73-87 Chevy _ GMC Trucks » Fuel Systems and Drivability ». Fuel line routing « on: March 19, 2011, 10:19:42 PM » I desperately need a routing diagram for fuel lines on a dual tank 79 c20. It has no return lines, and cNe stock with 2 smog canisters and all the smog goodies, california truck... A 73-87 Chevy truck fuel line diagram is a visual representation of the fuel system in a Chevrolet truck from the years 1973 to 1987. It shows the layout and connections of the various fuel lines and components, including the fuel tank, fuel pump, fuel filter, and fuel injectors. This diagram is helpful for understanding the fuel system and.

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Re: Need fuel line diagram for dual tanks. 3/8" Feed line, 5/16" return line, and 1/4" vapor recovery line from LH tank run across the crossmember at the to the RH rail. This is done via hardlines. They go into the switching valve that is mounted inside the RH rail. The RH fuel tank just feeds directly into the switching valve with rubber fuel.. Truck Year. 1987. Truck Model. R1500. Engine Size. 305. The main ones i need to replace are from tank to selector valve, the hard lines are very rusted, seems to be 3 dif sizes, Im thinking 1/4, 5/16, and 3/8. I did find some hose clamps made for fuel injection so plan on using those. Jan 30, 2017.