module may degrade operation of the pump out module similarly continued pumping out above the maximum differential pressure rating of the packer module or packers may degrade the packer module or packers or reduce the effectiveness of the sealing provided by the packers after the condition is reached then pumping by the pump out module may be stopped a fourth step includes filling block 328 the interval with the external fluid carried in the one or more sample chambers in particular a pressure of the external fluid within the sample chambers is typically greater than a pressure of the interval thus by opening the appropriate valves of the downhole tool the external fluid may flow from the sample chambers and into the interval via the flow line 54 and inlet 64 of fig1 or flow line and outlet 312 of fig3 because of the pressure differential between the sample chamber and the interval accordingly the interval is at least partially filled with the external fluid and the pressure of the interval increases as a result of the transfer of the external fluid a fifth step includes recharging block 330 of the interval pressure by the transfer of the external fluid from the sample chamber to the interval in certain embodiments a pressure sensor may be used to measure the interval pressure and the transfer of the external fluid may be stopped e g by closing one or more valves of the.