audtatious wrote:I would contact Infiniti customer service and complain. There is a problem and it should be fixed....all of them. If you have a different Infiniti dealership somewhere near then I would go there.
Now, he does have a good point about filling up the tank earlier. The in-take fuel pumps use the gas itself to cool them. If you continually run the tank low the lifespan of the pump will be less. Granted, that mark is usually at 1/4 tank...which in yours is even less.
My usual pattern has been to fill up at around the 1/4 mark or a little before, and the amount it took to fill meant that usually there was about 4-6 gallons left. So I hope that was enough.
TLDR version: Internal failure of fuel pump housing and faulty fuel sender unit. Replaced. Problem solved.
Side note: I happened to mention this to a Nissan service manager I know (before the repairs). He immediately said it was a bad sender, and that Nissan had recalls on some models for it.
Long version: I called the dealer again. They moved the problem up the chain (in Infiniti) and arranged to have some of the likely culprit parts on hand before they did anything, since they weren’t sure what was causing this. They’d get into the tank, take things apart and see what they’d find.
In the meantime, I shot a bunch more photos of my dashboard over the course of one tank of gas. Before, I had only shot photos of the gauge at fill-up (and the gallons needed to fill when the gauge was 1/2, 1/4, or whatever). This time, I shot photos during one tank of gas, showing it go down to 3/4, then back up above 3/4, down to 1/2, back up toward 3/4 (all showing the odometer readings), etc. etc. When I brought these in with my car the next time, they impressed one of the service managers more than my earlier photos had.
When they had the parts, I brought the car in with the gauge around 1/4, and showing about 75 miles to empty. (They told me later it had about 2 gallons left.) They found a faulty fuel sender (left side) and an internal failure of the fuel pump housing (a crack, I think they said). They replaced them, put it all back together, and problem is solved. Just fueled up today a touch above 1/4, and it took 14.0 gallons.