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Benny771 Benny771 is offline
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Join Date: Jul 2008
Location: Canada Ontario
Posts: 783
Originally Posted by JFairman View Post
He forgot an important step.

After turning on the fuel pumps and before taking a pressure reading you're supposed to push in the button under the gauge to purge the air out of the line leading up to the gauge. They put that there for a reason and if you skip that step you won't get accurate pressure readings on the gauge.

You can see the aluminum push button to let the air out of the line in the aluminum block just below the gauge and his gauge is a fancy expensive one that has a clear poly vinyl vent hose coming out below the button so you don't get gasoline all over your hand and on the motor while holding the button down and letting the air purge out.

Some gas squirts out once all the air is purged out of the gauge hose so that clear bleed hose is a nice safe feature.
If the gauge doesn't have a bleed hose rap a rag around it to absorb the gas while pushing the button

Ok, Ive never understood that. Why clear the line?
If fuel is pushing/compressing air at 60lbs is the air pressure not 60lbs? I could see a slightly slower reaction time but it still would quickly even out?
Am i wrong?
Old 09-09-2011, 02:08 PM
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