Springtime is bugtime too. If the bugs are out and about then the algae is too. If you're going to go to the trouble of cleaning the tank screen then check the tank bottom for a drain (it will be a tough one to break loose the first time). Take out as much fuel as you can through the top, then the rest of the water and gunk through the bottom. You can jack the corners of the car to tip the corners of the tank. Put all back together, biocide at full dose, and have plenty of fuel filters at the ready.

__________________
daBenz - 1970 220D