Most likely, you have a leak that is open in the lock position. The pump has a switch that tells it to shut down at a specified range. If you put your finger on it, it should shut right down.

(Bill did all of the programming on the site, and I will say he did a helllllllllll of a good job!)

Thanks.

__________________
Benzmac:
Donnie Drummonds
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS