Here we go again. I know there are many posts about this problem on here but I thought I'd try here. The van is a '96 5.2. When the tank gets below the half way point it starts to stutter and back fire and won't go over 40 mph, sometimes less. I tried changing the Oxygen Sensors, that didn't help. The thing is, the thing seems to run fine with a full tank. I'm thinking it could be the fuel filter, but you have to drop the whole tank. My friends think it's electrical butI don't know. thank you.

 

It's more likely that your pickup tube inside the tank has lifted off the bottom of the tank. Once the fuel level drops 1/2 way down it starts pumping air. Whether you want to or not, I suspect you will be dropping the tank.