[AT] Residual fuel in gas pump hose

[Bill Brueck]

I've wondered the same thing, and it brings to mind a story from a friend who took delivery of farm gasoline a while back but discovered his tank had been filled with diesel fuel.  The coop came out and drained the tank for him and refilled it, no hassle.  When asked about what was going to happen with the mixture of gas and diesel that was pumped out, the driver said it would just be dumped into the gasoline bulk tank.

I presume it's the same long coiled hose that delivers both gasoline and diesel fuel from the truck, too.  Gotta be a few gallons of whatever the last stop got that's pumped into the next tank...so I guess our engines are pretty forgiving.

B²
Bill Brueck
   Pine Island, MN USA

From: AT <at-bounces at lists.antique-tractor.com> On Behalf Of Dean Vinson
Sent: Tuesday, February 14, 2023 8:09 PM
To: 'Antique Tractor Email Discussion Group' <at at lists.antique-tractor.com>
Subject: [AT] Residual fuel in gas pump hose

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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