3rd Fuel Pump in a year just failed

[Radosity]

I own a 2008 Toyota Yaris 4d compact. Over the past year, I've had the fuel pump replaced twice. Every time, the symptoms are the same... no sputtering or acceleration issues, just all of a sudden while driving it'll stop accelerating and that check engine light pops on.

The first time I was just told that it was likely because of letting the car run on low fuel. From research now, I know that that's largely a myth. I took it to heart and never let my car run beneath a half/quarter tank. It went out again about 5 months after it was replaced, same symptoms. It's under warranty with the mechanic, so I took it back and he said that they thought it might be the fuel injector, but they see no way to really get to it.

Now, it's just gone out a 3rd time. I've checked the fuses myself, they're all fine. The car still has power, it just turns over without ever firing up again. What I wanted to know is, have any of you experienced this sort of thing before with this model? I'll be able to take it back to the mechanic again under the warranty, but it'd be great if I could go back offering him some ideas as to what it could be. Thanks for any help/ideas.