...but poorly : ) ('89 TBI K5) Apparently GM used some type of ABS-ish plastic, which is brittle, or gets brittle. It's held to the tank floor with 4 studs and some kind of nut. As I remember seeing here, apparently the violently sloshing gas from an accident is more than the baffles can handle, and the studs shatter (yes, there are a few pieces of plastic in the tank) the bottom of the baffle, creating large holes for the fuel to drain out, rendering the baffling worthless. heres a hastily drawn diagram http://yeagerd.home.mindspring.com/TablePics/k5tbitank.jpg The baffle is about half the depth of the tank, and is open on the top. As I said, it's a very poor design. Effective, but made with very poor materials. Nothing like the baffles/material used in cars. This plastic is black, and appears to be some type of ABS(?) Quite thin, and obviously not very flexible nor stout. Does anyone know of any plastic repair methods that would bond both the plastic and the metal studs together, and be impervious to fuel? I was thinking JB weld of course, but not sure how it sticks to plastic..was thinking of roughing the remaining plastic up, then just filling the 1/2" holes with JB Weld, thus locking the baffle back in place on the studs as well as the floor of the tank. Any other ideas for plastic repair? BTW, using the TBI pump to evacuate the tank, about 1.5 to 3 gallons of fuel were left in the bottom, when the pump went dry.