Gas Caps?
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Mountain Pass
Joined: Mar 2016
Posts: 195
Likes: 24
From: 06804 / 38583
Gas Caps?
*Did a search*
I'm sorry fellas, I'm sure this has been beat to death a bunch of times already but I searched and came up empty.
These old locking gas caps of mine are leaking bad enough to want to chuck 'em in the fire pit.
I guess I could get or make up some new gaskets for them, but I'd rather go back to the original style if there's something close.
What are y'all using for gas caps, and where did you find 'em?
And, vented or non-vented?
I'm sorry fellas, I'm sure this has been beat to death a bunch of times already but I searched and came up empty.
These old locking gas caps of mine are leaking bad enough to want to chuck 'em in the fire pit.
I guess I could get or make up some new gaskets for them, but I'd rather go back to the original style if there's something close.
What are y'all using for gas caps, and where did you find 'em?
And, vented or non-vented?
Moderator & parts slinger
Joined: Feb 2007
Posts: 50,247
Likes: 5,815
From: S/W Missouri, Polk county
Vented or none vented depends on YOUR gas tank set up. I grab all the 73-79 gas caps I can when making junk yard laps. I have a pile on my parts shed shelf, so if no luck at the local parts store HELP isle, PM me. Here is some more info from a fellow FTE member.
"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."
"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."
Laughing Gas
Joined: Mar 2015
Posts: 885
Likes: 2
From: Pittsburgh
Like 77&79 said, gonna have to figure out if you have the EEC system or not. Easiest way is to look for the charcoal canister on the passenger frame rail in the engine bay. It'll have hoses running to it and look like a fluid reservoir almost. It'll be wedged under your air inlet from the grill. I have the EEC system, so I have non-vented cap.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 787
From: Simi Valley, CA
No such thing as EEC in any trucks of this vintage. EEC = Electronic Engine Control System aka on board computer.
1979 LTD/Grand Marquis 351W has EEC, nothing else does until the 1980's.
The Evaporative Emission System (Ford: ev/em) is what y'all are referring to. Unleaded fuel, non vented fuel cap.
1979 LTD/Grand Marquis 351W has EEC, nothing else does until the 1980's.
The Evaporative Emission System (Ford: ev/em) is what y'all are referring to. Unleaded fuel, non vented fuel cap.
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Mountain Pass
Joined: Mar 2016
Posts: 195
Likes: 24
From: 06804 / 38583
Thanks for all the info, fellas. It's the '73 that's in my signature.
I guess it'll be one of those projects to look forward to another time, truck is gonna be put up awaiting shipment back to CT from Tennessee in a week or so. Once it gets back there, I'll see if the caps off my old Shovelheads fit. Should, they're just standard old Stant caps.
I guess it'll be one of those projects to look forward to another time, truck is gonna be put up awaiting shipment back to CT from Tennessee in a week or so. Once it gets back there, I'll see if the caps off my old Shovelheads fit. Should, they're just standard old Stant caps.
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