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.
The high pressure fuel pump on your vehicle is cam driven based on my research. I do not believe low fuel in the tank is related. That type of pump had high failure rates on several Volkswagen models. The solution was to inspect the pump every 40,000 miles and replace the cam follower.