🚛 Testing for Air in Fuel on a Mack MP8 – Suspecting Injector Cups! 🛠️💨In this clip, we’re diagnosing air in the fuel system on a Mack MP8 engine. Air intrusion can cause hard starts, rough idling, power loss, and excessive smoke. To pinpoint the issue, we systematically canceled out the fuel lines, fuel pump, and fuel housing, leaving us to suspect injector cups or injectors as the source of the air leak.🔧 Why air in fuel is a problem:❌ Causes engine misfires and rough running❌ Leads to exc