Carb experts wanted!

[mcgovern61]

dan filipi » Thu Jan 12, 2017 7:54 pm[/url]":3dr4x2wu]
Well sure sounds like siphoning...but I can't see right off how a float valve leaking would cause a siphoning on the gas in the bowl if the petcock is closed and in fact the petcock is not leaking by.

Beats the daylights out of me too. I am just trying to figure out a reasonable solution as to why this happens. The carbs are still dry in the '82 with the petcock closed. Tried to start and nothing there. That seems to further confirm that the petcock is not leaking even with the pump pulling.

 

[Tom_Charlton]

mcgovern61 » Sat Dec 20, 2014 2:45 pm[/url]":1gscivmt]

dan filipi » Sat Dec 20, 2014 1:55 pm[/url]":1gscivmt]
The best answer will be from the first person that puts a pressure gauge on it lol.

:smilie_happy: (I wish I had a gauge...)

Guage not needed.

:read:
Pressure exerted by a column of gasoline:
Height 4.5 ft = 1.4 psi
Height 9 ft = 2.8 psi
Height 13.5 ft = 4.3 psi

If you are a hydro-statics person, Pstatic fluid = ρgh where ρ = m/V = fluid density, g = acceleration of gravity, h = depth of fluid.

Or do like I did, Google it! And No, I'm not a carb expert.

It's freezing rain here and I've got nothing better to do.

Tom

 

[mcgovern61]

PurpleGL1200I » Fri Jan 13, 2017 11:24 am[/url]":1kq1m7hd]

mcgovern61 » Sat Dec 20, 2014 2:45 pm[/url]":1kq1m7hd]

dan filipi » Sat Dec 20, 2014 1:55 pm[/url]":1kq1m7hd]
The best answer will be from the first person that puts a pressure gauge on it lol.

:smilie_happy: (I wish I had a gauge...)

Guage not needed.

:read:
Pressure exerted by a column of gasoline:
Height 4.5 ft = 1.4 psi
Height 9 ft = 2.8 psi
Height 13.5 ft = 4.3 psi

If you are a hydro-statics person, Pstatic fluid = ρgh where ρ = m/V = fluid density, g = acceleration of gravity, h = depth of fluid.

Or do like I did, Google it! And No, I'm not a carb expert.

It's freezing rain here and I've got nothing better to do.

Tom

Thanks Tom, I feel better now. :smilie_happy:

 

[dan filipi]

Ok I'm setting up a new server for the forum right now (more on this later) but I need posts to read so, how much quantity of gasoline is in a column in the above example?

 

[dan filipi]

Found it I think...a column is 1 square inch of liquid?

So question remains....pressure at the end of a hose connected to the carb is dependent on how much gas is in the holding container at a given height.

 

[Tom_Charlton]

The important figure is the height of the liquid, not the volume of the liquid.

A tube a foot in diameter and ten feet tall will register the same pressure (PSI) at the bottom as a tube an inch in diameter and ten feet tall. The tube 1 foot in diameter holds a lot more and thus weighs more, but the gauge is measuring pressure, not weight or volume.

Pstatic fluid = ρgh where ρ = m/V = fluid density, g = acceleration of gravity, h = depth of fluid.

Fluid density of gasoline doesn't change regardless of how wide the column is; the acceleration of gravity doesn't vary.

Thanks for giving me something to do.