[AT] Residual fuel in gas pump hose

[Dean Vinson]

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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