Gasoline Telegauge

  • ilikescars
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26 Jan 2008 22:13 #9299 by ilikescars
ilikescars created the topic: Gasoline Telegauge
I just finished installing a new capillary line from the gas tank to the gauge under the dashboard. Here is some interesting information that I dug up on the "science" behind this gauge:

The Telegauge uses the level of gasoline in the tank to maintain an air column within a vertical pipe in the tank, which would then be at a pressure equal to the hydrostatic pressure at the bottom end of the pipe (which is open). This pressure is then indicated on the dashboard, using a manometer.
The fluid for the gauge is tetra-bromo-ethane C2h2Br4, which is four times denser than gasoline, so the manometer does not have to be as tall as the depth of the tank. The liquid should be dyed red, using Sudan Red, an aniline dye used to color waxes, solvents and gasoline, also used in laboratory work.

Or, you can always use the old tried-&-true dipstick, which never hurts in a pinch.

Mark

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  • mikespeed35
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27 Jan 2008 04:10 #9300 by mikespeed35
mikespeed35 replied the topic:
I just put gas in my speedster for the first time. Gas gauge seems to work good. I have heard that they are not very reliable, Guess I'll find out soon.
CORDially Mike

Mike Huffman

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  • ilikescars
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28 Jan 2008 14:34 #9319 by ilikescars
ilikescars replied the topic:
Mike: You would need a bicycle pump to purge the capillary line if it's not working. Requires some dexterity to disconnect line under the dash.

Mark

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31 Jan 2008 06:05 #9358 by mikespeed35
mikespeed35 replied the topic:
You can learn how to make the adapter for the pump in SK back issue.
CORDially Mike

Mike Huffman

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  • Greg Frownfelter
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01 Feb 2008 01:18 #9370 by Greg Frownfelter
Greg Frownfelter replied the topic:
if the gage fails try pulling a vacuum on the system with a mighty vac
pump. it should hold vacuum overnight. then try again. you can calibrate
gage end by inserting tiny wires, keep the yard stick handy it always
works.
greg

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