So, when adding enough gas to actually drive around to the truck I have realized the original tank is bad and needs to be replaced...my question is this:

When I go to buy one online it has 2 options..one with an EEC thing and one without...how do I know which one I need since the EEC is actually on top I cannot see that without dropping the tank.

Josh

 

Are you sure it is not just your filler neck or vent tube rubber lines leaking?

Do you have all the emissions stuff on you truck? If so, I bet you have a EEC tank. Look at the cross member/gap area right in front of the tank, do you see any type of small black rubber vent line coming out and going up the passenger side frame rail? If so EEC tank.

ND says" There are two differences between the tanks. Tanks with EEC have a hole in the top center of the tank. A rubber grommet and check valve are pressed into the hole. A line goes from the check valve along the inside of the passenger side frame rail to the engine compartment where it hooks up to a charcoal canister. Non-EEC tanks don't have this hole. The other difference is the nipple for the breather line that is located right next to the nipple for the filler hose is located 180 degrees opposite.
If you are going from an EEC tank to a non-EEC tank you must also change the fuel cap to a vented style. The EEC tanks are vented through the EEC system and use a sealed fuel cap. Non-EEC tanks vent through the fuel filler cap.
If you run a non-EEC tank and a sealed cap the minimum is you'll have fuel starvation problems, at worst a collapsed fuel tank.

Is your truck a long bed 4WD? Does it have evaporative emission system?
There are two possibilities with the plastic tank.
79 F150-350 regular cab, 133" WB 4WD, w/ evap. emissions system, 24.8 gallon mid-ship plastic tank
D7TZ-9002-C
Same w/o evaporative emissions system 26.3 gallon plastic tank
D7TZ-9002-D "


Great time to go with a poly tank. Plastic Gas Tanks for Chevy, GMC, Ford, Jeep, Toyota and IH Scout Vehicles

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There is a walk thru on dropping the aft tank here. https://www.ford-trucks.com/forums/1...then-some.html

 

Thanks for all the info!

While the rubber lines are not great, they are not the issue...when you get under the truck from the rear, you can see a decent amount of saturation covering the back bottom portion of the tank...not enough to drip to the ground, but enough to fill the garage with fumes and gas odors.

I am out of town, but when I get home I will check for the line for the EEC deal....our truck is a '78 F100 short bed.

Thanks again!

 

Hey which page is that tank dropping link on? i couldnt find it

 

Right here https://www.ford-trucks.com/forums/1...l#post14696841

 

LOL

I'm an idiot..I was looking for a blue highlighted link. LOL

 

Clicking on the link at the end of this statement "There is a walk thru on dropping the aft tank here" is how you get to another monster info thread that has the walk thru in there somewhere.

I was being lazy.

 

forango...
Where are you located? I have a pretty nice used original tank.
Eric.