Rear Tank Swap for OBS Ford
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3rd Gear
Joined: May 2026
Posts: 3
Likes: 3
Rear Tank Swap for OBS Ford
Fuel tank and pump setup for 38 gallon rear tank swap in an OBS Ford
Precision A47135 pump w. fuel sending unit
$170ish
Precision fuel tanks FT456 tank
$280ish
Use that part number so you don’t have to extend the fuel pickup lines like you used to with this swap. The precision tank is the same exact tank as the spectra f26e but it’s easier to find. You can get all of this at O’reillys auto parts.
Cut out the tank hole for the fuel sending unit’s tabs, then bend the unit’s pickup tubes until it comfortably fits in the tank, do the same with the float arm until it’ll read empty at rest and full when it’s fully extended. Then I’d recommend replacing the tank vent valve’s seal too.
After that wire the new pump plug in as follows:
Factory red to aftermarket gray
Factory black to aftermarket black/white
Factory blue/yellow to aftermarket purple
Factory orange to aftermarket black
Put the other tank stuff back together (like the filler neck etc.) and then use the hardware that came with the tank to extend the existing bottom straps or to extend the replaced bottom straps.
You should be done after that. Good luck 👍🏻
Precision A47135 pump w. fuel sending unit
$170ish
Precision fuel tanks FT456 tank
$280ish
Use that part number so you don’t have to extend the fuel pickup lines like you used to with this swap. The precision tank is the same exact tank as the spectra f26e but it’s easier to find. You can get all of this at O’reillys auto parts.
Cut out the tank hole for the fuel sending unit’s tabs, then bend the unit’s pickup tubes until it comfortably fits in the tank, do the same with the float arm until it’ll read empty at rest and full when it’s fully extended. Then I’d recommend replacing the tank vent valve’s seal too.
After that wire the new pump plug in as follows:
Factory red to aftermarket gray
Factory black to aftermarket black/white
Factory blue/yellow to aftermarket purple
Factory orange to aftermarket black
Put the other tank stuff back together (like the filler neck etc.) and then use the hardware that came with the tank to extend the existing bottom straps or to extend the replaced bottom straps.
You should be done after that. Good luck 👍🏻
Fleet Mechanic
Joined: Oct 2025
Posts: 1,834
Likes: 399
It would be pretty close if not. Pump assembly is 17.1” long and tank is 13.75” deep. It goes in at an angle, but also isn’t mounted all the way to the top.
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3rd Gear
Joined: May 2026
Posts: 3
Likes: 3
I fit the pump in the tank yesterday and the strainer lands right in the bottom square in the bottom of the tank which is the lowest part so yes it is long enough. It has about 1/4-1/2” of clearance from the bottom which is perfect in my opinion.
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3rd Gear
Joined: May 2026
Posts: 3
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If that wiring blurb on my original post doesn’t have the same color wires as the factory ones in your truck, this is another one that works on the older wiring harnesses like my 1992. The color matching that I originally wrote down was from a 1995 F150.Factory black/white to aftermarket gray
Factory black to aftermarket black/white
Factory blue/yellow to aftermarket purple
Factory orange to aftermarket black
Factory black to aftermarket black/white
Factory blue/yellow to aftermarket purple
Factory orange to aftermarket black
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Lead Driver
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From: North Texas
My 2001 Screw has a 24gal tank, so I can deal with lesser capacity that is for good around town. Cannot recall how much the 7.3 holds combined.
Good wiring pinouts OP, those seem different with each brand of pump and sender!
Good wiring pinouts OP, those seem different with each brand of pump and sender!
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Stangrcr1
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