ive worked on cars for quite some time!! there is actuall clamping dies that go on the plastic lines to press in the brass fitting in place. and a small hand clamp to do the actuall pressing. if the fuel line is the big fuel line it will have much more than 7 to 10 psi on it, more like 35 to 50 psi. and if it is the small line, it will have nominal 0 pressure, but flow. i would be hesitant on using the compression fitting unless its rated for fuel, maybe your local parts store will have the pressing tool available for loan.... id check into it!!
2010 rytera x. apache rest, truglo 5pin. 8in shockbocker 1000 stabilizer. norway g2 string tamer Huch-n-Son strings
2010 rytera z apache carbon rest axt primal x5 sight