Fuel System: 1964 Wagonaire and Sedan Gas Caps Why Are They Different?

[bjackameit]

O.K. -- I try to learn something new every day --

Just finished filling the gas tanks and adding Stabil for the winter to my two '64 Studes.

Both the Challenger Wagonaire and the Daytona Sedan have the locking stainless steel type gas caps.

The Wagonaire has a Studebaker AC 3415 cap -- I have the box the cap came in.

The Daytona Sedan has an AC Delco GT49L cap which lists as being correct for a 1964 Studebaker Lark type sedan. I also have the box it came in. I suspect it is the same as Studebaker AC 3195 which is the Studebaker Accessory Number for the sedan locking cap..

Externally these caps look exactly the same and the keys are the exact same type -- I suspect AC Delco supplied the Studebaker accessory caps.

The only obvious visual difference between the two caps is that the "wings" on the inside that hold the cap to the filler pipe are wider on the Wagonaire cap.

Both caps fit fine and seat properly --

I note from my parts book that the standard non-locking Wagonaire and Sedan gas caps also have different part numbers.

So the question is -- why do 1964 Wagonaires and 1964 Sedans use different gas caps? There must be a reason but I don't know what it is --

[Bullet]

I know the Lark type is vented via a tube off the filler neck. I don”t remember if the wagonaire is vented the same way or through the cap. I have two locking gas caps for my 64 cruiser. I have only used the vented one, the second locking cap has stamped inside it, non-venting.

I too am curious.

Mark

[altair]

The 64 sedan would have a non vented cap and is vented via a tube from the filler pipe, it is non vented because of its location, when you accelerate gas would spill out the vent. The Wagoneer has the fuel cap on the side at right angles to the fuel and will not spill out therefore it can be vented.This is a fill neck from a sedan it is very short you can see the vent tube from the side, the tube is the vent tube.

[StudeRich]

It IS important to use the correct Cap, as a Vented Cap on a Sedan will dump fuel, and a non-vented Cap on a Wagon will suck the Tank in and shut the Car down.

All C & K Models and '47 to '61 Sedans also MUST use a Vented Cap.

[bjackameit]

The 64 sedan would have a non vented cap and is vented via a tube from the filler pipe, it is non vented because of its location, when you accelerate gas would spill out the vent. The Wagoneer has the fuel cap on the side at right angles to the fuel and will not spill out therefore it can be vented.[ATTACH=CONFIG]76760[/ATTACH][ATTACH=CONFIG]76761[/ATTACH]This is a fill neck from a sedan it is very short you can see the vent tube from the side, the tube is the vent tube.

Thanks that makes sense.

[bjackameit]

It IS important to use the correct Cap, as a Vented Cap on a Sedan will dump fuel, and a non-vented Cap on a Wagon will suck the Tank in and shut the Car down.

All C & K Models and '47 to '61 Sedans also MUST use a Vented Cap.

The risk of harming the vehicle seems greater with a non-vented cap on a Wagonaire than with a vented cap on a Sedan -- but I would not want to be dumping fuel from a sedan either. With a Sedan would dumping fuel only be a problem if the tank was full or near full? It seems like the aftermarket caps commonly available for these cars are all vented.

[skyway]

Had an interesting situation once with my Wagoneer back in the non-ethanol days.
Mebbe something for you wagon owners to watch for.
Sat out in heavy rain, then ran BAD.
Turned out vertical gas cap had let water leak into tank.
New cap and a couple of cans of Heet, and problem solved.

[ndynis]

Skyway: There was a special part put out later to take care of that problem. I have a copy of the document about it and a couple of the pieces used to do that but I don't have access to them right now. If no one else posts it I will add it later when I can.
Nick

[StudeRich]

Probably a Spacer to make the Gasket fit tighter.

My '76 Volare~ Premiere Wagon had a spacer that belonged behind the Gas Cap BUT, with the Premier Wood Trim, the locking Cap which was part of the "Protection Group" I special ordered on the car, would not even go on enough to Lock.
When I found that hanging LOOSE when it was Delivered New, they removed the spacer. Just one of MANY Quality issues we had with that Wagon before we dumped it.

[jrlemke]

I added a vent pipe to my Hawk when I replaced the tank, very simple and now I don't care if the cap is vented or not!-Jim

[Studebakercenteroforegon]

Skyway: There was a special part put out later to take care of that problem. I have a copy of the document about it and a couple of the pieces used to do that but I don't have access to them right now. If no one else posts it I will add it later when I can.
Nick

See Service Letter F-1964-2, FUEL TANK FILLER NECK WATER DEFLECTOR, 1963-64 STATION WAGON MODELS, dated October 14, 1963
Instructions to install a #1562555 Filler Neck Deflector.
This deflector entered production on 1964 Station Wagons with Serials 64S-4460 and 64V-4685.

[bjackameit]

See Service Letter F-1964-2, FUEL TANK FILLER NECK WATER DEFLECTOR, 1963-64 STATION WAGON MODELS, dated October 14, 1963
Instructions to install a #1562555 Filler Neck Deflector.
This deflector entered production on 1964 Station Wagons with Serials 64S-4460 and 64V-4685.

Well -- My '64 Wagonare is 64S-3122 so I guess I do not have the deflector --

I quick vendor check did't find that part but --

Believe it or not -- checked eBay this morning and there it was for $11 plus $5.50 shipping -- so I bought it -- looks like a giant metal washer with the end cut off --

Now I need to get a copy of the service letter --

[ndynis]

Bill, here is the Service Letter (sorry, the pdf file was too large to send so had to convert it)
:

[skyway]

Live and learn. Even tho my wagon is long gone, thanks guys!

[bjackameit]

Bill, here is the Service Letter (sorry, the pdf file was too large to send so had to convert it)
[ATTACH=CONFIG]76786[/ATTACH]:

Thanks -- got it -- printed out fine --