* Fuel Filter: A clogged fuel filter will prevent fuel from reaching the engine, even with a new pump. This is a cheap and easy part to replace, and should be done *before* you did anything else.
* Fuel Pressure Regulator: This regulator controls the fuel pressure in the fuel rail. If it's faulty, it might not maintain the necessary pressure for the engine to run after the initial squirt of starting fluid. A pressure gauge is needed to test this.
* Clogged Fuel Injectors: The injectors spray fuel into the cylinders. If they're clogged or dirty, they won't deliver enough fuel to keep the engine running. Cleaning or replacing them might be necessary.
* Fuel Rail Leaks: A leak in the fuel rail itself will prevent proper fuel delivery. Inspect the rail carefully for cracks or loose connections.
* Ignition System Issues (Though less likely): While the starting fluid suggests a fuel problem, a weak spark could also contribute. A faulty ignition coil, distributor cap, rotor, or ignition wires could prevent the engine from running consistently even with fuel.
* Computer/Sensors: The vehicle's computer controls fuel delivery based on sensor inputs. A faulty crankshaft position sensor, mass airflow sensor, or other sensor could send incorrect signals leading to poor fuel delivery. A diagnostic scan tool could help identify issues here.
Troubleshooting Steps:
1. Check Fuel Pressure: Use a fuel pressure gauge to measure the pressure at the fuel rail. This is the most crucial step. It will tell you if the pump is delivering fuel, and if the regulator is working.
2. Inspect Fuel Filter and Lines: Look for any visible damage, kinks, or blockages in the fuel lines. Replace the filter – it's inexpensive and often overlooked.
3. Check for Leaks: Inspect the fuel rail and injectors for leaks.
4. Test the Fuel Injectors: If you have the tools and knowledge, you can test the injectors to ensure they are spraying properly.
5. Consider the Ignition System: While less likely, a weak spark can prevent a consistent run. Check the coil, cap, rotor, and wires for signs of wear or damage.
6. Professional Diagnosis: If you're not comfortable performing these checks yourself, take it to a mechanic. They have the tools and experience to diagnose the problem accurately.
Remember safety first when working with fuel systems. Disconnect the battery negative terminal before starting any work. Fuel is flammable, and fumes can be explosive. Work in a well-ventilated area.
