1982 VW Rabbit - Engine From Passenger's Side Corner
You can see the Bosch fuel filter here, and the (not at all clear) fuel line to the injection pump. That filter is probably very nearly clogged now, and will be replaced Real Soon Now, as I've just finished running several tanks of Amsoil Diesel Fuel Treatment, which is biocidal to kill the algae in the tank, and guaranteed to wipe your fuel system clean. Yes, I can tell a difference.