We recently purchased a 1978 300D, and thanks to all of the knowledgable posts, we have successfully managed to fix most things.

Does anyone know what kind of debris is clogging the primary filter? We change the primary filter about once a week. We have been through two secondary filters, have drained the fuel tank, and changed the fuel lines. Things have been better since we started to add the Redline Diesel Fuel Catalyst, but it has still persisted for the last month.

Any advice would be greatly appreciated.

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