Where to input into Red Matter Furnaces with Redpower Tubes

[yankees1327]

When I try to hook up tubes to a red matter furnace in order to smelt things, sometimes it will work like it is supposed to when you put in from the top, and put in the smelting slot of the furnace. But after a while it will start putting things into the fuel slot and when that is full, it wont input at all. This is really getting me frustrated, so I was wondering if there is anything I am doing wrong or a workaround for it before giving up and using induction furnaces.

[yankees1327]

bump

[The_DarthMoogle]

Don't bump. Be patient.

Try putting it in the left.