if i ain't mistaken they are factory tanks under the bed if the fuel filler is in the wheel well. or was it if they are between the bed and cab i forget which way it is. but if there is fuel doors on the bed side then they were aftermarket and not factory installed. looks like a nice truck to start with.

 

^ ^ Your fuel filler neck location info is in-correct for Stylesides. There was only one factory auxillary tank available for 1967/72's. ^ ^
Decoded from the 1964/72 Ford Truck Parts Catalog:

F10 = F100 2WD

Y = 360 2V (H = 390 2V). On sale day, 360's magically become 390's!

R = San Jose CA Assembly Plant.

C72156 = 1968, assembled January 1968.

131" Wheelbase.

6 = Pebble Beige.

F100 2WD, 5,000 lbs. GVWR

C 81: C = Medium Beige Crush Vinyl & Medium Beige Leeds Pattern Woven Plastic // 81 = 81B Custom Cab.

G = C6 Cruise-O-Matic.

17 = Ford 9" Rear Axle / 3.25-1 / non Limited Slip / 3,300 lb. Rear Axle Capacity.

5,000 lbs. Gross Vehicle Weight Rating.

172 net HP @ 3,800 RPM

71 = Los Angeles (SoCal) Ford District Sales Office, where the original selling dealer ordered the truck from.
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1967/72's came with the in-cab fuel tank. A 25 gallon auxillary tank was an extra cost factory installed option. NOTE: Only one auxillary tank was available 1967/72. Two were available 1973/79-left side mounted only.

The auxillary fuel tank mounted inside the left frame rail, and on 1967/69's, the fuel filler neck & exposed fuel cap is mounted on the left bedside, in front of the left rear wheel, above the scallop (bumpside) line.

Inside the bed, is a sheet metal cover that protects the fuel neck from possible cargo damage.

I looked at the pics, your truck does not have the factory auxillary tank. The saddle tanks are aftermarket-not genuine Ford. Ford never installed any fuel tank on the right side.

Since the truck was prolly sold new here in SoCal, the Fey Bumper Company most likely installed the tanks, as this was their speciality besides selling step bumpers.

The dealer could have sent the truck out to have the tanks installed. But who knows how long the tanks have been there? The original purchaser, or subsequent owner(s) could have added them.

 

thank you bill for the exact breakdown . i like your" on sales day 360 became 390" lol so true about sales men . here's the pics of the tanks . once i looked at them i relized they are after market maybe even home made .

 

after cleaning i relized the stamped metal was actually the old style label maker stickers ..lol it was filthy

 

photoshopped a semi gloss black onto my truck , i am so doing this !!!