The 650 GS is fuel injected. Your pump and its filter is in the tank. You need to filter your fuel BEFORE it's in the tank.
There are special filters you can buy that fit inside the tank fill hole.
Putting inline filters on FI is tricky. The fuel line is pressurised and cheap filters either restrict fuel flow or they simply fall apart under pressure.
Bikes like the 1200GS have an inline fuel filter also. So look at one of those.
However, this might stop anything damaging your Injector but not your pump.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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