Measuring gasoline level

So from what I've read, using a differental pressure sensor is the best method to find the level of fuel in, for example, a small 6.5hp honda engine. This would be a sensor like so: http://www.digikey.com/product-detail/en/MPX53DP/MPX53DP-ND/951812 I'm still left wondering if these are waterproof, or more importantly, how exactly you would hook it up/connect it to the gas tank and outside air. Can anyone shed some light on this for me?

braunshedd:
So from what I’ve read, using a differental pressure sensor is the best method to find the level of fuel in, for example, a small 6.5hp honda engine. This would be a sensor like so:
http://www.digikey.com/product-detail/en/MPX53DP/MPX53DP-ND/951812
I’m still left wondering if these are waterproof, or more importantly, how exactly you would hook it up/connect it to the gas tank and outside air. Can anyone shed some light on this for me?

Typically these kind of sensors are only recommended/specificed for air service, not liquid and certainly could have problems with hydrocarbons. Here is something from the datasheet that may lead to more specific information about limitations and cautions:

The MPX53 series pressure sensor operating
characteristics and internal reliability and qualification tests
are based on use of dry air as the pressure media. Media
other than dry air may have adverse effects on sensor
performance and long term reliability. Refer to application
note AN3728, for more information regarding media
compatibility.

Lefty

Recover the float mechanism from a car (automobile ?) fuel tank and use that. They are designed for use in a petrol vapour atmosphere.