I read a post on using mq1 as a "universal" sensor; but can't find it -- mq2 and mq8 seem like good choices -- I want to detect if a leak occurs in a gasoline powered boat & shut down the the engine if it detects a leak.
Really old thread - but I'm looking for something that can determine gasoline (and diesel) fumes as well.
Did you ever track this down?
Is google broken in your country ?
I google "gasoline sensor" and I find hundreds of thousands of hits. A lot of them are about sensors for natural gas however.
The problem with detecting gases, is that there are not many ways that work, and simple devices which work by detecting changes in the conductivity or capacitance of the air, cannot distinguish between gases very well.