Possible Causes:
* Faulty Fuel Pump Installation: Even if the new fuel pumps themselves are good, improper installation could lead to problems. This could involve:
* Incorrect connections: Electrical wiring needs to be secure and connected correctly.
* Loose or damaged lines: Fuel lines should be properly secured and free of leaks.
* Incorrect pump placement: Some fuel pumps have specific installation requirements.
* Clogged Fuel Filter: Even a new fuel pump can't deliver fuel efficiently if the filter is clogged. This restricts fuel flow and can cause engine stalling.
* Fuel Pressure Regulator Issue: This component regulates the pressure of fuel delivered to the engine. A faulty regulator can lead to low fuel pressure, causing stalling.
* Faulty Fuel Injectors: If the injectors are clogged or malfunctioning, they may not be delivering enough fuel to the engine.
* Electrical Problems: A short circuit, faulty wiring harness, or a problem with the engine control module (ECM) can disrupt fuel delivery or ignition systems.
* Air in the Fuel Lines: If air gets into the fuel lines, it can disrupt the flow of fuel and cause stalling.
* Other Engine Problems: Issues with spark plugs, ignition coils, or other engine components can also cause stalling.
Troubleshooting Steps:
1. Return to the garage: If the work was recently done, the garage should stand behind their repairs. They may have missed something or made an error during the installation.
2. Check for Diagnostic Trouble Codes (DTCs): Use a code reader to see if the vehicle's computer has stored any error codes that might point to the issue.
3. Inspect Fuel Pressure: A mechanic can use a fuel pressure gauge to test the pressure of fuel being delivered to the engine. This will help identify if there's a problem with the fuel pump or fuel pressure regulator.
4. Check Fuel Filter: Inspect the fuel filter for signs of blockage.
5. Verify Electrical Connections: Carefully check all electrical connections related to the fuel pump, including wiring harnesses and connectors.
6. Inspect Fuel Lines: Look for any leaks or signs of damage to the fuel lines.
7. Consider a Fuel System Cleaning: If the problem is due to clogged injectors or a build-up of deposits, a fuel system cleaning might be necessary.
Important Notes:
* Safety First: Working with fuel systems can be dangerous. If you're not comfortable working on it yourself, take it to a qualified mechanic.
* Complete Diagnosis: A thorough diagnosis is essential to pinpoint the exact cause of the stalling issue.
* Don't Guess: Avoid replacing parts without a proper diagnosis. This can waste time and money, and may not solve the problem.
I hope this helps! Good luck in getting your Chevy Express van running smoothly again.
