Drain the tank and replace the filter at the tank. It screws directly into the bottom of the tank.
You don,t need any debris getting into your injection pump.
Being as fussy as I am I would probaly blow out the lines to.
I hope your tank isn't rusting from inside out??

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Ricali

03 C240 4matic wagon
95 300E 234,000
7 prior 240;s 5 still going
81 300sd gone
65 230sl gone
49 Studebaker Champion
90BMW convert.167,000
60 Dodge D-100