Van keeps shutting off. i've done a complete tuneup with the exception of changeing the fuel filter. and now it seems to b burning gas or something. 1 minute i have gas and the next i dont

Sounds like you've replaced just about everything except the injectors and done a fuel pressure test.

it sound like your van is running rich.the use of those products are not going to improve your gas consumption.instead change air filter .clean or replace air mass sensor.check tire pressure .also a bad fuel injector will make the other ones spray more gas in order to keep engine at idle

Spark plugs, air filter, or possibly water in your fuel. When your tank is almost empty, pour in a can of Sea Foam, then fill the tank with fuel. Sea Foam will remove water and clean your fuel injection system. It can be purchased at most auto parts stores.

Do you have a fuel pump? If its bad or weak, you aren't getting enough gas to your engine. Has anyone thought of the filter in your gas tank?

It could be a weak pump. It could be pretty old if you haven't changed it recently. To be sure, have the fuel pressure checked. Filters don't usually clog up and then start flowing again; once done, they're done.

If you change plugs I would thing changing fuel filter and check air filter also. I have a 2007 with 103,000 on it. The owners manual say the original plug are good for 100,000 miles and I changed them at 99,000 just to keep from having to do it on the fly if one of them fouled out. I did pay the 80 dollars to have the fuel system treatment. I do not know now what they called it but they changed the fuel filter also.

Check bace timing and air filter element .Also ckeck fuel rail pressure

Sounds like your actually not getting enough gas, then your fouling your plugs because something isn't firing right. When your vehicle is cold it uses more gas to run smoother, then when it warms up it is leaning the fuel out and you have to keep giving it gas because it wants to die from not getting enough fuel. Whens the last time you've done a full tune up? or timing adjustment? check easy things first like air filter, plug wires....I'm sorry but I think it's going to be something a bit more difficult, atleast first start with your air filter.

I don`t know this particular car but I don`t think the dissy has anything to do with the fuel gauge. Did the fuel gauge work perfectly before?? If so, you`ll probably find that you`ve disturbed a connector which goes to the sender unit. It`s very easy to do, I`ve done it myself and it`s VERY annoying to find you`ve sorted one fault only to find that you`ve caused another fault. Just go over everything that you`ve touched and done to the car. Did you short something out when you were replacing the cap, if so, you`ll probably find that a fuse has failed and it`s not just the gauge that doesn`t work. All the best, Ian