Carb vacuum hookups...problem?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

myersjeremy · 03-11-2006, 11:31 PM

I hooked the charcoal canister up to the main vacuum port on my Edelbrock carb. Once i hooked it up another line coming out of the canister makes an outrageous amount of suction. I checked the routing diagram and the hose that has all the suction is supposed to go to the bottom of the air cleaner. Since I am using an aftermarket air cleaner is there any way of hooking this hose up? If not what should I do with it? I notice an indention in the bottom of the air cleaner that looks as if you could mount a fitting so you could hook the line up. Am I correct? And if so where do I get this fitting?
Thanks for all the help you guys give out!!!!!!!!!

Jeremy

**swervin ervin** · 03-12-2006, 01:33 AM

First, do you have a emissions Edelbrock? It comes with the canister port. I think you have the PCV port hooked to the canister which the reason you have the suction. A canister purge port only vents the vapors to the canister.

As for the air cleaner, yes, most aftermarket air cleaners will have a place you can knock out or built in where you can hook the breather hose coming from the passenger valve cover. The hose doing the suction (3/8" port on carb) goes to the PCV in the drivers side valve cover. The hose on the passenger side valve cover goes to the air cleaner. If you don't have an emissions legal carb that comes with a canister purge vent you won't have any way of hooking up the canister correctly.

Here is a pic of my Edelbrock Qjet. This is the way I used to have it hooked up when I needed to pass emissions (thank goodness that's over with). The hose right under the Edelbrock tag is the one going to the charcoal canister.

SSC's76 · 03-12-2006, 02:27 PM

If it's the Q-jet series it's exactly the same hookups as posted in the pic above. If it's the perfromer series theres only one that is supposed to have all the nessasary vacuum ports and it's the #1400 which Ive never seen in real life so I cant say for sure. All the other like 1405 1406 ect do not have provisions for emmission equiptment so you must by pass the canister or copy an early 70's setup onto it which uses the PCV inline with the canister. I had a good pic of that setup but I cant seem find it.

**RPOZ11** · 03-12-2006, 06:07 PM

Quote:

Originally Posted by SSC's76

If it's the Q-jet .....you must copy an early 70's setup onto it which uses the PCV inline with the canister. I had a good pic of that setup but I cant seem find it.

What year is "myersjeremy"'s truck's application?

For me, I need to ask: Can I run the vapor canister via the PCV route for a 1980 truck and pass emmissions?

I have a 1980 Q-Jet but it doesn't have that port up front under the Edelbrock tag...
Can someone advise the vacuum routing for each port from the carb to part used on the engine?
Is their a place I can find in print this information for my year?
Mine is a 350 in a 1980 Truck...
Thanx!

03-12-2006, 01:33 AM	#2
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	Re: Carb vacuum hookups...problem?? First, do you have a emissions Edelbrock? It comes with the canister port. I think you have the PCV port hooked to the canister which the reason you have the suction. A canister purge port only vents the vapors to the canister. As for the air cleaner, yes, most aftermarket air cleaners will have a place you can knock out or built in where you can hook the breather hose coming from the passenger valve cover. The hose doing the suction (3/8" port on carb) goes to the PCV in the drivers side valve cover. The hose on the passenger side valve cover goes to the air cleaner. If you don't have an emissions legal carb that comes with a canister purge vent you won't have any way of hooking up the canister correctly. Here is a pic of my Edelbrock Qjet. This is the way I used to have it hooked up when I needed to pass emissions (thank goodness that's over with). The hose right under the Edelbrock tag is the one going to the charcoal canister. Attached Images __________________ Mike 1985 Chevy C-10

03-12-2006, 02:27 PM	#3
SSC's76 No No Join Date: Jun 2005 Location: Pueblo Colorado Posts: 1,781	Re: Carb vacuum hookups...problem?? If it's the Q-jet series it's exactly the same hookups as posted in the pic above. If it's the perfromer series theres only one that is supposed to have all the nessasary vacuum ports and it's the #1400 which Ive never seen in real life so I cant say for sure. All the other like 1405 1406 ect do not have provisions for emmission equiptment so you must by pass the canister or copy an early 70's setup onto it which uses the PCV inline with the canister. I had a good pic of that setup but I cant seem find it. __________________ 1976 Custom Deluxe SWB Med FMB.3/4 Drop. Gen VI 454, Muncie HD 3 speed With Modified OE Hurst Shifter, 3.73 12 bolt, GMPP HO roller cam, Hooker headers, Performer intake with modified Q-jet, Accel distributor. Best 1/4 12.3 @108. Funnest run 19.84 @88 full 1/4 mile burn out. 1997 K1500 ext cab 5.7 stock except muffler

03-11-2006, 11:31 PM	#1
myersjeremy Registered User Join Date: Nov 2005 Location: nc Posts: 118	Carb vacuum hookups...problem?? I hooked the charcoal canister up to the main vacuum port on my Edelbrock carb. Once i hooked it up another line coming out of the canister makes an outrageous amount of suction. I checked the routing diagram and the hose that has all the suction is supposed to go to the bottom of the air cleaner. Since I am using an aftermarket air cleaner is there any way of hooking this hose up? If not what should I do with it? I notice an indention in the bottom of the air cleaner that looks as if you could mount a fitting so you could hook the line up. Am I correct? And if so where do I get this fitting? Thanks for all the help you guys give out!!!!!!!!! Jeremy



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