Breather Hoses with EFI

[lev16gt]

Apologies for the long post, but I’m buttoning up my EFI conversion and have some breather hose questions. What have people done with the following two hoses after converting to EFI?

The smaller one in the first photo comes up between the firewall and engine and used to go to the port on the bottom of the CIS airbox.

The second photo shows the hose that comes off the front side of the charcoal canister (in the engine bay) and used to go to the left/driver side of the CIS airbox.

Both of these were on the “filter” side of the CIS airbox, before the throttle body. I no longer have that option because I cut down the airbox and removed all the CIS parts for EFI. I would rather not have to put ports/barbs on my air intake tube between the filter and throttle body, but will if needed.

The other end of my charcoal canister has a hose that runs to the left side of the engine cover. If the hose referenced above doesn’t get installed on the air intake tube, what, if anything, do I do with the hose going to the engine cover? And if I eliminate both of those, what happens with the small hose running from the fuel tank to the charcoal canister?

Thoughts?

[rwest]

The first small hose just drained any liquid that might have gotten in the airbox and can just be left or removed.

The hose from the charcoal canister really should be fed into the filter housing to burn off any fumes so they don’t stink up your garage.

You should also have oil breather hoses that you can either feed to the filter housing or to a catch can.

[lev16gt]

Thanks, rwest!

Good to know on the small hose; I guess I could’ve traced its destination. Oops!

That’s what I figured on the hose from the canister. That’s probably the route I’ll go.

For the oil breather hoses, the lower one will remain at the crankcase port on top on the engine. And I was just planning to put a small filter on the upper one, or run the hose to a filter so it runs uphill.

[rwest]

There seems to be two camps on the oil breather hoses, some people like the clean look of hiding a catch can in the corner of the engine compartment and others like to run it to the filter intake.

I have heard that the catch can might leave an oily mist on your engine and other stuff.

I fed mine to the filters to avoid any mist and having to empty a can occasionally.

[phunt]

Doesn’t the oil vent go to the oil tank then to the filter housing? And if you run an oil catch can don’t you run the vent end to the air intake? That is what they air for. So you catch the oil vapor before it goes to get burned. I would still run a catch can but after the oil tank prior to the air intake. I would not just vent the catch can to the engine compartment.