Quote:
Originally Posted by xjbubba
I'm sorry, but I don't buy it.
The pump's operation, other than not running if the ECM is not getting an input from the ignition module, is not affected by the CPS.
If so, I'd appreciate the "science".
Quote:
Joe_peters
I think the "science" is there for the major part of his trouble--did you read his original post on 2-10-2009?
I don't know why his pump is less noisy now, but at least his xj is running, which I think was the major part of his goal.
__________________
What I meant by "science", was, what is the possible causal link between the CPS being marginally inoperative and the fuel pump humming?
Easy to see how an intermittent CPS signal would cause misfiring, and even cause the fuel pump to momentarily cease pumping, but cause humming?