I've heard to avoid gas stations for a few days after they've been filled because the sediments in the tank get disturbed. Can't that stuff transfer into your tank? Also, I only fill up at Shell and Chevron unless I have absolutely no choice. But, who KNOWS whats in some of the gas you can buy in little unknown stations. I think there is plenty of potential for crap to get into your tanks.
In my area, it would be totally impossible to wait a few days after a station gets a delivery since the stations get deliveries EVERY DAY.
It has been my experience that filters on gas pumps do a decent job of keeping "junk" out of a vehicle's fuel tank.
What the pump filters do not deal with very well is water in the gas.
If water gets into the vehicle fuel tank or condensates in the tank that is how "junk" can and does get into the tank.
The water/condensation along with letting the tank get low can and does RUST metal parts in the tank over time.
That RUST then becomes the "junk" in the tank that WILL CLOG in tank fuel filters and/or restrict fuel lines going to the engine.
I recently had a fuel flow problem in one of my vehicles. The fuel pump died. After replacing the pump the vehicle would not start/run.
Further investigation revealed that "junk" (ie Black Goo) in the tank had clogged the in tank fuel filter.
Turned out that the fuel sending unit's metal parts had rusted, flaked off and created the goo and problem.
I ended up swapping out the tank, in tank filter and sending unit for new/used ones and the vehicle runs fine now.
I do have to wonder if there are metal parts inside the 4Runner tank?
If so, one has to wonder if 4Runner owners who run their tanks down so low are risking future problems with "junk" in their tanks?
After dealing with the "junk" problem in my other vehicle and dropping/replacing the fuel tank, I can say that is one PITA I would not want to repeat with my 4Runner.