Yes, I know I've posted up questions about this before, but I can't seem to find my original thread about EEC gas tank system and how my gas tank collapsed because it wasn't hooked up correctly.

Anyways... I'm about to buy and install a new gas tank on my truck. I don't want it to collapse, so I need some help.

I originally had a non-evapouration emissions control system, but I wouldn't mind having one now because I can get it hooked up no problems.

What's involved with the EEC system, and how is it hooked up?

I've got the charcoal canister at the front of the engine bay on the passenger side of the truck. It's currently hooked up to the carburetor and not the gas tank, like it's supposed to be (because my old gas tank never had EEC).

Anyone help me on this?

I want to get this crap all sorted out during May-long because my truck needs to be moved ASAP.

 

Maybe I should just make this easier on myself and buy a vented gas-cap and be done with it??

What's the difference between the two systems again? And which is more efficient??!

 

As far as efficiency goes I'd say there's no difference between the two systems. It's all about emissions, nothing else.
If you have the charcoal canister and it's hooked to the air cleaner housing then your almost there.
There should be a steel line (5/16" dia.) that runs down the inside of the passenger side frame rail from the canister to the fuel tank. At the top of the fuel tank there is a check valve that goes in the hole on the top of the tank. The steel line is attatched to the check valve via a short rubber hose.
The other difference in the tank is the nipple for the vent hose thats next to the filler pipe is 180 degrees around. And a non-vented fuel cap.
Here's an illustration from the Ford parts catalog.
Click on the .pdf link to view.

 

Thanks for the illustration there mike. Very helpful. I was hoping someone would eventually come around.

Although I got what I wanted, I have, of course, more questions. Bare with me haha.

I've got the system shown in the picture, minus the entire EEC system... I don't have the steel line on the passenger side, nor do I have the item labelled "9D653".

So, I've got the canister up at the top of the engine bay, but I don't have 9D653... The canister is hooked up (looks like a black coffee can with a single line out of it to the carb), but I've got no idea what it does.

Would this mean that I've got half the system hooked up?

Also, I'd like to ask how to tell the difference between a sealed cap and a not sealed cap?

If I stick with the NON-EEC system, I need to have a cap that's able to breathe, right?

 

If the "black cofffee can" youre referring to is mounted horizontally and is about the size of a large juice can, it is not the EEC canister, it is a vacuum reservoir.

 

Ford basic p/n 19A566 = Steel vacuum reservoir aka coffee can. Do you see one a them in the Mike's parts catalog pic? Nope, and neither do I.

Ford basic p/n 9D653 = Charcoal cannister, but there are two different types as it depends on the applications. One type is round, could be steel or plastic.

The other type is rectangular, made of plastic. There are different types of these round/rectangular cannisters, as it depends on...if the truck has a single fuel tank, or dual fuel tanks.
The Evaporative Emission System is abbreviated ev/em .. there is no three letter designation for it. Be thankful that EEC has nothing to do with ev/em!

EEC = Electronic Engine Control (Monitoring System), uses an onboard computer. First vehicles to have it: 1979 LTD/Mercury Grand Marquis 351W sold new in CA, then used in 1980's and thru today vehicles, CA or not.

Ev/em requires unleaded fuel and a non vented fuel cap. The cap has 4 notches (not the 2 used w/a vented cap). The fuel filler neck with ev/em is different, not only for the 4 notched cap, but...has a restrictor.

Gas station pump nozzles were thinner with unleaded fuel, so the leaded fuel pump nozzle would not fit into a filler pipe w/a restrictor.

Back in the day, peeps knocked out the restrictor, then installed a vented cap so they could use leaded fuel. The problem was, leaded fuel melts the charcoal used in the cannister and cat converters.

It wasn't too long before their vehicles sounded like vacuum cleaners headin' on down the road, because the melted charcoal found its way into the muffler.

The melted charcoal gummed up the cannister and could be found in the air cleaner, which really made a mess of things.

 

Thanks for the corrections guys. This will help a lot, as I DO NOT have what I was calling an EEC system, but should having been calling "Evapouration Emission system".

So since I do not have that system, this makes my purchase of a fuel tank that much more simple!

Thanks for the correction on the vacuum reservoir as well. You have to admit, the description the "charcoal canister" is given seems a lot like what someone could call the vacuum reservoir because of its colour and shape.

And as well, a "vented" gas cap should have just "two" steel tabs under the gas cap, and the "non-vented" has "four" steel clips under the gas cap. Is this the correct designation between the two styles?

If I have the non-EV/EM system, then I MUST have a vented cap.

Corrections on both of these statements would be greatly appreciated.

Lets see if I can go 4 for 4 with being corrected! Lol!