Hi Warren

I went through the exact same problem. I bought a new oil bath pump expecting 29.9 hg and got a lousey 27HG. I was ticked!

I had the seller come to my shop to check with a very accurate guage and it said I had full vaccuum. Turns out that the guage you have looks just like mine and is a piece of crap.

I spent the big bucks and bought an expensive liquid filled gauge and it reads correctly. I think Airtech manufactures the guage and It was under $50.00 dollars ( $35.00?)

been there done that.

Fred

i have 2 vacuum gauges and they both read different, this is an interesting read... http://www.fram.nl/workshop/vacuum/index.htm

Hi,

Regarding your pump specs, it should pull -29.9 in Hg.

My EC pump also get -30 in Hg  (very small reading difference depending gauges), so I'm with Warren... Your gauge dont work properly or your pump is damaged.

 



 


    A $1000 electronic device will always protect a 10 cents fuse

should a pump with that spec pull -1 bar is the question i think

That looks similar to the guage that EC supply. 

My pump sourced through EC pulls down to 30 inHG no problem and thats been measured on several gauges now as ive got through 3 catchpots in my time.

The guages can loose accuracy if whacked about but normally it means they over read not under read.

Id check against another guage and if its still the same then your pump is either damaged, or just not up to scratch.

I just retried it with a reinforced fuel hose and still the same all be it the hose is not see through, even wrapped bagging gum tape around the connections?. still the same

If i'm not wrong "-1 bar" is very difficult but should be a bit more than you have now if i'm correct...

Thanks for the reply, just mitty vacced the gauge and pipe and all the connections and pipe are fine, no leaks.

Hello Pete,

you can use "Vacuum bagging cum tape" to seal, wrap it around the connector.

I have the following pump: