It should have ended with a trip to a BP service station for late-night snacks, but instead it ended with one having his life support switched off in hospital and his close friend charged with offences relating to his death.

Max Summerfield, 21, died in Westmead Hospital on Monday morning from severe head and chest injuries sustained when he was run over by a car on Sunnyholt Road, Blacktown.

Friends paid tribute to the country bricklayer on his Facebook page on Monday, describing him as a “good bloke” who would be remembered for “the constant fun and foolish times”.

“What was a night with harmless intentions turned into your last. Easily proud to say you were one of my closest mates growing up man,” one friend posted.

His girlfriend of two years, Ebony, posted a photo of her holding his hand in hospital.

Police allege Mr Summerfield and his friends got into a heated argument outside the service station about 10.20pm on Friday.

CCTV shows the four men entering the service station together moment earlier; one headed for the ATM while the others bought snacks.

However, outside, an argument ensued and the men began pushing each other.

CCTV shows Mr Summerfield running backwards past the petrol pumps while one of his friends pursues him with his fists up.

It's believed he was pushed or fell onto the road and, seconds later, was hit by an oncoming car.

The 65-year-old male driver, who stopped to help, “has co-operated with police and undertaken mandatory tests at hospital”, a police statement said.

Mr Summerfield's friend, Brandon Sullivan, 25, has been charged with affray and was granted conditional bail to appear in Blacktown Local Court on August 31.

Police allege he used “unlawful violence” towards Mr Summerfield in a way that “a person of reasonable firmness if present at the scene would have feared for their safety”.

He was filmed speaking to police immediately after the incident, with blood pouring out of his nose.

On Saturday, dressed in a forensic jumpsuit, he led police through a re-enactment at the crime scene.

Service station worker Robin Sanhu told Seven News: “I thought they were having fun because they were friends.”

He said he saw Mr Summerfield get hit by the car “on the upper part of his body to the head and the chest”.

Investigators are appealing for anyone who saw the incident, including any motorists who have dash cams in their vehicles, to call Blacktown police or Crime Stoppers on 1800 333 000.