Hello, if your Pontiac has the 305 or the 350 motor, the fuel filter should be behind the carburetor inlet nut, where the fuel line goes into the carb. Use a wrench to hold the big nut and remove the fuel line. Then remove the big nut and the filter is behind it. Do not drop the spring behind the filter. or break the sealing gasket around the big nut. Thanks
Auto Service Technician
40 year GM Tech. +30 Certified. ASE Master Tech.(expired, retired) Medium Duty, Heavy Line, Retired