flow guide valve, crank case vent, weber carb

[haze]

apparently i suck at posting pictures on the interwebs this will be my second attempt:

this is for an L16 engine in a 72 521 pickup

i am trying to hook up the flowguide valve/anti back fire thingy

 

http://i166.photobuc...30/IMG_0774.jpg

how do i hose this thing out? all i have left on my intake manifold/carb is a spare vacuum line (i assume the weber came with its own vacuum line and thats what i tied my dizzy to). the way that i understand it the bottom input of the flow guid valve is supposed to connect to the crank case vent like so:

 

http://i166.photobuc...30/IMG_0781.jpg

 

but where do i connect the other line of the valve to? the air cleaner on the weber only has one input line for what i understand to be for the snorkel vent on top of the engine. should i run a T into this line when i install the air cleaner? can i attach the thing to that secondary vacume line like so-ish?

 

http://i166.photobuc...30/IMG_0782.jpg

 

what would happen if i just bi passed that damn valve? would i be in engine backfire hell?

[haze]

seriously, what happened to all the genius datsun nutters out there?

i posted pictures you guys love pictures

[banzai510(hainz)]

image 781 is correct.

 

I dont run the top one myself its not needed.

 

plug the LITTLE HOLE that points to the fire wall. Not needed

 

You need the crank case tube to the lower intake to the PCV valve hose. 11828-23002 nissanparts.cc enter in the upper black and should come up. or go to local dealer

[banzai510(hainz)]

if truck is back fdireing try retimming it. Get the hose

[420n620]

in image 0774, the part on the fender well, the top fitting hoses goes to the air cleaner, the bottom fitting ~ image 0781, hainz is correct and for the fitting on the intake manifold, I just plugged it off since it goes to an air control valve for the emissions.

[DanielC]

A little background. This three port valve is for the evaporative emissions system only. On the 521 truck, you also have a vapor separator tank, in the bed of the truck just ahead of the left wheel well. The truck used the engine crankcase to capture gas tank vapors.

Here is a picture of the vapor separator tank.

There are two ports on the bottom of this tank. The port without the dimple goes to the middle port on the flow guide valve. The top port goes to the bottom of the air cleaner, the bottom port goes an extra small pipe on the side of the large pipe coming from the crankcase for the PCV system.

 

This is how the system works.

When the truck is running, fuel drawn from the gas tank creates a slight vacuum in the gas tank. The flow guide valve allows filtered air from the air cleaner into the vapor separator tank, and that in turn allows air into the gas tank.

When the truck is parked in the hot sun, gas vapors are blocked from going back into the air cleaner, and in turn are pushed throught the flow guide valve, into the engine crankcase, and stored there.

The next time the truck is started, the PCV system draws the gas vapors out of the engine crankcase.

[ggzilla]

The Flow Guide Valve is more than emissions control. It is the fuel tank venting valve. The fuel tank needs to be vented.

[haze]

shucks fellas i knew you wouldnt let me down, danielc thanx for the tutorial on the flow guide valve i saw the diagrams in my books and i gathered its purpose but i didnt understand how it worked so you made me less of an idiot, found these to connect those lines to the filter box of my webber

valve cover and filter vent tubes a lil ways down the page:

http://www.knfilters.com/filteraccess.htm

 

should work great to tie all my breather stuff to my filter box, thanx again y'all!!!!