sub tank issue

If you feed a solenoid coil with + 12v and the other wire also has + 12v on it, it indicates the earthing to negative is not correct.
If no neg connections all wires will show 12v with a multi meter.

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If you did not fit it yourself, take it back to whoever did fit it and get them to sort it out. Like previous replies, sounds like an incorrect earthing problem. Macca.

Karl,

I had a similar problem on my Troopy, I suspect from your testing of the wiring however it may be different but here goes. I found that the solenoid was firing but a valve or something inside the setup was not moving and thus everything seemed right except what was happening mechanically inside the value - my fix was a replacement. Hope it helps. In your testing did you take the value out and ensure it actually mechanically switches when energised?

David