Re: Honda 2HP fuel tank
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I've had this happen with plastic gas cans in my garage, if they sit for a few months mostly empty they suck in and create a vacuum.
My first thought is that the fuel is oxidizing and consuming the oxygen to create a vacuum.... We've all done the water into a glass with a match trick right?
My second thought is that it's breathing from hot to cool and creating a vacuum like a canning jar does when it cools....... heats up, forces out the gasoline vapour, cools and creates a vacuum. The cap acts like a one way flap valve.
Solutions could be leaving the tank full during storage. OR leaving the cap cracked open a little.
Maybe someone knows which answer is correct.
On Tue, Jul 12, 2022 at 11:02 AM Bob Larkin <bob@...> wrote:
I was just doing routine maintenance on my BF2D Honda (16-years old). I noticed that the forward side of the fuel tank was "sucked in" around a half inch. This was early this morning and it was around 70F, and not hot, so when I opened the cap, it popped out a little bit. I put a big screw driver in the tank and could push most of it back to be rounded out, instead of pushed in.