Originally Posted by
Bitsyncmaster
The fuel pump fuse has popped with one owner because his frequency valve shorted. Another common problem is the WUR heater shorts but often that does not pop the fuse mostly because the wiring to it is small gauge wire and it does not draw enough current to drive the fuse past it blow current. The fuel pumps draw about 7 amps and the lambda and FV only add about another 2 amps. The WRU heater is less than 1 amp.
You can pull the WUR heater connector to maybe get a chance to get you home if that happens on the road somewhere.