Fuel issues
 

Last week I cleaned the tank screen (practically completely plugged). I rinsed the tank, blew out the fuel feed line from tank to clear filter, blew out return line. Car ran great for a week, then would not start. Found clear filter mostly plugged up. Changed both filters, checked tank screen (clean this time), fueled up, bled air, started up and runs great now. My clear filter is becoming clogged again with a substance that resembles pieces of black material.
Anybody got any suggestions besides changing out the filters??

Sorry, should have told you this before.....yeah, buy a bottle of startron fuel tank cleaner at walmart or a marina. Follow directions on the bottle. Boaters use it all the time....but it kills the nasties that obviously started to grow in your tank.

did you remove the tank
 

It sound like you have a really dirty tank. I would suggest hitting it with some alge-side. but if you have a lot of that stuff it would be best to just remove the tank entirely and clean the entire tank. it sounds like you are treating the syptome and not the disease.
-stephen

I did put an additive in that I got from Advance, that's suppose to clean the injectors etc. I'm wondering if this may have treated the alge even though it did not mention it on the bottle.
Thanks.

It is not biocide unless it says it is. Fuel injection cleaner is not biocide. The biocide should make the bacteria go on through the filter and burn off. I have never had to remove a tank when infected with bacteria yet.

Tom W