I've upgraded the stock, non return mechanical fuel pump and 5/16 lines to an electric pump with return.
I am using a Mallory 140 pump, Fram HPG-1 canister filter and 1/2" feed and return lines to ensure that the thirsty 462 is properly fed at all RPMs. I've removed the mechanical pump entirely and placed a Moroso big block Chevy block off plate (painted engine blue) in it's place. I am going to likely mount the regulator in the vicinity of the blocking plate, to keep it out of the way. In this picture, it is temporarily mounted on the head. The pump and filter will be mounted on a plate attached to the trunk.
Here are a few pictures of the fuel system install. The pump and filter are mounted on 2x4's, so I can test run everything with the body off. It's a good time to check for leaks. The filter and pump will be mounted on the bottom of the trunk, in front of the fuel tank. I will fabricate brackets for this purpose.
I placed 1/2" steel lines on the frame, which will be connected to the rest of the fuel system with -8AN hose and fittings. I'll use -6AN hose and fittings from the regulator to the distribution block on the forward tripower carb. I am going to keep the stock tripower fuel lines and fittings, unless I have fuel volume problems, in which case I will make up a custom braided setup.
One line runs along the drivers side, and the other on the passenger side.
The longest length of 1/2" steel line that I could find was 10 feet. I really need about 13 feet for each line, so I bought 3 10 footers. I didn't want to use aluminum, for durability reasons, and stainless is just too hard to work with. 2 of the 10 footers are bent and mounted on the frame in the above pictures. The orange hose is for abrasion resistance on the outside of the line where it passes through the frame. The brass fitting is where the over the frame tube connects. Bending fuel line is tough, especially the 1/2" stuff! I ended up buying a Ridgid 1/2" tubing bender for the purpose, and it made the job a LOT easier!
The tools used to cut, bend and flare the hard lines!
Some of the fittings used are brass SAE 45 degree flare, but the rest of the fuel system will mostly be 37 degree AN fittings. I am amazed at how much the AN stuff costs! The average cost of each fitting is around $6! It's the price of doing it right!
In order to take full advantage of the flow capabilities of the pump, I modified a brand new fuel tank sender for 1/2" pickup and return lines. I drilled out the 3/8" pickup tube on the sender, and removed the float assembly from the old tube with the trusty Dremel. I welded the float/sender assembly to the new 1/2" pickup and silver soldered the pickup to the mounting plate. I copied the original to get the correct angle and length of the pickup. I then drilled a hole and silver soldered the return on the other side of the mounting plate. I used silver solder because the mounting plate is stainless steel, and I could not weld it. This assembly will be mounted in a brand new replacement fuel tank I got from a guy on Ebay.
Left is unmodified sender, middle is modified sender, right is new fuel tank.
