My new truck.. 1972 C-20

[Pipesmatt]

Hey guys, im new to the site and i just wanted to say hello! My names Matt snd i bought a 1972 C-20.. Thanks for adding me.. im here to learn more about my new buy and save some cash by tinkering on this bad boy myself.. sooo, ive had a problem with my new Quadrajet carberator.. it would run fine for a day, then she would act like the idle was to low and stall.. after taking the carb off, i noticed sand in the carb filter.. i automatically checked my inline filter and sure enough it was full of sand too... i pulled my gas tank today and cleaned it out... absolutely no rust, but i got about a half cup of this weird looking green sand... this stuff is so fine, it got through both filters... im just at a lost of words... i thought maybe the previous owner sand blasted the tank but this sand is getting through a 20 micron filter... very weird.. but yup, thanks again for the add and im sure you guys will be hearing from me... have a great evening!