Which clear tube? There is a clear tube that runs from the tank, near the top, to the low-pressure inlet fitting on the side of the trailer. This is a vent tube to let air out of the tank as you fill it, and to warn you when it is close to full.
On some TMs there is a clear tube from near the top of the tank to a fitting in the floor. This is an overflow drain in case you overfill the tank. It appears in Lederhos' first pic above.
There are clear tubes with white mesh embedded in the wall of the tubes - these are the inlet and outlet hoses connected to the pump. You can see these in the fifth picture from Lederhos, above.
Picture?
Bill
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