Fuel Pressure Gauges "Dry vs Wet"

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They may be talking about the gauge itself. Oil filled gauges are sealed with oil inside to stop needle fluctuation on applications with a lot of vibration. Never put a fuel pressure gauge inside a car.
 
toolmanmike said:
They may be talking about the gauge itself. Oil filled gauges are sealed with oil inside to stop needle fluctuation on applications with a lot of vibration. Never put a fuel pressure gauge inside a car.
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unless you have the isolator. that keeps the fuel outside and usually glycol or some other fluid in the line to the gauge.
 
I use a dry gauge, I tried a glycerine filled gauge but was having to pop the plug on the top to equalize the pressure to get the thing to read right, got tired of it and put on a dry one and it works great.

My gauge is under the hood and I have never had a problem where the car was falling on it's face or stopped running the I needed to know the fuel pressure except for setting up the carbs and adjusting the regulator every once and a while.
 
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NHRA rules back when I ran Super Gas stated no fuel inside vehicle. That is why the advent of the Isolator.
 
I wondered what the isolator was about.
 
Or you could mount your gauges outside the windshield behind the hood. That is why you would see them mounted there. It was the cheapest way. Old School!
 
Mine is on the cowl.

I dont think folks get flagged on it often but it's not NHRA legal to have one under the hood. The gauge can fail and be pumping fuel.
 
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