Here's how I did the Walbro 255L fuel pump install on my 1979 C3.
~$100 - I purchased a new 1980-1982 C3 Corvette fuel level sending unit/filler assembly (less fuel pump). It's stainless, which is a nice upgrade from the factory steel (rusted completely out) fuel sending unit that was in my 1979.
~$110 - I purchased a Walbro "kit" for a TPI car (probably intended for a TPI camaro).
~$10 - I purchased some fuel resistant shrink tubing from McMaster
~$220 total invested
The only modification I had to make was to cut and solder the fuel pump plug. The 80-82 pump must use studs because the wires had ring terminals. I cut the studs off and soldered in the Walbro connector.
When I started my project, I originally purchased the Holley drop in unit but when it showed up, I found it didn't have a provision for a return line. I refuse to run a deadhead fuel system as I've always found return style to be more consistent in psi and to eliminate hard starting issues. So that wasn't going to work. Plus, the Holley unit was $370!
My fuel tank and lines were rusted out, so I'm installing a new fuel tank and stainless fuel lines at the same time. I'm using lines from a 80-82 here as well, which will give me a 3/8" feed and 5/16" return. This is the same feed/return sizes which are on my C5 and they have been shown to support 650+ rwhp on a Walbro 255 pump. The regulator is mounted after the Sniper EFI TB in the engine compartment.
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