How long to wait to buy gas after a filling station refills their underground tanks
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    1. #1
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      How long to wait to buy gas after a filling station refills their underground tanks

      It used to be "common knowledge" that you shouldn't buy gasoline right after a station refilled their underground tanks. The common thinking was that the filling process would stir up water and suspended contaminants in the underground tank. Then, after a period of time, the contaminants would settle to the bottom of the storage tank and the pump would again deliver clean gasoline.

      I think of this often when I drive to Costco to buy gasoline, only to discover that a tanker truck is at work, filling the underground storage tanks. Costco sells A LOT of gasoline, so they frequently need replenishment. And I always leave without buying.

      It's clear that present-day engines with FI are equipped with extremely efficient fuel filters. And, honestly, I don't think I've recently heard anyone saying that their vehicle was harmed by dirty fuel.

      So, is there any truth today to the "old wive's tale" or not?

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    3. #2
      Member TooFitToQuit's Avatar
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      Almost definitely an old wives tale
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    4. #3
      Member Toaster29's Avatar
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      The pump has a filter as does your vehicle
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    5. #4
      Member Phillie Phanatic's Avatar
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      If in doubt, I take a little sip from the pump and swish it around in my mouth to verify purity before filling up.

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    6. #5
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      A true TCLer only buys gas on Friday.
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    7. #6
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      Quote Originally Posted by scribe42 View Post
      It used to be "common knowledge" that you shouldn't buy gasoline right after a station refilled their underground tanks. The common thinking was that the filling process would stir up water and suspended contaminants in the underground tank. Then, after a period of time, the contaminants would settle to the bottom of the storage tank and the pump would again deliver clean gasoline.

      I think of this often when I drive to Costco to buy gasoline, only to discover that a tanker truck is at work, filling the underground storage tanks. Costco sells A LOT of gasoline, so they frequently need replenishment. And I always leave without buying.

      It's clear that present-day engines with FI are equipped with extremely efficient fuel filters. And, honestly, I don't think I've recently heard anyone saying that their vehicle was harmed by dirty fuel.

      So, is there any truth today to the "old wive's tale" or not?
      bolded to answer your question

    8. #7
      Member lcubed's Avatar
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      you should get gas directly from the tanker and bypass the underground tank issue

    9. #8
      Member adrew's Avatar
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      I don't care about this, but if I end up at a station and it is pumping extremely slowly (like 1 gallon/minute) I will buy a couple bucks' worth and then go to the next one down the road.
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    10. #9
      Member GLI Dan's Avatar
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      Quote Originally Posted by lcubed View Post
      you should get gas directly from the tanker and bypass the underground tank issue
      I actually fill up at the port direct from the ships.
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    11. #10
      Member n0rdicalex.'s Avatar
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      I don't like to fill up when the truck is there filling the tanks, but that's more of an internal paranoia than anything. plus I usually fill up when my vehicles get to a quarter tank, so it's never critical.
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    12. #11
      Geriatric Member BRealistic's Avatar
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      At least 6 weeks.
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    13. #12
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      I usually look to fill up when I've got just over 1/4 tank of gas; if I see a tanker at my preferred gas station, I leave it for the day after.
      I don't know how true it is or not, but I've heard somewhere that letting your gas tank too low can overexert your LPFP.
      I don't mind having to fill up a little more often than the average driver.

    14. #13
      Senior Member UncleJB's Avatar
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      Quote Originally Posted by adrew View Post
      I don't care about this, but if I end up at a station and it is pumping extremely slowly (like 1 gallon/minute) I will buy a couple bucks' worth and then go to the next one down the road.
      This - so annoying.

      Quote Originally Posted by n0rdicalex. View Post
      I don't like to fill up when the truck is there filling the tanks, but that's more of an internal paranoia than anything. plus I usually fill up when my vehicles get to a quarter tank, so it's never critical.
      And this. As a rule of thumb I try not to be in the general area when large volumes of flammable liquid are being transferred.

    15. #14
      Geriatric Member spockcat's Avatar
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      How long to wait to buy gas after a filling station refills their underground tanks

      Quote Originally Posted by GLI Dan View Post
      I actually fill up at the port direct from the ships.
      I drive to West Texas every week to get my own West Texas crude for my basement refinery.

      I used to have my own dinosaur but he died and isn’t ready for oil yet.
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    16. #15
      Member TooFitToQuit's Avatar
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      Quote Originally Posted by adrew View Post
      I don't care about this, but if I end up at a station and it is pumping extremely slowly (like 1 gallon/minute) I will buy a couple bucks' worth and then go to the next one down the road.
      From two summers on a fuel dock: the issue is pretty much always the user. Release the handle, wait 30 seconds, and try again. It'll speed up.
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    17. #16
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    18. #17
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      Quote Originally Posted by Toaster29 View Post
      The pump has a filter as does your vehicle
      In addition to this, the filter will swell when in contact with water which will prevent it from getting in your car.
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    19. #18
      Member Pushrods's Avatar
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      Quote Originally Posted by lcubed View Post
      you should get gas directly from the tanker and bypass the underground tank issue

      This. Some friends and I go out every couple months or so and acquire a tanker.


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    20. #19
      Member Dal97GLX's Avatar
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      You will never get gas then. Stations get deliveries everyday, my work delivers gas to stations.

    21. #20
      Senior Member chucchinchilla's Avatar
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      Quote Originally Posted by Toaster29 View Post
      The pump has a filter as does your vehicle
      Granted I've never given gas pumps much if any thought, I never knew they had fuel filters in there. Makes sense. Found a pic..

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    22. #21
      Just Going with the FLO. Strange Mud's Avatar
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      my Dad had taught me this about waiting.....I asked a tanker guy and believed him when he said just buy gas and don't worry about it.
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    23. #22
      Member someguy123's Avatar
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      Not much to worry about at Costco since they refill the tanks frequently and many members are pumping the mixed crap into their cars. Probably the cleanest tanks of all gas stations.

    24. #23
      Member whiteboy1's Avatar
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      Quote Originally Posted by spockcat View Post
      I drive to West Texas every week to get my own West Texas crude for my basement refinery.

      I used to have my own dinosaur but he died and isn’t ready for oil yet.

      Bravo.
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    25. #24
      Senior Member Silly_me's Avatar
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      Quote Originally Posted by chucchinchilla View Post
      Granted I've never given gas pumps much if any thought, I never knew they had fuel filters in there. Makes sense. Found a pic..
      +1

      To piggyback on this, since the consensus is it doesn't matter, does the old rule get fuel from the newest station with the newest tanks meet with the same response?
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    26. #25
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      Quote Originally Posted by lcubed View Post
      you should get gas directly from the tanker and bypass the underground tank issue
      ^this, but only after the tanker has been stationary several days to allow sediment to fall to the bottom

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