I have connect a syringe pump to my delivery module
First i use the module to delviery CO2 into the syringe pump(i am doing SFC ) then I turn off the CO2 pump in the module turn on the Co-solvent pump to deliver co solvent and use the syring pump to pump CO2.

The problem is that the front pressure keeps on increasing while the back pressure remains constant( even after a long time like 1 hour) . The front pressure sometimes increase a lot after I injected a sample

Anyone have any suggestion for that???