Diesel is commonly used as fuel for engines and is a mixture of the hydrocarbons which are obtained from fractional distillation of petroleum. Hydrocarbon pneumonitis following aspiration of diesel during siphoning of diesel though infrequent but can happen in people who are employed in the automobile field. We present a case of a 23-year-old male mechanic who aspirated diesel while siphoning it from fuel tank, developed fever, cough & bilateral pneumonitis. The patient received the symptomatic therapy at a local hospital. However, 3 days later, he developed breathlessness and was brought to R.L. Jalappa Hospital for tertiary care. Despite all resuscitative measures, the patient succumbed to death after 6 hours of treatment. Autopsy examination revealed haemorrhagic lungs with consolidation. Histopathological examination showed the features of bilateral pneumonitis. Literature pertaining to accidental aspiration of diesel during siphonage are rare. The complications and clinical spectrum are alarming after ingestion. So, it is vital to prevent hydrocarbon ingestion.