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The third tank line runs to the vapor canister. It has nothing to do with EGR. The vapor canister is a passive device that is best left plumbed to the tanks to control noxious fuel odor as well as fuel tank evaporative emissions into the atmosphere.
But...how do you do that in our square bodies with an LS conversion? The LS system has an Evaporative Emissions Purge Valve on the top of the intake, just above the Throttle Body. Then on the Charcoal Canister there is an Evaporative Emissions Vent Valve that allows air into the system. These two valves work in conjunction with a fuel tank pressure sensor. Without the pressure sensor in the tank, how do you make it work? Having the lines connected to the charcoal canister, but then not connected to the engine is almost pointless.
Quote from: ehjorten on May 01, 2017, 01:52:31 PMBut...how do you do that in our square bodies with an LS conversion? The LS system has an Evaporative Emissions Purge Valve on the top of the intake, just above the Throttle Body. Then on the Charcoal Canister there is an Evaporative Emissions Vent Valve that allows air into the system. These two valves work in conjunction with a fuel tank pressure sensor. Without the pressure sensor in the tank, how do you make it work? Having the lines connected to the charcoal canister, but then not connected to the engine is almost pointless. Nonetheless, the tank needs to be vented and evaporative fumes managed.
Quote from: bd on May 01, 2017, 03:08:54 PMQuote from: ehjorten on May 01, 2017, 01:52:31 PMBut...how do you do that in our square bodies with an LS conversion? The LS system has an Evaporative Emissions Purge Valve on the top of the intake, just above the Throttle Body. Then on the Charcoal Canister there is an Evaporative Emissions Vent Valve that allows air into the system. These two valves work in conjunction with a fuel tank pressure sensor. Without the pressure sensor in the tank, how do you make it work? Having the lines connected to the charcoal canister, but then not connected to the engine is almost pointless. Nonetheless, the tank needs to be vented and evaporative fumes managed.Is this purely opinion? Other than a few unpleasant fumes and emissions states there is no reason not to let them vent out into the universe. China lets out more than enough pollutants that a few trucks arent going to destroy the world. Sent from my SAMSUNG-SM-G920A using Tapatalk
The EFI tank switching valve is rated at 60 psi. No need to over-think it. Use good efi rated fuel hose and clamps though.