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Old 07-11-2009, 05:26 AM   #1 (permalink)
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re-filling a liquid filled gauge?

Is there a way to re-fill a liquid filled gauge? I have an auto meter pro comp gauge that needs re-filled and before I start to take it apart, I was wondering if it is possible and how to do it. Thanks for any advice you all can give.
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Old 07-11-2009, 08:38 AM   #2 (permalink)
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Re: re-filling a liquid filled gauge?

I personally think liquid filled gauges are a gimmick... How did the fluid come out?
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Old 07-11-2009, 09:03 AM   #3 (permalink)
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Re: re-filling a liquid filled gauge?

unless its on something that pulsates(maybe a compression tester- but even then not used enough to wear it out) the oil filled stuff really dont serve a purpose...most of the gages we buy at work are hydraulics, and when solenoids shift the pressure spikes will rapidly pound the guts out of a non-filled gage, but I just replaced one the other day that was oil filled on a air supply line- a waste of money at that point...high pressure/hydraulic shock, yes, otherwise no...on low pressure sevice Ive seen inaccuracys too due to the oil being non-compressible...on lower pressure(under couple hundred psi especially) the oil filled gages must be mounted vertically and the rubber 'plug' will have a lever you flip to allow it to breathe, otherwise the bourdon tube or whatever its called cant expand properly without trying to compress the oil- and expand the lens/case...we have some systems that run high pressure 3~10KPSI where a non-filled gage would probably have the needle bend the first time pressure suddenly released...hard to even put a snubber inline at very high pressures to reliably protect the gages...quality filled gages usually use glycerine also- not oil, refilling is usually by a rubber plug at the top of the gage, or a twist-lock type of lens- but cheaper gages just have three 'staked' points in the case to lock the lens in place, cant fix those...as relatively cheap as they are, we usually just toss them if they act up- but some of the larger/high pressure, or high accuracy types we clean/refill/rezero and test against a master gage...
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Old 07-11-2009, 09:26 AM   #4 (permalink)
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Re: re-filling a liquid filled gauge?

4V429... Please separate a sentence or two when doing these long paragraphs...

It's only a personal preference for myself but it makes the read a lot easier on the eyes.

Thanks!

Gary
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Old 07-11-2009, 10:08 AM   #5 (permalink)
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Re: re-filling a liquid filled gauge?

Liquid filled gauges are used where shocks are common. There is usually a rubber plug that can be removed to refill them.
Look on the top or the back of the gauge.
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Old 07-11-2009, 10:26 AM   #6 (permalink)
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Re: re-filling a liquid filled gauge?

I had the same problem with my auto meters. All pro-comps. I bought them for 2 reasons
1 The previous sport comp oil pressure gage ticked so badly i thought i was going to scream. Was an annoying sound like something under the dash was rattling. The oil filled was much quieter.
2. I wanted the rest to match. (I'm fairly anal like that)

However i did have an issue with my water temp leaking and i was going to refill it but the mechanical tube burned through on my header in the ol 2.0 setup so i just trashed the whole gage.

As 429 mentioned they have issues with heat and expansion etc. When drove it all the time and it was parked in the sun for extended hours id notice the vacuum gage would be off the needle rest. Never really bothered me though.

If you need to refill it there was a slotted screw on both of my water temp gages and just get some "glycerin" and pour it back in. Just leave some room for expansion and leave the screw slightly loose to allow it to breath if you need it to stay accurate.
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Old 07-11-2009, 07:39 PM   #7 (permalink)
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Re: re-filling a liquid filled gauge?

I would agree and you get glycerin at your local drug store. It is also an ingredient in home made bubble blowing solution if you have a little left over.
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Old 07-11-2009, 09:36 PM   #8 (permalink)
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Re: re-filling a liquid filled gauge?

oHHHH, so some oil pressure gauges will bump with the stroke of the oil pump? Weird...

I've seen fuel pressure gauges do it but never an oil pump.
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Old 07-11-2009, 09:53 PM   #9 (permalink)
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Re: re-filling a liquid filled gauge?

Quote:
Originally Posted by FEandGoingBroke View Post
oHHHH, so some oil pressure gauges will bump with the stroke of the oil pump? Weird...

I've seen fuel pressure gauges do it but never an oil pump.
Guess so, both my auto meters did it . They are mechanical though. The electric ones will not.
You cant really see the needle bounce per-se, but you can hear them tick badly. At least mine have. It also might be the mounting i have. Its a billet chunk of 3/8 Aluminum. So that may be part of it.
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Old 07-12-2009, 11:50 AM   #10 (permalink)
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Re: re-filling a liquid filled gauge?

Quote:
Originally Posted by 71hotrodpinto View Post
The electric ones will not.
You cant really see the needle bounce per-se, but you can hear them tick badly.

Electric ones are dampened. It takes a sustained input for a certain time (like a second or so, it varies) to register.
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