I had those thoughts about heat transfer coefficients of various materials while coming up with this design. The heat transfer coefficient of JB Weld is pretty good—I looked online but couldn’t find any hard numbers. I cut the nitrile foam in half so it’s only 1” wide, minimizing its insulation potential. Most of the fuel pump shell is in contact with JB Weld or exposed to fuel. Anecdotally, I don’t know how many fuel pumps actually die from overheating. I was more concerned about the flimsy BMW pre filter not keeping garbage out of the fuel pump. Regardless, I will keep everyone updated, whether the pump lasts three weeks or three decades. [emoji6][emoji106]