Greetings from across the river. Duel rear exhaust? I noticed on my passenger side the tube up over the rear is close-ish to the fuel line. Might shield that too. What about the pick up sock? You also mention regulator at 6psi but no fuel, did you temporarily remove the regulator and see if that helped? Lastly needle and seat, I can't see where they fail closed but its worth the look.
