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      12-09-2012, 02:39 AM   #8
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Drives: 2007 335i E90 AT
Join Date: Jul 2007
Location: Surrey, BC

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Originally Posted by JamesM3M5 View Post
The flow sensor is brand new. I had a failure on a different car, swapped my known good one on, and waited for this new one as a replacement. It read dead zero or intermittently, not low. Mine reads, but very low. No clogs, no debris, no scum/muck/crud in the system, it's dead clean and working.

I haven't pulled the nozzles to observe flow/spray pattern, haven't had time, yet. But from what I can discern, the pump just seems weak when pumping against no resistance. Once I put my finger over the outlet hose, it definitely does not build pressure anywhere near 150psi.
Sounds like a pump issue based on what youre saying. I should clarify something though. In my case, the flow sensor wasn't bad. The turbine itself was fine. It was just the C-Clamp cable that connected to the flow sensor turbine that was bad.