Fuel delivery problem, engine shuts off due to the fuel filter is half empty

This is a tough one. You have a new fuel pump, fuel filter, and the feed, and return fuel lines are not clogged. My next question to you is, will the same problem happen if the fuel tank is full? If not, its possible your pickup tube in the tank may be the problem. Other than that, it would have to be the mechanical pump. If it's a cheap one, it's likely the diaphragm inside has failed. Why it happens at certain times, and not others though, I cannot answer. This is a very basic fuel system, so we need to be very basic with diagnosis. I hope this helps. Keep us posted.

Good evening,

There are rubber hoses that connect to the mechanical fuel pump on the block and back at the fuel tank.

If those hoses have cracks around them, they will draw air into the lines and the mechanical pump will not be able to draw fuel from the tank.

I would replace all the rubber hoses on the system and then see if it happens again. That would include the switching valve as well.

Roy