check Fuel Pressure (Most Important): This requires a fuel pressure gauge and a connection to the fuel rail. This test will tell you if the pump is delivering the correct pressure. This is crucial for determining if the pump is the problem or something else. A low or no pressure reading points directly to the pump or regulator.
4. Visual Inspection of Wiring: Carefully examine all wiring connected to the fuel pump, relay, and inertia switch. Look for any damage or loose connections.
Before you do anything:
* Safety First: Disconnect the negative battery terminal before working on the fuel system. Gasoline is highly flammable.
* Professional Help: If you are not comfortable working on your car's fuel system, take it to a qualified mechanic. Working on the fuel system incorrectly can be dangerous.
The lack of humming suggests a problem with either the pump itself or the power supply to the pump. A fuel pressure test is the most definitive way to diagnose this issue.
