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Message: <blockquote data-quote="Mkeeton1" data-source="post: 112413" data-attributes="member: 18975"><p>Had a so called mechanic come have a look at it, all he did was drive it a bit and said the tandem drive pump is bad. I asked him several times about charge pressure, he did if I had no charge pressure it wouldn't move at all. Again charge pressure light is on and no pressure where manual says to check it. Which is where the pressure sending unit is by filter head. He says there shouldn't be any pressure there. Then why is that where the sending unit is??? Does anyone verify that the charge pressure is built by the charge pump and then sent to tandem drive to supplement? How can no charge pressure mean the $3000 tandem drive is bad. I have no pressure after the charge pump before the tandem . Charge pump is good . Could it be the charge pressure relief valve?</p></blockquote><p></p>