Plumbing Your Dual Feed Holley Caburetor
There are many ways to deliver the fuel to your carburetor. On my 350 Chevy I have a Holley 670cfm Street Avenger which happens to use the dual inlet type float bowls. I debated back and forth how I would accomplish this and considered a few options; I could use bulk steel tubing and bend/flare the lines myself, I could plumb it with steel braided AN style hose, or maybe even use rubber hose and push on fittings the entire way. A couple of these options are sounded pretty involved for me. I have worked with steel braided hose before and while that looks really nice it can be painful to work with! The Steel tubing option seemed like the ticket for me, but again can be complex. Bending and flaring the lines sounded like more work than I wanted to do. Lastly, using rubber hose is downright easy, but with today’s fuel I wanted to use as little rubber hose as possible on this fuel system.
A long time ago I remembered seeing a friend’s 1970 Camaro that had a factory LT-1 350 engine, and a factory Holley 4 barrel very similar to the carb that I was using. The car had an interesting dual feed fuel T and dual inlets made from hard tubing. While browsing through some of our new Muscle Car product I discovered a reproduction fuel line just like the one I remembered from years ago!
This was the perfect choice for me! Part number 92618045 is a factory replacement fuel pump-to-carb line kit for 1969-1972 Camaros that have the line coming from the pump all the way to the float bowls. The kit comes with pre-bent/pre flared lines and uses a brass “T” block. This was a great option for me to replace the rubber lines that I had temporarily put together to get the engine running.
One small detail that I encountered is that the factory line set uses smaller 5/16” tubing from the “T” to feed the float bowls. The Holley carb came out of the box with 5/8” thread IFF fittings in the bowls, so I needed to get some smaller ½” IFF fittings to attach the 5/16 tubing to. These are offered by Holley and are available from Speedway under part number 425-2627. This went quick and easy and now I have a fuel line that looks factory, won’t be affected by modern fuels and was a breeze to put together!