Engines stall shortly after starting

Good question. Many things to eliminate. You might want to have a mechanic narrow this down with a diagnosis. Otherwise, here are possible causes:

Fuel pressure regulator: If the fuel pressure regulator is faulty, it can cause the engine to start and then stall immediately. You may want to check the fuel pressure regulator to see if it's working properly.

Fuel pump relay: A faulty fuel pump relay can cause the engine to start and then stall immediately. You may want to check the fuel pump relay to see if it's working properly.

Crankshaft position sensor: If the crankshaft position sensor is faulty, it can cause the engine to start and then stall immediately. You may want to check the crankshaft position sensor to see if it's working properly.

Ignition switch: A faulty ignition switch can cause the engine to start and then stall immediately. You may want to check the ignition switch to see if it's working properly.

Battery: If the battery is weak or dead, it can cause the engine to start and then stall immediately. You may want to check the battery to see if it's working properly.

Fuel filter: A clogged fuel filter can cause the engine to start and then stall immediately. You mentioned that you already changed the fuel filter, but it's possible that there's still an issue with it.

Vacuum leak: A vacuum leak can cause the engine to start and then stall immediately. You may want to check for any vacuum leaks in your truck.

If your 2004 Hyundai XG350 starts but does not stay running, there could be several reasons for this issue. Here are a few possible causes:

1. Fuel delivery issue: If your car is not receiving enough fuel, it may start briefly but then stall. This could be due to a clogged fuel filter, a failing fuel pump, or a fuel pressure regulator that is not functioning correctly.
2. Ignition system problem: If there is an issue with the ignition system, it can cause the car to stall shortly after starting. This could be due to a faulty ignition coil, spark plugs, or ignition control module.
3. Air intake problem: If there is a blockage in the air intake system, it can cause the engine to stall. This could be due to a clogged air filter or a problem with the mass airflow sensor.
4. Engine management issue: If there is a problem with the engine management system, it can cause the car to stall. This could be due to a faulty sensor or a problem with the engine control module.

This stalling is fuel related issue.When the fuel flow becomes low, the engine ask for fuel.But fuel pump does not send required fuel and engine stalls.In some cases, it stall then dies after stalling for few minutes.In some cases, if stalls for few seconds or minutes, then again get required fuel , as you accelerate more and engine starts/runs normally.But once this problem is started and it repeats again n again.This is indication f low fuel pressure.Get the fuel pressure checked and replace fuel pump and fuel filter.-----------

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This will help.Thanks.Helpmech.

signs of a bad fuel pressure regulator. the vehicle runs rough, the engine will not start usually in the mornings. many times engine starts but stalls shortly after starting. a bad regulator can result in fouled plugs. black soot on plugs, blake smoke from tailpipe, running rough, stalling. you could have residue in fuel tank and need to change fuel filter again. have a very good day !!

sounds like you have a bad fuel pump.Or possibly a clogged fuel filter.

that would be a wet soak concern, Likely fuel pump failure

You have a lot to check. Start by scanning the engine codes. There's good chance it will tell you where to look next.
The symptoms sound like fuel delivery (assuming the engine runs well when it runs). Put a fuel pressure gage on the car and verify that you are getting a constant and good pressure. Could be fuel pump, blocked lines, bad fuel regulator, or an intermittent electrical problem. I had a situation like this where the car would run fine and then just cutout or not start. Turned out to be a loose connection to the fuel pump. Easy fix. Very hard to find.

first thing I'd do is change the fuel filter.

It is part of the fuel pump module inside the fuel tank, all the cars are starting to use this type of setup, the filter is only serviced when the fuel pump fails.

try some STP gas treatment that contains a lubricant for the fuel pump and also have the fuel filter replaced