1999 Dodge Ram

Has the check engine light come on? Have you checked fuel pump pressure?

Hi:
Here is a how to for checking fuel pressure. It contains a video and also discusses checking the fuel pressure regulator which is easy to do.

https://www.2carpros.com/how_to/how_to_check_fuel_pressure.htm

As far as the security system, are you getting spark to the engine? Is it a factory alarm? Finally, is there a secruity light staying on?

NOTE: You will need a fuel pressure gauge. Most parts stores will lend or rent them to you. Let me know what you find.

Joe

If I had to guess, I would say you have a bad crank sensor. It should have set an engine light, but it doesn't always happen. When they checked it, it may have been working properly. Thus, they found no problem.

I hate to say it, but this is one of those problems that is either a guessing game, or the vehicle is used until the problem gets bad enough to find. However, based on your discription, it could be a hazard if the engine dies while driving.

You may want to try replacing the crank sensor to see if that fixes the problem, but I am going from experience only. There is nothing indicating that is 100% the problem.

The crank sensor is near the harmonic balancer (bottom front of the engine). Make sure that hasn't already been replcaed. As far as the fuel system, it could be a weak fuel pump, regulator. Have you checked it? I believe I gave the directions in a prior posting.

I reviewed the entire post. Has the vehicle started since it died? If not, have you checked to see if you have spark and fuel to the engine?

It is hard to say without a check engine light. However, a crank sensor usually plays a role in this type of situation. What you need to do is check for spark and fuel to the engine when this happens and it doesn't restart right away. One will be missing. Once we know which one is missing, then we know what system to attack, ignition or fuel. Do you know how to check for both items?