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FREEDGUY 
Orange Level Access
Joined: 15 Apr 2017
Location: South West Mich
Points: 5396
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 Topic: Fuel Quantity Left In the Hose ??
Posted: 02 Aug 2020 at 5:09pm |
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Went to the local gas station to fill up a 2 1/2gallon can of mower gas with premium fuel at a Marathon station. I knew there would be some residual "regular" in the hose and pumped the first 2 gallons into the truck and then put the remaining gallons into the mower can. Was I close in "guesstimating" the gallons in the "average" dispenser/pump quantity ? Thanks
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steve(ill)
Orange Level Access
Joined: 11 Sep 2009
Location: illinois
Points: 87651
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Posted: 02 Aug 2020 at 5:36pm |
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my mower and truck both run on 10% Ethanol.
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Like them all, but love the "B"s.
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FREEDGUY
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Joined: 15 Apr 2017
Location: South West Mich
Points: 5396
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Posted: 02 Aug 2020 at 5:42pm |
I've got no issue with ethanol, normally I run mid-grade but it takes me a year to burn through 2 1/2 gallons (small lawn) and thought maybe premium would bring some "snap" back to the old Honda  . Believe me, I burn my share of E-10 in the 5.4  .
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Grayray
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Joined: 12 Sep 2009
Location: Ambridge PA
Points: 3858
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Posted: 02 Aug 2020 at 6:21pm |
To find how much fuel would be in the hose, find the area of the inside diameter of the hose, then multiply by the length of the hose in inches. There are 231 cubic inches in a gallon, so divide by 231 and that should tell you how many gallon are in the hose. For example, the hose is probably one inch inside diameter, probably a little less. Using that, the radius would be 1/2 inch. area=pi times radius squared. Or 1/2 x 1/2 x 3.14159=.7853. Assuming the hose is about 10 feet long, or 120 inches, 120 x .7853=94.25. Now divide by 231 and we get .408 or a little less than half a gallon in the hose.
If the hose is a little longer, there should still be only about 1/2 gallon or less in the hose.
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jaybmiller
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Joined: 12 Sep 2009
Location: Greensville,Ont
Points: 24658
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Posted: 02 Aug 2020 at 6:31pm |
never really thought about it...be nice to get the 'left over' from someone buying premium though.... also makes sense why diesel is always by itself....
well today hasn't been a total loss... Jay
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3 D-14s,A-C forklift, B-112
Kubota BX23S lil' TOOT( The Other Orange Tractor)
Never burn your bridges, unless you can walk on water
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FREEDGUY
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Joined: 15 Apr 2017
Location: South West Mich
Points: 5396
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Posted: 02 Aug 2020 at 6:39pm |
Thank you Grayray
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DMiller
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Joined: 14 Sep 2009
Location: Hermann, Mo
Points: 33885
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Posted: 02 Aug 2020 at 7:40pm |
Current pump systems carry roughly a quart of fuel within them back to the filtration and metering system, the solenoids as to from which tank they draw will send a volume of less than desired product out the nozzle first but should be less than or equal to a quart. Unless find a station with separate hoses for each grade are pretty well stuck with that quart.
Have watched people try to drain the hose after the pump stops and all the systems shut off, MAY get a tenth or two of a gallon off the nozzle and a little off the hose where requires pressure in the line to make the nozzle fully functional.
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PaulB
Orange Level
Joined: 12 Sep 2009
Location: Rocky Ridge Md
Points: 5092
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Posted: 02 Aug 2020 at 7:53pm |
Don't forget about all of the piping inside of the pump after the mixing valve. A couple of gallons for flush everything is always a good idea 
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If it was fun to pull in LOW gear, I could have a John Deere.
Real pullers don't have speed limits.
If you can't make it GO... make it SHINY
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Tbone95
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Joined: 31 Aug 2012
Location: Michigan
Points: 12160
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Posted: 03 Aug 2020 at 6:43am |
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Boss Man
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Joined: 03 Mar 2018
Location: Greenleaf, WI
Points: 617
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Posted: 03 Aug 2020 at 8:10pm |
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I was told by a guy who works on pumps between a quart and quart and a half.
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