[AT] Residual fuel in gas pump hose

[Spencer Yost]

Hey Dean,

I always use non-ethanol for my chainsaw and, at least around these parts, it is always a separate hose or completely separate pump. So I don’t even need to worry about it.

However, if I was using premium, which shares a hose with the other octane rated fuels,  I would geek out exactly like you do. Throw a couple gallons in the truck and then pump into the chainsaw container.

Spencer

Sent from my iPhone

> On Feb 14, 2023, at 9:10 PM, Dean Vinson <dean at vinsonfarm.net> wrote:
> 
> 
> Hello, all.   Been wondering about the quantity of gasoline that remains in a typical gas station hose or whatever other plumbing may exist, between the business end of the hose and the point at which different grades of fuel can be supplied.
>  
> I use a 1-1/4 gallon can for chainsaw gas, and when it gets low I refill it with 1 gallon of premium gas (prior to adding the 2-cycle oil).   Compared to the very small desired quantity of 1 gallon, seems like residual gas left in the hose from the previous use could be a significant proportion or maybe even greater than the amount I’m going to pump… so the net effect would be that I’d pay for the gallon of premium gas that’ll be left in the hose when I’m done, while I actually put a gallon of (presumably) regular in my chainsaw gas can.
>  
> So in an abundance of better-safe-than-sorry geekiness, I pump a gallon or two of premium into my regular can for the gas tractors, or into my car’s tank, and then finish up with another gallon of premium into the chainsaw gas can.   That’s usually accompanied by a vague sense I’m being ridiculous and would most likely never notice a difference if I just started pumping straight into the chainsaw can.
>  
> Anyone have actual knowledge of how the plumbing works and how big of an issue that could really be?
>  
> Thanks very much,
>  
> Dean Vinson
> Saint Paris, Ohio
>  
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