1. Check the fuel lines: Make sure that the fuel lines are properly connected and that there are no leaks.
2. Check the fuel filter: A clogged fuel filter can prevent fuel from reaching the engine. Remove the fuel filter and check it for dirt or debris. If the fuel filter is clogged, replace it with a new one.
3. Check the fuel pressure: Use a fuel pressure gauge to check the fuel pressure at the fuel rail. The fuel pressure should be within the manufacturer's specifications. If the fuel pressure is too low, there may be a problem with the fuel pump or the fuel pressure regulator.
4. Check the ignition system: Make sure that the spark plugs are properly gapped and that the spark plug wires are in good condition. Check for any loose or broken connections in the ignition system.
5. Check the air intake: Make sure that the air intake is clear and free of obstructions. A clogged air intake can prevent the engine from getting enough air to run properly.
6. Check the exhaust system: Make sure that the exhaust system is clear and free of obstructions. A clogged exhaust system can cause the engine to run rich and stall.
7. Check the computer: If the van has a computer, check for any trouble codes. Trouble codes can indicate a problem with the engine or its sensors.
8. Reset the computer: If the van has a computer, try resetting it. This can be done by disconnecting the battery for a few minutes and then reconnecting it.
9. Have the van towed to a mechanic: If you are unable to get the van running, have it towed to a mechanic for further diagnosis and repair.