The new 'canister' is there because the pumps ARE that sensitive. It keeps fuel at the pump pickup when you are driving around with 1/2 gallon of fuel in your car. That fuel goes to one side of tank and then the other as you turn corners, everywhere except where it needs to be. The manufacturers were forced to protect you from yourself...........it also lowers lawsuits and warranty costs for them.
You should look at all owner's manuals now, they pretty much all STRONGLY suggest you should NOT run around with a very low fuel level or run the car out of gas.
Note how the addition of thirty dollars worth of plastic moldings and canister made the pump go up to as much as $400+ dollars. No justification for that except that they are now charging EVERYONE for the added cost of pumps failed by people who cannot read or do not care. A big majority of the warranty failed pumps were damaged by running them dry, also the major reason why you get no warranty unless you can prove you bought all the filters needed. Another portion came back and later found to be 100% functional, the result of most likely person doing the install not being able to figure out it won't prime with only a cup of fuel in it. You'd be amazed how many people do that and simply insist the pump is 'bad'. I always use a minimum of five gallons in tank when a pump goes in.