My '66 F100 has a 30 gal. tank mounted in the bed, just behind the cab. The original tank behind the seats has been removed. This tank has some scale, which can clog the fuel filter if run near dry. Typical problem for old fuel tanks. Here are my options:

1) Remove the bed-mounted tank, have it boiled out, and put it back in. Easy, cheap, and it maintains the higher capacity and range of the 30 gal tank. The only drawback is that it takes up about 10" of bed space.

2) Put in an original cab-mounted tank. I know of one at a nearby junkyard. I don't much like this option. I like having the space behind the seat for storage, and I don't much like having the tank in the cab with me. Also, capacity is only 20 gal. I believe.

3) Do something more creative. I'm very interested to hear if anybody has actual experience with an under-bed tank in a 60's vintage F-series. I have read speculation about installing one, but no first hand accounts. I would think a tank from a SUV might fit. I measured the one on my '86 Isuzu Trooper, and it looks like it would work. There is a lot of room under the bed, and I don't have any problem cutting a hole for the filler neck, if it results in a tidy installation.

Any comments or other ideas appreciated.

 

[font size="1" color="#FF0000"]LAST EDITED ON 01-Feb-01 AT 05:26 AM (EST)[/font][p]If you decide to go with an underbed tank, try [link:www.ridetech.com/|Air Ride Technologies]

They have some really nice looking caps for around $60.

Just a thought.

1988 F-150, SWB, 5.0 EFI (formerly 4.9 EFI), M5OD 5 speed, 3.08 gears, Summit shorty truck headers, Custom built Flowmaster exhaust system. Force 4 LP6000 lightbar, Federal signal PA-300 100 watt siren, Icom IC-V100 50 watt mobile radio.
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1965 F-100 (just purchased 1/18/01), SWB, 390, C-6 auto. Dual exhaust, Not much else to do to it.

Can see both below.

[link:www.geocities.com/hotrodford_88/|Hotrodford_88's Webpage]

 

I heard that some have tried a mustang mounted between the rear of the framerails, but that it does not fit as readily as was expected. If you don't mind "saddle-type tanks" I have seen a conversion done using a tank from a 73-87 style Chevy/GMC, short or long wheelbase, depending on YOUR truck. It mounts outside the 65-66 frame rail, ahead of the rear axle and behind the rear cab mounts. These GM trucks had optional dual tanks, so a tank for either side probably is easily available. The filler neck can be hidden inside the wheel opening, or if you are creative, custom graft the stock chevy fuel filler door into the bed side. Just a thought..Any other ideas, anyone??

 

I found that the gas tank from a Bronco II fits quite well between the frame rails on my 66 f100. It even has the exit out the side, which is different from the mustang tank.

As far as the Cool Cap goes it will not fit between the outer sheet metal and the bed wall. The bronco will still help if you bring it up through the bed in the corner and not right in the middle. I am trying to hide the filler behind the left tail light (Ala 57 Chevy). Do not really want to cut up the body.

 

Thanks for the input.

Can you provide some details on how you actually attach the Bronco II tank to the F100 frame? Also, what did you do for a gage sending unit?

The main drawback of this approach, apart from the obvious difficulties related to figuring out how to make it work and getting the pieces, seems to be the tank size. As far as I can tell, any tank which will fit between the frame rails is going to be 20 gal. or less.

 

One other thought on filler options. It might be interesting to check out marine supply sources. A lot of boats have flush mounted gas fillers in the deck that are designed to take foot and cargo traffic on top of them. There are likely to be many designs to choose from. I was thinking that mounting the filler flush in the bed floor might be the way to go. Cutting a hole in the bed floor would be less invasive than cutting one in the side.

 

I am rebuilding my dash with new gages so I will just let them know what I am using for a sender. The other point that I haven't fully thought through is that my new gas tank has the FI fuel pump in the tank. This might be a good thing. As long as I use a fuel pressure regulator at the other end. Otherwise I will just have the Bronco II port welded in and the sender out of the old 66 tank added.

The Cool Cap requires at least 3" in the back. I am not sure, but would venture to say that a boat is similar. Again this would work in the bed and save the outer body skins. Another option is to nibble out the gas tank door on the bronco donor and use it.

The benefit to the bronco tank is the filler neck is on the side and even if you brought it up through the bed it can be placed off to one side and hopefully still allow cargo room.

 

PS I got the original bronco mounting straps and modeled those for the installation. Piece of cake. I kind of regret not getting the skidplate off the bronco. My truck is a 2wd but it might look a little more dressed out by using it.

 

 

hey I know this is super old, but what kind of bronco tank did you install? Did you have modify it in anyway?

 

Well, this is probably a record, or something. You’re replying to a 23 year old thread, plus, the member you’re questioning has not logged in since 2012, I think. But , stranger things have happened, maybe you’ll get a reply. Good luck.