Subtopic: Selection, operation, maintenance and repair of I.C. engines
Question Statement:
Air bleeding from the fuel delivery circuit of an agricultural tractor diesel engine is mandatory when:
Options:
(A) Air bubbles enter the fuel lines after fuel filter replacement or running out of diesel
(B) The crankcase lubricating oil level is high
(C) The radiator coolant expands into the overflow bottle
(D) The air cleaner oil bath is overfilled
Answer Key:
A
Step-by-Step Solution & Explanation
Diesel fuel injection requires incompressible fluid delivery to attain ~200 bar nozzle opening pressure. Entrained air compresses and halts injection, stalling the engine.