Simple EVAP and Charcoal Canister For LS swaps (2 Viewers)

[ceylonfj40nut]

All,

Been researching this and have not found a definitive solution. Doing a custom tank and LS swap in a 60 on 80 chassis. Would not prefer to do complex evap system with purge and vent solenoids, pressure sensor etc. Top pic is OEM 60 series. Bottom pic is GM variant. Want to run a vent hard line to engine bay to a carbon can (VC 120). Hesitant to run can directly to the intake or upstream of MAF because it will see constant venting. Thinking of connecting upstream of MAF with either a TEQ BVSV (simple thermal switch) or a electric VSV. Dont want to passively vent carbon can to the engine bay. I plan on using 60 series vapor separator.

Anyone tackled this before?

@dbbowen? @cruisermatt? @thatcabledude? @orangefj45? @DangerNoodle?

 

[dbbowen]

Im adding a square OEM GM charcoal canister to mine back near the fuel tank. The inlet will go to to the in on the canister, the outlet will connect to the existing hard line that goes up the frame to the engine bay. on the other side of that, im going to connect a hose to the oem Purge solenoid on my intake. At least on Gen 3 you cant actually tune that out of the softare, you just disable the MIL Light. Should still purge it like normal.

 

[thatcabledude]

I just have mine venting to atmosphere via a 3/8 fuel hose routed to a high and dry location in the rear fender well (80) at the top of the fuel fill hose. Filter on the end.

 

[cruisermatt]

I run them straight to intake vacuum with a check valve but if you are willing to do the work to add a solenoid I would just use the GM hardware. You already have the provision for it on your intake. It’s not a complicated systen

 

[DangerNoodle]

We always run it fully to GM standards for all the CARB vehicles we do. That usually means a full GM canister for most stuff. Not sure if that helps?

 

[Richfj60]

I run them straight to intake vacuum with a check valve but if you are willing to do the work to add a solenoid I would just use the GM hardware. You already have the provision for it on your intake. It’s not a complicated systen

What canister are you using and where do you put it? I was thinking about running the purge to the air filter canister. would this be a bad idea?

 

[cruisermatt]

What canister are you using and where do you put it? I was thinking about running the purge to the air filter canister. would this be a bad idea?

run the purge to manifold vacuum.
my truck has a VC120 zip tied to the firewall, I had to move it when I put the turbo in and haven't taken the time to make a more legit bracket

 

[Richfj60]

run the purge to manifold vacuum.
my truck has a VC120 zip tied to the firewall, I had to move it when I put the turbo in and haven't taken the time to make a more legit bracket

Thanks Matt. I’m planning on ordering the tank vent hoses, etc for my next project. Chasing a code (P0170) right now, but tank and pump are on the list. Hope you are not in the hurricane’s path. Stay safe!

 

[88Retired62]

Take care Matt as this storm moves across the Sunshine State.

 

[Elbert]

I need to get a better solution going on my setup (5.7 Vortec engine)....I have acquired a "coffee can" version of the charcoal canister. I've been thinking maybe mounting that under the driver side battery. Otherwise my stuff is just vented to atmosphere ...which is not a great solution. OEM evap stuff was trashed when I got my truck. Yea my engine is not an LS...but as noted a 5.7 vortec. I have a hose running from hard line fuel tank vent on the firewall out to the wheel-well, which I don't like and I don't think its good or great or anything....its just that way for now. The stuff on the fuel tank is otherwise stock and the assembly in the passenger side quarter panel is all stock. I do have a in-line electric fuel pump to drive the FI...but thats not a big deal or relational to the solution.