The air charge in a bladder tank should be 2 PSI below the pressure switch ON setting. In other words if the pressure switch is a 30-50, then the tank air should be 28. -If the pressure switch is the higher 40-60, then the tank air is 38. These tanks are all charged at the top and you can check air pressure there also.
How much horse power sould a truck have?
If tank has rusted through, tank will leak. If bladder goes bad, tank should not leak.
Check the manual or look online for the manufacturers specifications. This IS important that you do not over inflate the bladder.
Generally the pressure in the tank air bladder should be 2 psi below the water pressure switch kick in (pump turn on) point. In this example of 48 to 68 Lbs the air bladder pressure should be 46 psi. This pressure should be measured with the tank empty of water, that is to say NO water pressure applied. NEVER over pressurize the air bladder - it would be better to under pressurize if in doubt. Some tank manufacturers may recommend a different PSI differential so check with the tank literature or the manufacturer.
The water pressure depends on the residual air pressure in the tank. Normally it should be between 30 -50-psi. Tank air pressure is important, it should be about 27-29 when water is nearly empty.
Around 20 litres maybe more
The bladder.
Check the manual or look online for the manufacturers specifications. This IS important that you do not over inflate the bladder.
It depends on which pressure switch you have. The total pressure with a 60-80 switch is about 84 psi.
The recommended amount of air pressure in a bladder tank is typically around 2 psi below the cut-in pressure of the water pump.
In this case the only proper thing is to get a new bladder tank.
bladder tanks are much better for the pump and will be fine as a replacement.