Nope, that's not yer fuel filter.
Which fuel line did you have to replace? Do you have the part number? Which two connectors did you disconnect it at?
However, if you follow that line all the way back to the fuel tank...you should find the fuel filter bolted to the frame rail aling the way. Make sure you snap a wide shot of the frame rail that includes the fuel tank on the left and the torsion bar adjuster on the right side of the shot.
I would not recommend that you cut the rubber line there to install a fuel filter. Keep in mind that the pressurized side of the fuel system is considered a high pressure setup. I'm not sure any clamp you install with a low pressure fuel filter is gonna hold and you stand a good hance of having the low pressure fuel filter blowing out. I would recommend that you git the proper fuel lines from the fuel tank to that connector.
Here are the part numbers fer both fuel lines:
From the rubber flex hose (yer trying to cut) to the fuel filter outlet...
TUBE, FUEL MAIN
From the fuel tank flex hose to the fuel filter inlet...
TUBE, FUEL MAIN NO. 2
From the fuel pump bracket outlet to the main fuel line (flex hose)
TUBE SUB-ASSY, FUEL PUMP
Fuel filter and bracket assembly (needs two bolts to secure the bracket to the frame rail)
If you have been running without the fuel filter, it's possible that yer fuel rail and injectors could be partially filled with debris. Have you tried seeing if the fuel return is working from the FPR? You should be able to remove the rubber return hose and put it in a container to see how much fuel is coming out when the fuel pump is running.
Here are the fuel lines with the fuel filter in between...