siphoning easy
Hotshot
Joined: Aug 2006
Posts: 17,398
Likes: 317
From: Whittier, CA
based on this chart, 1/4in tubing, (1/2 the smallest here) would be around 3 gallons per minute and 180-200 gallons per hour..
GPM/GPH Flow based on PVC Pipe Size, ie, How much water can flow through Sch 40 Pvc Pipe Size 1/2" 3/4" 1" 1.5" 2" 2.5" 3" 4" 6"
easy to empty a 35 gal tank.. 10 mins..
sam
GPM/GPH Flow based on PVC Pipe Size, ie, How much water can flow through Sch 40 Pvc Pipe Size 1/2" 3/4" 1" 1.5" 2" 2.5" 3" 4" 6"
easy to empty a 35 gal tank.. 10 mins..
sam
.25"dia. = .02"^2
.50"dia. = .79"^2
So approximately 1/4 the flow. But your point is a good one anyway.
Even less through a Schraeder valve. But I guess it has been done and works okay. Good info to squirrel away.
Hotshot
Joined: Nov 2000
Posts: 11,591
Likes: 14
From: Pflugerville, tx
Point of fact, .25"dia. is not half of .5"dia. It is much less than half.
.25"dia. = .02"^2
.50"dia. = .79"^2
So approximately 1/4 the flow. But your point is a good one anyway.
Even less through a Schraeder valve. But I guess it has been done and works okay. Good info to squirrel away.
.25"dia. = .02"^2
.50"dia. = .79"^2
So approximately 1/4 the flow. But your point is a good one anyway.
Even less through a Schraeder valve. But I guess it has been done and works okay. Good info to squirrel away.
| it is 1/2 the diameter of the smallest one in the table I referenced.
Sam
Elder User
Joined: Dec 2008
Posts: 745
Likes: 4
From: North Carolina
It may be 1/4 the cross sectional area, which means the average fluid velocity will be 4x higher in a 1/4" line vs a 1/2" line, however the important factor in flow rate is pressure drop.
At 1gpm a 1/4" line will produce a pressure drop of about 40 psi/100ft
At 1gpm a 1/2" line will produce a pressure drop of only 1.5 psi/100ft
that is almost 30x higher pressure drop which indicates that siphoning with a 1/2" line will produce approximately 30x higher flow rate than the 1/4" line.
That PVC flow rate chart is decieving. It says "gravity flow" but you have no idea how long the pipe is or how many feet of head are pushing down on it. I am guessing you will get much lower flow rates. Get the biggest piece of tubing you can jam in there.
At 1gpm a 1/4" line will produce a pressure drop of about 40 psi/100ft
At 1gpm a 1/2" line will produce a pressure drop of only 1.5 psi/100ft
that is almost 30x higher pressure drop which indicates that siphoning with a 1/2" line will produce approximately 30x higher flow rate than the 1/4" line.
That PVC flow rate chart is decieving. It says "gravity flow" but you have no idea how long the pipe is or how many feet of head are pushing down on it. I am guessing you will get much lower flow rates. Get the biggest piece of tubing you can jam in there.
Posting Guru
Joined: Aug 2007
Posts: 1,714
Likes: 1
From: Canton, IL
If you use the in-tank fuel pump to empty the tank at a fuel line in the engine compartment, don't forget to change the fuel filter before running the engine. if varnish has started to form, the particles may clog the filter. That varnish is some sticky stuff.
Elder User
Joined: Dec 2008
Posts: 745
Likes: 4
From: North Carolina
Or better yet, pull the filter out and put a hose over the filter inlet and pump it out from there. Careful though, that pump uses the gas in the tank for cooling.
Posting Guru
Joined: May 2003
Posts: 1,362
Likes: 2
From: Juneau, ALASKA
How old is old? I've stored vehicles for over a year with the gas tank full to prevent condensation and then driven them till old gas is gone then dump in a can of engine conditioner / injector cleaner fill up with fresh gas an good to go.
Someone ask what to do with it if you did drain it put it in 5 gallon cans and put one can in each time you fill up so you dilute it with fresh gas.
Someone ask what to do with it if you did drain it put it in 5 gallon cans and put one can in each time you fill up so you dilute it with fresh gas.
Thread
Thread Starter
Forum
Replies
Last Post
lameousername
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
3
Sep 6, 2015 04:17 PM
