Subaru Impreza Air Conditioner Compressor

I Am Going To Be Doing A Compression Test On My Car, But I Dont Know How I Would Go About Disabeling My Fuel System? I Looked For Some Kind...

95 Impreza It Had No Cold Air At First. I Added One Can Of R134 W/sealant, System Sucked R134 And Sealant In, Gave Colder Air For A While...