I'm sure there's some lighter fluid around here but your grill is gas so you don't need it.
We shall next consider the limiting conditions of stability of the horizontal surface which separates a heavier fluid above from a lighter fluid below.
When the equilibrium at last becomes unstable, the destruction of equilibrium takes place by the lighter fluid ascending in one part of the orifice and the heavier descending in the other.
Pour some lighter fluid on the briquettes if they are not a quick-start brand.
Petroleum products, such as lighter fluid or kerosene, leave a distinctive odor on the breath.