My Mercury RIB comes with a hand pump and a pressure gauge.
Mercury Double Action Hand Pump
I attached the pressure gauge to the top of the pump. If I block the hose with a wet towel and pump, I can see the gauge move.
However, when I am pumping into the tubes, the gauge always stays at 0 (whether I am pumping or not). This is my first inflatable boat so I don't know how hard the tubes should feel when inflated to spec (manual says 3.5 PSI).
Anyway, I pumped enough that the tubes feels as hard as, I don't know, breast implant?? The gauge still reads zero. If I open the valve air will blow out like crazy.
Is this normal, or should I get a different pump?
How hard does 1 PSI feel?