May I use an inflator hose for gasoline?

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Without comment on actual suitability of an LP hose in place of fuel line ...

will restrict flow
There is a big difference between the fuel flow requirements of a 6hp compressor and a 25, 40, 60hp outboard ... The restriction may be functionally meaningless in this application.
 
To answer your original question with regards to material composition. There is no single standard for hoses and they have historically been made by a variety of materials.

For HP hoses, the following construction has been fairly popular:
  • Inner tube made from Nitrile, quite often a Nitrile-Vinyl mix.
  • Middle layer of braided Kevlar
  • Outer layer of a Neoprene blend or rubber
For LP hoses, this has been popular:
  • Inner tube made from Nitrile. Some manufacturers use thermoplastic polyurethane (TPU) based on polyester.
  • Middle layer of braided synthetic textile
  • Outer layer of a Neoprene blend or rubber
There are other material combinations and uses. The inner tubes I know of seem to be made of fuel resistant materials.
However, under no circumstances would I ever consider using one of these hoses for the use your propose. There is always the chance that a manufacturer picked a different material from I wrote above and the consequences could be dire.

The Schrader-valve is almost guaranteed to break in gasoline if I had to take a guess.
OK you conviced me, I will not use an inflator hose.
 
I don't, but that design of quick-disconnect is available from other sources in various diameters. McMaster-Carr, for example: McMaster-Carr You may want to look for a material rated for gasoline contact, though.
OK, I will look for a gasoline quick disconnect, thank you
 
Fuel line - hose, braided hose, and metal tube - is cheap and readily available. I'm not sure why you would want to use anything else.
I need a quick disconnect to separate fuel tank for transport.
 
For outboards
 

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