Green’s Dictionary of Slang

1. (drugs) marijuana mixed with insecticides.

2001

ONDCP Street Terms 9: Fuel — Marijuana mixed with insecticides.

2. (drugs) phencyclidine.

1984		Abel Dict. Drug Abuse Terms.
2001		ONDCP Street Terms 9: Fuel — [...] PCP.

3. (US campus/Aus. prison) food or drink.

1933		J.E. Grinstead ‘Old Pard’ in Goodstone Pulps (1970) 66/1: All trailed into the Shorthorn Saloon, to take on a little fuel for the grade up to the dance hall.
1985		T. Wolff ‘The Sister’ in Back in the World 88: Jack said, ‘Don’t hog the fuel, Jack,’ and made a drinking motion with his hand’.
1988		‘Siriusly’ Speaking in Just Us (H.M. Prison, Beechworth, Vic.) Dec. 26/1: fuel n. Cup of tea.
1990		Tupper & Wortley Aus. Prison Sl. Gloss. 🌐 Fuel. A drink of tea (Ponton).
1997		Eble Campus Sl. Apr. 4: fuel – caffeine or food.