Fuel delivery woes

[matrixx]

Wow thanks for the details. I saw the canister but only one line is going to mine. The original air cleaner is gone. Is there anyway to connect it back up with aftermarket Carb and air cleaner?

 

[Jeff73Mach1]

Any line to the air cleaner housing will suffice. Some of the canisters are much ldeeper (I think for the non AC cars)

 

[matrixx]

Any line to the air cleaner housing will suffice. Some of the canisters are much ldeeper (I think for the non AC cars)

Mine has an after market open style filter with a "used to be chrome" top. No nipples on it to attach anything.

 

[72HCODE]

you could always drill a hole in the air cleaner base and install a hose connection.

basically your tank is venting right now to atmosphere so there is no chance of tank implosion unless the canister gets clogged with fuel varnish. the difference is there is no air pull through the tank to remove moisture and extra vapor. you don't have to really hook it up unless you want to. but if you do you want to, use the largest hose connection on the vapor can and feed that to the air cleaner base. there are some chrome air cleaner bases that have a Huge Elbow connection for a hose. some people think its for the PCV but its suppose to be for the vapor can, the PCV is suppose to go to full manifold vacuum on the intake tree.

 

[matrixx]

you could always drill a hole in the air cleaner base and install a hose connection.

basically your tank is venting right now to atmosphere so there is no chance of tank implosion unless the canister gets clogged with fuel varnish. the difference is there is no air pull through the tank to remove moisture and extra vapor. you don't have to really hook it up unless you want to. but if you do you want to, use the largest hose connection on the vapor can and feed that to the air cleaner base. there are some chrome air cleaner bases that have a Huge Elbow connection for a hose. some people think its for the PCV but its suppose to be for the vapor can, the PCV is suppose to go to full manifold vacuum on the intake tree.

Thanks for the info. I'm going to take some pics of my vacuum lines. Im sure PO has them all screwed up. There's a big block on the back of the manifold with some rubbur hose attached with a bolt in the other end? The vacuum advance is connected to the front tree. Not to get off topic but I think some shade tree rigging is going on.

 

[72HCODE]

the rear T would be used for the Transmission Modulator. if you have an automatic. The brake booster if you have power brakes. The climate control system if you have A/C or powered heater. The PCV usually feeds into the front tree but it doesn't matter. A 73 would have a vacuum tree distribution block attached to the firewall and run to the intake manifold. other things would be if you have a Spark delay adjuster that is vacuum controlled or a cruise control. for a basic pre nightmare emissions car your looking at 3 major things off the rear tree

and about 2 things off the front tree.

for an A/C car your would have have a Distributor Vacuum Control Valve which attaches to the water pump housing and compensates for a car overheating by switching from ported vacuum at idle to Full manifold vacuum at idle. this is actually pretty cool. if the car started to overheat in traffic your ported vac switches to full manifold vac which advances the vacuum advance and causes the Idle RPMs to increase about 100 rpms which in turn makes the fan go faster and cools the motor back down. when temps drop the Distributor Vacuum Control Valve switches back to ported and lowers the RPMS back down.

some of the vacuum devices on the motors are pretty cool and have a purpose. a lot of people ripped everything off motors back in the day and made the cars run terrible at idle or for street driving.

other things that needed vacuum were for the original air cleaner base for the heat riser which helped the engine warm up faster, and if the air cleaner had a AUX air port or power port, it was a flapper that would open when you punched it to let a sudden increase of air down the intake, the idea was for emissions at idle where the engine would be rich at idle which knocks down some exhaust emissions from the tail when in traffic. I think it makes the car a little more punchy off the line for a street car.

the last vac accessory would be if you had the RAM Air intake for the hood which used 2 flappers under the hood to open and close the NASA air scoops when you stomped on it.

 

[matrixx]

the rear T would be used for the Transmission Modulator. if you have an automatic. The brake booster if you have power brakes. The climate control system if you have A/C or powered heater. The PCV usually feeds into the front tree but it doesn't matter. A 73 would have a vacuum tree distribution block attached to the firewall and run to the intake manifold. other things would be if you have a Spark delay adjuster that is vacuum controlled or a cruise control. for a basic pre nightmare emissions car your looking at 3 major things off the rear tree

and about 2 things off the front tree.

for an A/C car your would have have a Distributor Vacuum Control Valve which attaches to the water pump housing and compensates for a car overheating by switching from ported vacuum at idle to Full manifold vacuum at idle. this is actually pretty cool. if the car started to overheat in traffic your ported vac switches to full manifold vac which advances the vacuum advance and causes the Idle RPMs to increase about 100 rpms which in turn makes the fan go faster and cools the motor back down. when temps drop the Distributor Vacuum Control Valve switches back to ported and lowers the RPMS back down.

some of the vacuum devices on the motors are pretty cool and have a purpose. a lot of people ripped everything off motors back in the day and made the cars run terrible at idle or for street driving.

other things that needed vacuum were for the original air cleaner base for the heat riser which helped the engine warm up faster, and if the air cleaner had a AUX air port or power port, it was a flapper that would open when you punched it to let a sudden increase of air down the intake, the idea was for emissions at idle where the engine would be rich at idle which knocks down some exhaust emissions from the tail when in traffic. I think it makes the car a little more punchy off the line for a street car.

the last vac accessory would be if you had the RAM Air intake for the hood which used 2 flappers under the hood to open and close the NASA air scoops when you stomped on it.

I appreciate all your knowledge. I don't have AC or power brakes nor do I have an automatic. No cruise control either. The engine is a late 70s early 80s I'm guessing. The stock intake has been replaced with a 65 289 4barrel intake. I don't recall seeing a tree on the firewall. I know there is a front tree that the distributor is connected to that seems tied into the thermostat housing.