djlangford

Where does this connect to? It is a '74 Quadrajet, and from the numbers, looks to be from a '73 manual, or at least manufactured in '73. Mine is a '74 BB Automatic. Number on carb is 7044505 BP 3073.


And, a close-up.


Thanks,
David

trw

My distributor vacuum advance is hooked up to it.

Terry

djlangford

Mine was hooked up on top left (passenger side), I moved it to this point, and it seems to run much better. Now, wonder what goes top left? :confused:

I've got 7 vaccum connections, and only 6 vaccum hoses, I took a photo before I took the carb off, but now, of course, I can't find it!

Now, I have the vaccum advance on the side, the top left is empty, the left middle is the vacum valve for the choke (? the canister on the carb), bottom left is the EGR (through an F connection on the thermostat housing), center is the PCV, top right is the Air Canister (below the master cylender), bottom right is the Smog Pump.

I haven't been able to find a good reference, none of my manuals go into the vaccum connections too deeply.

Any advice/references are appricated.

I tried searching the archives for "quadrajet vaccum", and came up with nothing.

Can someone help?

Thanks!
David

trw

O.K. ours should be very similar. Drivers side is Left. Passenger side is Right

Top Right - mine is a "T" with one hose to the choke and the other to the smog pump. My pump is upper right

Right Bottom - goes to straight to EGR - I have no connections on my thermo housing

Middle Bottom - To PCV valve

Left Bottom - To charcoal cannister

Right Side - To distributor

Back to Brake booster.

That's my seven vacuum hose connections

Terry

PRNDL

So is mine! That one has vacuum at idle (what do you call that?). The recommended port for the vacuum advance is up front, but it all depends on whether or not you want vacuum advance at idle. You don't have to use it for anything, in which case you should put a cap on it. :) MJ

clem zahrobsky

that port is used if have a closed style air cleaner to operate the thermo valve that let heat from the exhaust manifold till the engine is up to temp and then switches to outside cold air for more performance. :chevy