I have heard it is not good to fill up your tank when a tanker is there unloading? Maybe stirs up sediment in the underground tank?
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I don’t for that reason. Is it a legit reason, don’t know, I figure better safe than sorry.
It’s hard to time gas stops by the Costco locations to coincide with the absence of tankers. It seems they are there 30-40% of the time I stop by for gas. I’ve never had a problem with contaminants from Costco.
What is the source of contaminants?
Granted it would be from rusting steel tanks but most/all of those tanks have been replaced.
Probably no longer a problem.
Water? Sand? Gasoline rises above water under quiet conditions, but if it’s being mixed by a turbulent inflow of new gasoline, it could be temporarily mixed together like salad dressing oil and vinegar .
Each pump has a filter and I believe for each type of fuel.
When I worked at a station we also had to stick the tanks to look for water/condensation. A long wooden stick was inserted into each tank and the stick had a chemical to see if there was water in the bottom.
This used to be the case many years ago. Storage tanks were metal and buried in the ground.
They were subject to rust and leakage and dirt could get into the tanks. There was a period of time when gas stations would shut down because they did not have updated tanks. The stations would either go out of business or replace the tanks.
Today, storage tanks are either made of fiberglass or they have a fiberglass outer shell. to prevent dirt and ground water infiltration. Modern pumps have filters to screen anything that might make it out of the storage tank and to the nozzle.
It is a good idea to fill up at a station that dispenses a lot of gas. This way you will get “fresh gas” and this will minimize the chance that you will get gas that was exposed to condensation in the storage tanks. All of the wholesale clubs get gas deliveries multiple times during the day because they dispense a lot of gas.