The clear hose at Clark Rubber is described as vinyl & food grade and lot of people don't recommend clear hose for fuel but I've never had a problem with using it on a lawn mower it does harden over time ,been using clear hose on mowers for decades ,I wouldn't use it on a car or boat but have used some just temporary on the fuel suction side on a car when I put a 4 litre container in the engine bay just to start an engine.
Haven't had the clear hose crack unless it's decades old.
Even if they ask me at the shop what I want the clear hose for and I say mower fuel line they don't say not to use it.
I think it just depends on the quality of the clear hose if it's made too cheaply it's going to melt when you add fuel to the hose.
