I drive a 2015 mazda 3 with only 85k miles. I treat it incredibly well and follow the maintenance interval in the manual religiously. The only thing Im bad about is I would literally run the gas tank to 0 miles range every single time because I would still only be putting 10-11 gallons in to the 13.2 gallon tank to fill it up so I knew it wasn’t truly empty.

Well a few weeks ago my high pressure fuel pump failed. Ended up having it replaced by mazda because I wanted the oem part. $750 part + $750 labor, ouch. Did I cause this by running my tank so low every time or is it just a coincidence? These vehicles are known to be rather reliable so to have a repair like this at 85k sucks. I now fill up at a quarter tank but I am still curious if this is my fault or if I just got unlucky.

  • FJBsquared@alien.topBEnglish
    1·
    1 year ago

    I have been running my tanks dry for 17 years. Tanks usually have issues with those who keep the tank topped off or half way because the more fuel in the tank the more water the ethanol attracts, the more water in the tank means more rust & bad gas & you run into issues. Running it dry allows you to use ip all the ethanol & water ij the tank in smaller amounts vs allowing it to accumulate. Now if you use ethanol free gas you are good to go, but run it til the light comes on.