Or a cheap voltage regulator from say 12v down to 9v ?

Plenty of very cheap power supplies available for 9v etc

can anyone tell me how to get the tank pump sender unit out of a 2003 corsa c 1.7 dti Please I would presume under the rear seats is a good place to start, you'll find an access panel to the top of the tank ( The Combo C van is the same...except no rear seats obviously ) Large lockring around the s...