If an appendix has ruptured and there may possibly be infection left int he body can it cause renal kidney failure in the future?

Indirectly,if at all. Acute appendicitis with perforation may be complicated by an acute infection throughout the body (sepsis) that can compromise other organs' function temporarily, such as the kidney. Furthermore, an abscess may develop within the abdominal cavity that could take weeks to manifest itself; left untreated, this could lead to sepsis, as well. Either way, the effects on other organs are reversible w/rx.