Factory underbed fuel tank?

[Campbel45]

So I found this on CL today...

http://bloomington.craigslist.org/pts/4289960325.html

[black_sheep454]

I believe that is a dealer add on

[Campbel45]

huh thats first time ive seen one

[truckster]

It's aftermarket or dealer installed. It's not factory.

[CastIron]

My 69 has a tank that looks very similar. It was installed at a RV shop shortly after the original owner purchased the truck.

[DeadheadNM]

Looks an awful lot like the 72-only GM installed tank...here's a truck so outfitted http://67-72chevytrucks.com/vboard/s...d.php?t=363854 as is my K20 linked in my signature below

[Andy4639]

That's like 5 gallon tank! Man it looks very small in the picture may not be but it looks like it to me!

[special-K]

Going by the filler neck,it appears to be a '72-only auxiliary tank. Off the top of my head,I believe they are 8 gallon(?),maybe more like 10

[SS Tim]

The picture is just close-up skewed.
That appears to be the factory RPO NL2 aux. tank, 19 gallon capacity. Optional on 72 CK20 and C30 fleetside pickups
The spacers appear to be the metal bed version. It is missing all the undercab plumbing, selector valve, wiring and gauge selector switch. At least from the pictures provided.
Adding pictures so this thread has some value after the CL ad goes away.

[GASoline71]

My 1972 GMC has the holes in the bed and on the upper front fleetside on both side of the truck from Aux tanks. The holes for the selector switch are still in the floor right below the drivers side of the seat. One of the PO's removed them.

Look at the front of the bedside just behind the stock filler neck in this pic. You'll see the hole where the aux filler neck should come through. There is an identical one on the other side.



Gary

[SS Tim]

Gary, Your truck probably had a pair of in-bed tanks. Most of the aftermarket saddle tanks used side doors (including the GM accessory saddle tanks) or wheel well fillers. The really high through bed fillers are usually only seen with in-bed tanks. But the GM NL2 and earlier N18 aux tanks did use a similar left side only with a vent pipe style filler.

[67swb72klb]

here is a couple pics of mine there is a sheet metal cover inside the bed for the filler tube that I dont have a pic of

[Troy Sr]

That's the same tank my '72 Camper Special had factory installed. Wish I was closer, mine was full of dirt, rust, was rusted through.

[truckster]

Well, I'll be a monkey's uncle. I didn't think the factory installed them.

I guess I learned something new.

[Bob B.]

There was a '72 Sierra Grande in my area with the factory aux. tank. The high mounted filler is a giveaway, there is a metal shroud over the filler pipe in the bed as 67swb72klb states.

[Troy Sr]

Originally Posted by SS Tim

Gary, Your truck probably had a pair of in-bed tanks. Most of the aftermarket saddle tanks used side doors (including the GM accessory saddle tanks) or wheel well fillers. The really high through bed fillers are usually only seen with in-bed tanks. But the GM NL2 and earlier N18 aux tanks did use a similar left side only with a vent pipe style filler.

SS Tim,

Mine had the factory option tank and it also has the filler in the same location, there's a sheet metal cover in the bed that hides the tube going through the bed and up to the filler hole.

[special-K]

Well,I remembered wring again. Could be the funky scrunched pictured threw me off. I'new they were almost something...10 or 20

Factory:

[GASoline71]

Originally Posted by SS Tim

Gary, Your truck probably had a pair of in-bed tanks. Most of the aftermarket saddle tanks used side doors (including the GM accessory saddle tanks) or wheel well fillers. The really high through bed fillers are usually only seen with in-bed tanks. But the GM NL2 and earlier N18 aux tanks did use a similar left side only with a vent pipe style filler.

Thanks Tim! I thought mine did have the in bed tanks. But there are also 2 huge round holes in the front corners of the floor of the bed as well. They are directly under the holes in the bedsides. With more holes where there were carriage bolts in the bed floor as well. From what I figured were the bolts for the brackets that held the tanks underneath the bed.

I can snap some pics of them later on today for you to check out if you'd like.

Gary