Have you tried running another pickup into the tank further to the rear?? CAn be done by welding another bung into the tank, then using a 'y' before the pump to reduce back to a single line. If you are going to weld the bung--FLUSH THE TANK AND THAN FILL IT WITH WATER BEFORE WELDING!!!!! Obviously--let it dry COMPLETELY before reinstallation. We wouldn't want a fellow member blown to KABOOM Afghanistan!