My buddy as a 4 banger toy efi motor that is "sucking" coolant in through the intake. I have a carb 4 banger so I can only explain as he tells it too me. He says there is a main vacume line that goes from some vacume pump down near the block up to the intake manifold and it is pouring coolant into the intake and filling up the cylinders. Does anyone know what the problem is? He says there is a coolant line that attaches at some vacume pump down at the block where the same main vacume line that goes to the efi intake is also plumbed in at. The vacume hoses are all full of coolant. There is no oil in the water and no water in the oil so I rule out head gasket or cracked head. It fills the cylinders up really quick so something is afoul. Any help or suggestions welcome.