Originally Posted by Osprey69
Thanks Alan...I believe it is tubes, but will verify this weekend.
That is what I am thinking. It seems similar in design to a more modern unit I had on a prior boat.
Here is a link to the manual for that modern unit, that may help you visualize and determine if yours is similar:
Installation & Operation |
You pull, then push on the knob and it pressurizes the tank and the needle on the gauge is somehow connected in a way to register that pressure without any need for wiring.
First test would be to test the gauge. Connect a piece of spare plastic tubing to one of the two nipples on the back of the device. Blowing into the tube on each of those should move the needle. If it does the Gauge works and the problem is either a blockage or a leak or disconnect in the piping.
If you can get access to both ends of the tubing, you can blow it through to determine (a) if there is an obstruction, or (b) if there are leaks in the length of the tubing.
If it were me I would suspect the connections where the plastic tubing makes its connections. That stuff can harden and lose its seal.