* Does it crank but not start? This could indicate a lack of fuel pressure, even with a new pump.
* Does it start but sputter or hesitate? This might suggest a clogged fuel injector, weak spark, or other issues.
* Does it run poorly under load? This could point to a weak fuel pump (even a new one might be faulty), clogged fuel lines, or other problems.
* Is there a fuel leak? A leak anywhere in the system will prevent proper fuel delivery.
* Is the check engine light on? If so, what is the code? This will give crucial information about the problem.
Once you provide more detail about the symptoms, I can offer more specific troubleshooting steps. Some possibilities, regardless of your specific symptom, include:
* Faulty fuel pump: While unlikely, it's possible you received a defective new pump.
* Clogged fuel lines: The lines might have debris that wasn't cleared when you replaced the pump and filter.
* Fuel pressure regulator: This component regulates fuel pressure; a faulty one can cause various problems.
* Fuel injectors: Clogged or faulty injectors can prevent proper fuel delivery to the engine.
* Ignition system problems: A weak spark or other ignition problems can mimic fuel delivery issues.
* Wiring issues: Damaged wiring related to the fuel pump or injectors can disrupt the system.
* Computer issues: The vehicle's computer could be malfunctioning and not providing the correct signals.
Providing details about the symptoms will allow for a more accurate diagnosis.
