When i few up it will not start

When filling the tank, stop filling when the pump clicks off. It sounds like you are overfilling the tank getting gas onto the built in evaporator.

Just stop filing when pump clicks off.

Unhook battery, press brakes to de-power everything. Leave unhooked for half hour or more.

Re-connect the battery. Turn key to on position. Do not start the car... just to on. Don't touch the gas pedal at all. Leave for ~10-20min.

Turn key straight to start and start the car. Do not touch the gas pedal. Let idle for ~10min without touching anything.

Turn off car. Restart, drive. It might take a few heat cycles and a bit of driving before the ECU 'learns' everything over again.

PO122 is a Throttle Position Sensor
An APPor ETC is the pedal position sensor
which is the gas pedal,all shop know that one
Remember the Toyota issues a few years back
NASA found nothing wrong with them
Don't think you have drive by wire in 1996
Your saying no one can look up a Code,odd isn't that
You can Google any codes you ever get & read for months

bring this to a service repair center an have a fuel pressure gauge hooked up to it..it sounds like the check valve in the fuel system is allowing the gas to drain back into the fuel tank, when u press the gas pedal it commands the fuel pump to pump extra gas into the system filling the fuel rails back up with fuel allowing it to start faster....

tons of reasons.... depends on your troubleshooting feedback fouled plugs (change em) crappy gas (put a pint of gas cleaner in the tank at next fillup before you fill it) low fuel pressure (breach in fuel delivery?)
I assume you are not pumping the gas pedal at all, but if you are, do not do that. Leave your foot off ! If you do pump it, it will most easily flood it with gas and prevent ignition until the gas is cleared (you can clear a flooded system by pressing and keeping the gas pedal to the floor (once) and try to crank. Release the pedal immediately upon successful ignition revolutions.

It would be good to know the make, year and model of the van to do a diagnosis. I'll take a stab in the dark, High reving could be caused by a faulty idle air control motor, common on a Ford. Is the Service Engine Soon light on? A malfuntioning Throttle position sensor will cause a high idle. I wish I had more info so I could be of help, Good luck, Gary

if you pumped more gas after the handle shut off then you caused an issue by over filling. this happens to alot of cars when you try to get every once in the tank.

you have "NO TOUCH" starting, so you should not touch the gas pedal during starting.

If you hold hte gas pedal to the floor during cranking, it shuts off the fuel supply so you can clear a flooded engine.

Try pumping the gas pedal 3 to 4 times before starting your car. If that does'nt work, check your automatic chock, it might not be opening up.

AmyLynn001, 1st thing, let the car sit for a couple hours (because u smell gas, it's definitely flooded). Turn the key to start (do NOT touch the gas pedal!! Cars are designed now to start w/out touching the gas pedal. If u do, u will flood it, and make it even more difficult to start) When u turn the key, only hold it to turn the engine over for no more than 10 seconds. If after the 10 seconds it doesn't start, turn key off, wait about 10 seconds, repeat. (this is to reduce wear and tear on the starter, and to not run the battery down real quick). It sounds like several problems coming together caused this. U state that the car needs a tune up, it's likely the overheating, need of a tune up (car not performing to optimum efficiency) and pushing on the gas pedal, resulting in flooding, all came together to create this no start condition. Eliminate any one (preferably all!) and u should be able to start the car. So, hopefully just letting it sit and not touching the gas pedal while attempting to start will be enough to get u back on the road, then get that tune up soon. Let me know how u make out.