TD4 BMw engine, rear wheel fuel pump

i am running the beast on bio, before anyone says i read virtually every post on here and prepared to risk it, the only issue i have is the rear wheel fuel pump keeps packing up, apparently as the bio is thicker and not as much lube in the fuel, does anyone know a way round this or where i can get a suitable fuel pump that will last more than 2000 miles, thats how long the last one has lasted, and incidently after modifying the heater plugs onto a rocker switch, it runs great when the fuel pump doesnt get lazy.
hope someone can help
thanks
j

Think I'd be more worried about the chemicals in bio eating into all the seals in the fuel system. BMW & Landrover tell you not to use bio for a reason. Remember Top Gear ran a 330d in an endurance race on bio & the seals started to fail quickly.