No
No. A properly functioning engine and fuel pump do not 'care' how much fuel is available, only that there is fuel available.
A gas is expandable without limit.
Fill Spout. When filling your tank with gas, you will need to open your gas tank, unscrew and remove your gas cap, remove the nozzle from the pump and put it in the fill spout.
Yes, a gas will always fill the container that it is in.
Because gas molecules easily diffuse and fill completely a closed vessel.
Just write down the mileage when you fill up your car and drive until you need gas again. Note the mileage at that fill-up, subtract from the previous mileage and divide by the gallons of gas to fill up.
because your car has a gas leak
A gas will completely fill whatever container it's in as it will diffuse until it's concentration is the same throughout the container.
It will completely fill the container.
In your owner's manual, check capacity of your car's tank. Fill it up completely full. Every time you need to refill your tank that week, record how many gallons you added. At the end of your week, fill your tank once more and add all the gallons you fueled together.
You have a vapor lock, perhaps caused by the car's evaporative system. Often just pulling out the pump nozzle and putting it in at a different angle, half way in, or slowing the flow will do the trick. Avoid topping off when you fill up your tank.
It may be vapor locking or flooding. It main need some timing work.