38 gallon tank install in a 92-96 (97HD) - Page 4 - Ford Truck Enthusiasts Forums



1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

38 gallon tank install in a 92-96 (97HD)

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  #46  
Old 02-19-2014, 04:46 PM
txnightster txnightster is offline
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And another question; right now I'm suffering the normal issue of the rear tank filling the side tank when switching to the rear tank. I'm going to remove and not replace the side tank.

Can I remove the valve that is malfunctioning as well or would it be best to just switch the "in" hose on the valve from the side tank to the rear and just leave it there?
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  #47  
Old 02-19-2014, 05:04 PM
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I'm not really sure how to go about doing that, my truck had a rear tank only from the factory.
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  #48  
Old 02-19-2014, 07:21 PM
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It is the fdm that is causing the transfer of fuel. The fdm is the part the pump is in and controls which tank gets the return fuel. It's called the fuel delivery module.
Why are you removing the side tank. Is it bad or what. It makes more sense to replace it and have the additional fuel available. And they aren't much money. The fdm is where the investment comes.
But if you must remove it, then cap the hoses off real well, and that's all you need to do.
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  #49  
Old 02-20-2014, 10:54 AM
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In place of the side tank I will be able to install a larger on board air tank. That will come in handy for farm work.

I'm also in the process of rewiring the truck so only having one in tank fuel pump to wire will make things a little more simple.
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  #50  
Old 02-20-2014, 06:55 PM
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Quote:
Originally Posted by txnightster View Post
In place of the side tank I will be able to install a larger on board air tank. That will come in handy for farm work.

I'm also in the process of rewiring the truck so only having one in tank fuel pump to wire will make things a little more simple.
My air tank is inside the quarter panel out of the way.
As far as your rewiring goes, what's wrong with current wiring that you're going to be redoing fuel pump wiring. The switch in the dash does fuel level and pump.
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  #51  
Old 02-21-2014, 09:05 AM
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That's a good idea to hide the air tank in the quarter panel. However, my truck has a flatbed and I have underbody tool boxes so I'm running out of room to hide the air tank.

I'm completely restoring this truck so the wiring has to go. The previous owner cut, rewired, used household wire, etc. to make repairs. That has caused lots of electrical gremlins that make the truck unreliable and frustrating. Rewiring to a single large tank in the rear just makes sense for this application.
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  #52  
Old 02-21-2014, 09:23 AM
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Originally Posted by txnightster View Post
That's a good idea to hide the air tank in the quarter panel. However, my truck has a flatbed and I have underbody tool boxes so I'm running out of room to hide the air tank.

I'm completely restoring this truck so the wiring has to go. The previous owner cut, rewired, used household wire, etc. to make repairs. That has caused lots of electrical gremlins that make the truck unreliable and frustrating. Rewiring to a single large tank in the rear just makes sense for this application.
Out of curiosity, is your truck a cab and chassis, or a pickup that's had a flatbed installed? Reason I ask, is that the frame rails on a cab and chassis truck are spaced differently than a pickup. Cab and chassis are narrower.
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  #53  
Old 02-21-2014, 09:25 AM
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Out of curiosity, is your truck a cab and chassis, or a pickup that's had a flatbed installed? Reason I ask, is that the frame rails on a cab and chassis truck are spaced differently than a pickup. Cab and chassis are narrower.
It is a pickup with a flat bed installed.
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  #54  
Old 02-21-2014, 10:30 AM
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It is a pickup with a flat bed installed.
Awesome. This tank will fit then. Good luck with the wiring nightmare!
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  #55  
Old 02-21-2014, 11:49 AM
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Nightmare doesn't begin to describe it!!

I broke down last night and purchased both Vol A. and B. original shop manuals and the EVTM Manual. Hopefully they will help.

Ordered the tank off Amazon this morning. Hard to beat free shipping for such a large item.
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  #56  
Old 05-18-2014, 09:10 PM
Leftyizme Leftyizme is offline
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Has anyone done this mod on a diesel?
I have a '94 F-350 CC Dually with the dual tanks. My rear tank is the 19 gal. I think.
I'd love to upgrade to a larger tank, and since the diesel does not use an in tank pump, I'm thinking that extending the length of the pickup tube and slight modification to the gauges float rod assembly would be all that's required to make it work.
Just wondering if anyone else had done it and if so, what had to be changed (besides the tank & lower straps).
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  #57  
Old 05-18-2014, 09:32 PM
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Quote:
Originally Posted by Leftyizme View Post
Has anyone done this mod on a diesel?
I have a '94 F-350 CC Dually with the dual tanks. My rear tank is the 19 gal. I think.
I'd love to upgrade to a larger tank, and since the diesel does not use an in tank pump, I'm thinking that extending the length of the pickup tube and slight modification to the gauges float rod assembly would be all that's required to make it work.
Just wondering if anyone else had done it and if so, what had to be changed (besides the tank & lower straps).

I've done this on a couple of trucks. Both 38 gallon tanks I bought came with instructions and hardware to do the swap, so you won't need to buy anything else. I had to extend the float so it had full range of the tank, you'll probably have to play with the adjustment so the fuel gauge will read correctly, other than that it is a straight forward swap.
I think Rockauto has the best pricing on the tank.
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  #58  
Old 05-24-2014, 11:55 PM
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I just bought a used obs U Haul truck for the box. It comes with a single 40 gallon tank in the rear. Going to try to use this tank with my factory dual tank set-up on my f350.
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  #59  
Old 05-25-2014, 11:04 AM
njjr njjr is offline
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I hate stopping for gas, especially on trips. I wonder if it is possible to do this with both tanks? 76 gallons of gas will last a long time. My Motorhome had a 70 gallon tank. I really like that.
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  #60  
Old 05-25-2014, 12:18 PM
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Yeah, but filling them up will make you squeal. At current prices that would be about $280.
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