icanfixall
Official GMM hand model
All the injecters plus the filter and the injection pump return line must flow back to the tank. For the return off the filter just TEE into the return line between 1 & 3 injecter line. Same with the return off the injection pump. It can flow into the return line between number 2 & 4 injecter. Just make sure the return line ends are going to the return line at the back of the drivers side on the head...