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38 gallon gas tanks

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Old 11-24-2013, 07:42 PM
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38 gallon gas tanks

I've read a bunch and search a bunch, so if the answers are out there, I missed it, read it so long ago I've forgotten, and/or know it and just want to put in it one thread.

In my 1976 F150 Custom I have the 19 gallon gas tank. I want to put in a 38 gallon gas tank. The Spectra from JC Whitney has two categories: Without or With a rollover valve. The LMC 38 gallon has one With Evaporative Emissions Control and one without.

This leaves me with a few questions:

What is a rollover valve?
How do I know if need a tank with or without one?
How do I know if need a tank with or without evaporative emissions control?
Why do the two seemingly similar tanks have two different options?

I want to buy a bigger gas tank. Please help.

Thanks in advance.
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Old 11-24-2013, 08:32 PM
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1. A rollover valve has an internal checkball that stops fuel flow in case ya go turtle.
2. Opt for a rollover valve if it's a 4x4. Your option on a 2WD.
3. Does your rig have a charcoal canister? If yes, then it has EEC.
4. Depends on emissions configuration and planned use.
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Old 11-24-2013, 08:39 PM
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Thank you for the direct answers. It is a 4x4. I'm in florida, so I have no inspections.

where would this "charcoal canister" be located?

thanks
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Old 11-24-2013, 08:50 PM
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Thank you for the direct answers. It is a 4x4. I'm in florida, so I have no inspections.

where would this "charcoal canister" be located?

thanks
Either on the side frame, outboard, basically under the passenger floor pan OR, on the right frame rail, inboard, below the battery.
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Old 11-25-2013, 07:02 AM
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Well HIO Silver is on this one like a hobo on a ham sandwich, but here is my input.

The valve is pushed in by hand on the top of your fuel tank. So you can remove it and reinstall in your new tank.

If you currently have one and plan on reusing it, I'd get a new one so it does not cause possible vapor lock issues if it goes bad.

Going from a valve tank to a none valve tank and not replacing the filler cap with a vented one might cause you some vapor lock type issues also.

You do know you need a different sending unit? Your 19 gal unit will fit, just not read right. Some folks bend the arm...bad idea IMO. Just get a new proper 38 gal sending unit.
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Old 11-25-2013, 07:15 AM
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Also keep in mind the 38 gallon tank came in Broncos from the factory since they couldn't have dual tanks as an option. Broncos came with a skid plate under the tank because that sucker will hang six inches lower than your 19 gallon tank. The Bronco skid plate (also the lower mounting bracket) should be interchangeable from the Bronco.
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Old 11-25-2013, 07:29 AM
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Can you buy new tank brackets
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Old 11-25-2013, 07:36 AM
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You talking lower tank straps themselves or the brackets to mount the Bronco skid plate?
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Old 11-25-2013, 11:53 AM
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check my gallery..... you can use the existing straps.
Also note that the overflow tube is on opposite sides depending on which tank you get (with or without the eec). My guess is that your '76 does not have the rollover valve and eec set up. I picked up the wrong tank because it was a steal. I just plugged the hole and re-routed the overflow. No issues after more than two years.

Frank

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Old 11-25-2013, 08:54 PM
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Yes i was talking about the lower straps,thats cool we can use the old ones
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Old 11-25-2013, 10:58 PM
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That sucker hangs down a mile! Don't plan on off roading if you get one
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Old 11-26-2013, 12:00 AM
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That sucker hangs down a mile! Don't plan on off roading if you get one
Or build a strong frame with at least a 3/16th thick aluminum shield lest it go up in flames like a Tesla.
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Old 11-26-2013, 12:06 AM
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Quote:
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That sucker hangs down a mile! Don't plan on off roading if you get one

...and that's why Ford mounted them with a skid plate instead of straps.
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Old 11-26-2013, 04:42 PM
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Quote:
Originally Posted by earthquake68 View Post
Also keep in mind the 38 gallon tank came in Broncos from the factory since they couldn't have dual tanks as an option. Broncos came with a skid plate under the tank because that sucker will hang six inches lower than your 19 gallon tank. The Bronco skid plate (also the lower mounting bracket) should be interchangeable from the Bronco.

What year(s) Bronco are we talking? Are the skid plates available aftermarket or a jy item?
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Old 11-26-2013, 05:06 PM
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Redneck, What part of the country are you in? I installed one of the 38 gallon tanks in Old Blue when I rebuilt the truck 4+ years ago and to be honest, I'm ready to go back to the stock size tank. Might be up for swapping if you're close enough and your tank, etc is in good shape..... Arcade / Jefferson, GA here.
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