if diagnostic test say system leak Iis this always related to the fuel system?

Question

Auto Zonetest said system leak. Already paid to have leaking valve cover gasket repaired. Problem still exist

Answer 1

System leakage is related to the Evaporative emission system. What the evaporative system does is trap raw fuel fumes in a charcoal canister and store it to be consumed through the intake system. , When you set a fuel system leak or EVAP leak the first step is check for proper sealing of the fuel cap.