I’m assuming this syrup is a thick aqueous solution of sugar, in which case it would settle on the bottom of the fuel tank without mixing with the gasoline. If it did get into the engine, it would likely clog the injector or carburetor, but it would likely just cause the engine to stall from fuel starvation, or blow the fuel pump’s fuse.
What about if you poured a considerable amount of syrup in there instead?
I’m assuming this syrup is a thick aqueous solution of sugar, in which case it would settle on the bottom of the fuel tank without mixing with the gasoline. If it did get into the engine, it would likely clog the injector or carburetor, but it would likely just cause the engine to stall from fuel starvation, or blow the fuel pump’s fuse.