Quote:
Originally Posted by CompClassics
I believe there is fluid on both sides of the isolator, otherwise you would end up with a false reading. Fuel on one side and glycerine (?) on the other to the gauge.
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Yes, that may be true, thinking about it now,

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Almost any non-combustible non-corrosive fluid could be used.
There will be small amounts of air, depending on how fussy one is to bleed it out.
Gary