FUEL GETS BACK TO TANK OVERNIGHT

Pumping the gas pedal on a fuel injected car doesn't really do anything.
However, cranking the engine for an extended period of time could "pump up" the fuel pressure.
You should have about 35psi in the fuel line when you first crank the engine. If the pressure is low, it could take 30-60 seconds to build up that pressure to get the engine to start. Min pressure is around 35-40psi. The pump in the tank could be leaking pressure back into the tank overnight, or the pump relay could be faulty.

more like fuel pump damaged. gasoline keeps fuel pump cool and lubricated if fuel tank run empty fuel pump will over heat which will destroy it. never run out of gas.fuel filter will get plugged with debris from fuel tank when tank runs empty all sediment botton tank will break up stop up fuel filter.

the reason is probably when it was run to empty, you may have picked up the crude from bottom of tank. check fuel filter, that may be the cause a plugged fuel filter!!

SOUND LIKE A INTAKE MANIFOLD LEAK.WHICH WILL CAUSE BACK FIRING.FUEL INJECTORS COULD BE STUCK OPEN DUE TO CARBON BUILT UP ON INSIDE OF THE TIPS.TRYING CLEANING INJECTORS ADDING A BOTTLE OF FUEL INJECTOR CLEANER IN A FULL GAS TANK.ONCE YOU GET ENGINE STARTED DRIVE TRUCK AROUND TO LET THE INJECTOR CLEANER CLEAN INJECTORS.IF THIS DONT WORK.YOU COULD HAVE A BAD INJECTOR STAYING OPEN.HAVE TO BE REPLACED.

I suspect the gas tank has some crud on the bottom that gets sucked in when level is very low and/or truck is parked on an incline.Suggest installing in-line fuel filter, let gas level get nearly empty and then check in-line filter. If there's junk in the filter, tank needs to be cleaned. Or just keep the tank a quarter full until it can be cleaned.

fuel pump is obviouslynot working !
check it & its wiring!!!!!

fuel pump and float

Your last sentence has me wondering, did u purchase gas for both vehicles at the same gas station? How far apart did u fill them up (same day, 2 days apart...) I am wondering if you got some bad gasoline. It would explain your problems and the coincidence of both vehicles giving u this type of problem. How about draining the gas out of the vehicle w/ the least in the tank, replace the fuel filter again add fresh gas from a different station. This is of course assuming your fuel pump is ok. When the gas is removed do u see any sediment? Any water would be at the bottom of the tank (gas floats on water) so u should check for water also. Let me know what u discover. good luck!! countrycurt0

also check fuel filter some times when you run the tank to empty sediment from the bottom tends to clog the filter

Do not top off tank when fueling. Had this problem and realized that it occured when I topped up after the pump shut off. No problem since. Feel that when topping up, you overfill the tank and fuel gets in the vent line and charcoal filter which somehow affects the fuel gauge. I have a 99 Z3 coupe.