The crash happened around 5 a.m. Saturday on the 1600 block of South College Drive near Old Baltimore Pike.
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Police say the collision involved a sedan and a tractor-trailer.
The impact of the crash flipped the truck onto its side, causing the diesel tanks to rupture.
The truck also struck a utility police that brought down wires, and left nearby residents without power.
Police say the 76-year-old driver in the sedan was treated at the scene by medics for chest pains.
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He was later taken to Christiana Hospital for evaluation. He is in serious, but stable condition.
The 51-year-old truck driver was also taken to Christiana. He is in stable condition.
The accident remains under investigation.