Any clever ideas on charcoal canister / fuel vent for EFI conversion?

[tdskip]

Hi - hope everyone is having a good week. Is there any conventional wisdom on the best vent capture approach on the fuel vent on an EFI conversion? Any specific check valve that people like or off-the-shelf charcoal canister to absorb the fumes?

 

Thanks!

 

[Stoffregen Motorsports]

I like to use the canister that came with the engine. What motor is it? What did it come out of?

[tdskip]

Good morning, thanks for the note. This is a S14 JDM car, so the original set up is not available to me. It is going into a late 60's car so I need to create my set up (specifically a Triumph TR4a, very similar to a Roadster).

 

Thanks!

[datzenmike]

The canister only 'absorbs' fumes vented from the fuel tank I think. Does the TR4 even have a vented tank?

 

Usually there may be a vent line from the carb but this engine won't have that.

 

 

I'm not sure if there is a reason to have one, but if there is a tank vent line, any canister from any make of vehicle will work if it has...

 

A purge line.... just a vacuum line from the intake to signal the engine is running and to open the canister to empty it

A vacuum line from near the throttle so the fumes are thoroughly mixed with the incoming air

A tank vent connection.

 

 

This sould be enough.

[tdskip]

Thanks Mike. The TR4a did not, but TR6 did. Not uncommon for an earlier car to fumigate the garage which I am looking to avoid and make sure the tank flows fuel properly.

[DanielC]

Copy the TR6 system.  Use parts from a junk yard.

Copy some other mid 1970's car.   They are pretty simple.  Go to a much later car, and you could run into a lot of sensors, and make the system a lot more complicated.

The system used on a Datsun 521 just consisted of a tank above the gas tank, that separated fuel vapors from the liquid.  The liquid drained back into the gas tank.  There is a valve in the engine compartment, that allows air from the air cleaner to get into the tank, but any pressure in the tank is vented into the engine crankcase.  When the engine is running, the PCV system purges the engine crankcase.  A Datsun 521 with evaporative emission control does not have a charcoal cannister.

[Stoffregen Motorsports]

My '57 Land Rover with Toyota 22RE has the fuel vent line teed into the PCV system. There is a check valve, but it does not work flawlessly. On steep inclines with a full tank, it tends to flood over into the intake and sputter. I could use some sort of vapor canister in between.

 

For a street driven car, that doesn't see heavy offroad use, this setup would work fine.

[tdskip]

Thanks guys, appreciate the coaching!

[hosestop@msn.com]

G20 at Junk yard in trunk.

[bob3d]

I cut the bottom off with a hacksaw . Refilled with activated charcoal from wallmart and glued bottom back on. By the way the round cap on top has a diaphragm. The cap will pop off . My diaphragm had a small hole, small dab of liquid rubber fixed it.