Before replacing rear left airstrut my airmatic pump stopped inflating the struts. After replacing the strut and the rear height sensor the pump runs for a few seconds and then shuts off. I also need to replace the front struts due to a slow leak on the right side but I can't do it if the pump won't run. All fuses and relays are good. Is it an issue with a valve or co

From my observation the only way the pump can stop after few seconds is when it reaches designated pressure (ca 160 psi).
You need a scanner that can monitor the pressure and also operate the valves.
Sounds like your valves are not operating.

that's what I'm guessing also.. Thank you for your time and input!