Lazer,
The single line in you photo that isn't attached to anything is the "pulse" line. It is connected to the back-plate of a two stroke. The pressure and vaccum of the two stroke piston moving up and down actuate the pump diaphram. The other two lines (connected to each other in the photo) are "In" and "Out" fuel connections. There should be an arrow indicating flow. Mounting is up to the installer. The pumps come with a strap to mount to the engine mount, fire wall etc.
Because the four stroke doesn't have the pressure/vacuum/pressure/vacuum cycle like a two stroke has, the pump you have wont work (well). Perry makes the "shaker" version which uses engine vibration to actuate the pump.

http://www.perrypumps.com/prod02.htm