Repurposing Mercury Outboard Vapor Separator

[tayto]

https://www.opgi.com/el-camino/L241054/

why not just run an in-tank pump and be done with it? you're system sounds over complicated and unnecessary.

[xcookpac]

Tayto:

After rethinking the vapor separator issues presented (namely, fuel getting hot and also a fire hazard under the hood) I have decided to run solid stainless supply and return lines while using a 1987 Camino TBI tank and sending unit (with a Camaro fuel pump).

Vapor separator unit ("VSU") hookup is actually quite simple: i.) output from the mechanical fuel pump flows to the VSU; ii.) fuel in VSU reservoir is pumped by high pressure pump contained in VSU to fuel rail; iii.) fuel rail return is plumbed to the VSU. VSU eliminates new tank, new fuel lines, new sending unit and new fuel pump in tank. Downside: i.) hot fuel; ii.) extreme vapor pressure due to hot fuel which may not be able to be handled by carbon canister and vent; and iii.) fire hazard under the hood (VSU fuel reservoir could rupture in an accident and cause a huge fire or excess gas fumes could ignite if not effectively handled by carbon canister and vent).

PS I am going to use the vapor separator for when I run the TPI engine on the engine stand.

[1project2many]

You may be worrying more than OEM engineers. 1987 vehicles with EFI did not use special components as you are describing. If needed you could install a fuel cooler on the return line. I have done this with success.