im not sure if this is just specific to my blazer but i have an 84 k5 and i think im havin trouble with the gas gauge. whenever i fill up the needle never goes all the way to full and sometimes doesnt make it past the 3/4 tank mark. normally i wouldnt care about something as minute as this but its a little disconcerting because i dunno if whens its on empty if its really empty or not. also whenever its on empty and i fill up it seems like i only put about 20 gallons in it each time. just wonderin if this is common or just my problem. some tips on fixin it would be apprecaited. thanks.