Good Lord, you have had your hands full. I'm just surprised they didn't take the time to locate the issue and repair it. One would think between three mechanics, one of them would have fixed it.
Okay, we have a new fuel pump. The issue could be that the pump still isn't performing to what is needed or we have a problem with the fuel injectors.
I realize you aren't comfortable performing tests, but we need to make sure the fuel pressure is good.
Here is a link showing you how it's done:
If that checks to be within the manufacturer's specifications, then we need to move to the fuel injectors to see if they are getting power. Also, they need a ground path to complete the circuit when fuel is needed for each cylinder.
Take a look at this link:
Keep in mind, I am basing this on the idea that the vehicle nearly started when using starting fluid. That tells me there is ignition spark to the spark plugs. It also tells me the engine isn't getting fuel without the starting fluid.
I hope this makes sense. Let me know if this helps you better understand or if you have questions.
Let me know.
Monday, April 10th, 2023 AT 8:33 PM