Primary fuel filter

[MAScontractingllc]

Yes sir.... You are correct

Unfortunately we do not have a fuel restriction gauge

When I say primary filter I'm referring to the frame mounted (housing made by paccar) from the factory and secondary fuel filter is mounted to the block...I'm not sure if that's correct terminology though

Primary fuel filter (frame mount)we use a Fleetguard FS36401 (10 micron)
Secondary fuel filter (block mount) we use a Fleetguard FF5825NN (4 microns)