Are these genuine AR parts? Is a garage doing the job (i.e. are they actually fitting the new part they're charging you for?). It's strange that you been constantly knobbled by such a rare (?) problem.
Especially when you consider Jorge has the lowest mileage 155 here........whats the fuel quality like where you are? Perhaps crap fuel is causing premature failure but I have no idea why.......electrical problem???
Yes, they are genuine parts, and like you say wrinx fuel quality is not the best here.
I always use the liqui moly octane plus because of that problem.
Government had announced a new 98 octane fuel at the new year but..............................................we are still waiting it.
It´s the internal resistance that get mud so the panel instrument gets nut and begin to go from empty to full without stop.
I'm not convinced. My old dad was always having trouble with his fuel sender until I discovered he was fixing it himself. In the end he got fed up with it and fitted a whole new arm/sender unit and never had any more trouble. I wonder if your garage is just soldering up (etc.) the old one ...