Help me out with the Can-P thing, not sure what that is.
Stands for "canister purge" and is just what you talk about below, the evap solenoid.
The point is that, unlike early systems that do NOT use vacuum, this one does use full vacuum from the intake. But with the solenoid controlled by the computer, that's not an issue.
EFI Guy wired me for the evap purge solenoid which I am not installing right now.
Great! You're all set then.
You only use full vacuum with the evap system when this control circuit is active.
I don't have an evap vent at the tank right now but have the capability to add one later.
Sounds good. It usually ends up being a good idea.
Especially if you park in the family garage and don't want them complaining about the gas smell.
So I need:
One line capped off and accessible for possible evap system later.
Yes, but if you use vacuum caps, check them regularly after about three months. Or make sure you use some old ones from the factory. Junkyard is a good place to grab a few. The ones you get from the auto parts stores are crap to the worst level you can imagine.
The only thing better than going to the junkyard is the old-school trick of using a short length of fuel hose (the good stuff though) and a screw or bolt siliconed into it.
What is the evap, large or small?
Good question. With the Can-P circuit and solenoid, usually a medium or small one from the canister. Old ones used the large port but attached before the throttle blades. So no full vacuum.
If you're out choosing your charcoal canister, I would opt for one with three sizes of ports. Usually two large ones (will have "mushroom" breather caps), one or two small ones (from the tank) and usually one medium size one. Approx. 5/16 or 3/8 inch fuel line size.
Member 904Bronco here just installed another one on the '67 he's building. Maybe he'll see this and chime in with what size he used.
And one last clarification. From the driver side valve cover hole (Bronco Script covers) gets the hollowed out PCV valve as a 90 and goes to the inlet tube fitting between the MAF and the throttle body. This is the PCV clean return. Think I got it?
Yep. Exactly.
Or close enough at least...
You can use a hollowed out valve to get the full 90 degrees, but the typical part is a 45 degree plastic elbow with a grommet. Depends on what size fitting you use I guess, as to which one is easier, but most of the time they're the larger hose size of the elbow, rather than the smaller 3/8" size hose of a hollowed out valve.
But either can work!
Just as long as it's behind the MAF sensor (so it's part of what has already been metered into the engine) and ahead of the throttle body (so it does not get full vacuum) you're good.
Paul