About Tom Joy Expertise Have expertise from 1960 thru 1999 CADILLAC'S in carb, fuel injection, brakes, suspension, CHECK ENGINE lights, ignition, transmission, A/C and heating, Electrical problems and all electronic components. if maxed out you can contact me at: tomcjoy@msn.com.
Expert: Tom Joy Date: 9/4/2007 Subject: 71 Cadillac 500 Fuel Pump Vent/Vapor connection
Question I have installed a 1971 500 cadillac motor in a 1969 chev truck with a vented gas tank. The fuel pump has three connections. In, out, and what i'll call a vent/vapor connection. When the engine is started there is pressurized fuel at this vent/vapor connection. Is this normal, and if so can I plug this connection, or do I need to route it somewhere.
Answer If memory serves, Since your gas tank is VENTED via the gas cap or some other maens you can plug it off.
That is a fuel and vapor return line that goes back to the fuel tank. See if your fuel tank has 2 steel lines coming from it and you can attach this vent/vapor line to this other steel line which is a RETURN line.
