What’s this garbage in my float bowls?

[JMD]

Took my edelbrock carb apart tonight to fill the bowls with fuel and to my surprise I found a nice pile of crud in both bowls. Truck was running fine before I pulled the engine, but I’m wondering if this is a sign that my tank is starting to rust. The junk was kind of a rust colored powder that wiped away easily. There was about a tablespoon in each bowl.
Everything fuel related was brand new last year except for the tank, which is original. I have a Russell in line fuel filter right before the carb and there was nothing in the screen. Any ideas where this crap came from?
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[AJC]

Its rust just so fine it goes threw the filter. Whats the micron rating of your filter?

[toolboxchev]

I had the same crud in my edelbrock just cleaned it out last week. I had not nearly the amount in both bowls, just the passenger side. I also noted that I did not have any aluminum corrosion either. I drive my truck everyday. Standard cheapo fuel filters and my tank is fairly clean.

10 years I have not had that much in mine. Time to check the tank I would say, just a turn of the lock ring and you get great visibility in there...

[mike16]

yep its rust. time to replace the tank.

[HO455]

What is the micron rating of your filter? I run a 140 micron before my fuel pump (electric) and a 40 micron just before the carb. You should be able to go as low as a 10 micron just before the carb without any issues.