the best way to clean it without taking the tank out, is to probably suck all the junk out of it.

 

i'm not sure of any chemicals, but your best bet might just be to replace the tank since you already got it out.

 

Definitely run some seafoam through the fuel lines, especially since you have the tank off and anything that has accumulated can come right out.

 

Hey 71 --- doc and the guy that told you about the rad shop does do this and here its around 170.00 bucks but well worth it and they say it lasts along time as well

 

170.00? man might aswell spend alittle more and get a new tank then not have to worry about a nice size chunk coming off and plugging up ur lines i think a new one from year one isnt much more and just use your old sending unit on it but clean the old sock up from any debrie sticking to or you can just remove it as a temp fix