Name: RPM RZR Pro XP, Pro S, Turbo R 3.8 Gallon Auxiliary Fuel Tank
Brand: RPM SXS
SKU: FTK-PO-15
Price: 769.95 USD
Availability: InStock
Rating: 5.0 (6 reviews)

RPM RZR Pro XP, Pro S, Turbo R 3.8 Gallon Auxiliary Fuel Tank

$769.95 USD

Model Year

20'-24' 2-4 Seat

25'+ 2-4 Seat

Extends ride time by nearly 30% with no chassis modification
3.8 gallon tank fills the factory void behind the passenger seat
Fits 2020-2026 RZR Pro XP 2 seat models

FREE delivery Thu, Nov 19–Mon, Nov 23Or fastest delivery Tue, Nov 17

In stock

Check Fitment

Checking fitment...

Free shipping on this item
Ships by Mon, Nov 16
30-day returns Return policy

[{"id":49027119972423,"title":"20'-24' 2-4 Seat","option1":"20'-24' 2-4 Seat","option2":null,"option3":null,"sku":"FTK-PO-15","requires_shipping":true,"taxable":true,"featured_image":{"id":34776493490247,"product_id":6884874551367,"position":5,"created_at":"2026-10-01T11:23:41-05:00","updated_at":"2026-10-01T11:23:42-05:00","alt":null,"width":3000,"height":3000,"src":"\/\/rpmsxs.com\/cdn\/shop\/files\/TurboBehindTheSeatTankFUllKit_213b294a-47de-4dae-a346-ba940ad4fb53.jpg?v=1790871822","variant_ids":[49027119972423,49027120005191]},"available":true,"name":"RPM RZR Pro XP, Pro S, Turbo R 3.8 Gallon Auxiliary Fuel Tank - 20'-24' 2-4 Seat","public_title":"20'-24' 2-4 Seat","options":["20'-24' 2-4 Seat"],"price":76995,"weight":8165,"compare_at_price":null,"inventory_management":"shopify","barcode":null,"featured_media":{"alt":null,"id":34245533204551,"position":5,"preview_image":{"aspect_ratio":1.0,"height":3000,"width":3000,"src":"\/\/rpmsxs.com\/cdn\/shop\/files\/TurboBehindTheSeatTankFUllKit_213b294a-47de-4dae-a346-ba940ad4fb53.jpg?v=1790871822"}},"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}},{"id":49027120005191,"title":"25'+ 2-4 Seat","option1":"25'+ 2-4 Seat","option2":null,"option3":null,"sku":"FTK-PO-16","requires_shipping":true,"taxable":true,"featured_image":{"id":34776493490247,"product_id":6884874551367,"position":5,"created_at":"2026-10-01T11:23:41-05:00","updated_at":"2026-10-01T11:23:42-05:00","alt":null,"width":3000,"height":3000,"src":"\/\/rpmsxs.com\/cdn\/shop\/files\/TurboBehindTheSeatTankFUllKit_213b294a-47de-4dae-a346-ba940ad4fb53.jpg?v=1790871822","variant_ids":[49027119972423,49027120005191]},"available":true,"name":"RPM RZR Pro XP, Pro S, Turbo R 3.8 Gallon Auxiliary Fuel Tank - 25'+ 2-4 Seat","public_title":"25'+ 2-4 Seat","options":["25'+ 2-4 Seat"],"price":76995,"weight":8165,"compare_at_price":null,"inventory_management":"shopify","barcode":null,"featured_media":{"alt":null,"id":34245533204551,"position":5,"preview_image":{"aspect_ratio":1.0,"height":3000,"width":3000,"src":"\/\/rpmsxs.com\/cdn\/shop\/files\/TurboBehindTheSeatTankFUllKit_213b294a-47de-4dae-a346-ba940ad4fb53.jpg?v=1790871822"}},"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}}]

{"id":49027119972423,"title":"20'-24' 2-4 Seat","option1":"20'-24' 2-4 Seat","option2":null,"option3":null,"sku":"FTK-PO-15","requires_shipping":true,"taxable":true,"featured_image":{"id":34776493490247,"product_id":6884874551367,"position":5,"created_at":"2026-10-01T11:23:41-05:00","updated_at":"2026-10-01T11:23:42-05:00","alt":null,"width":3000,"height":3000,"src":"\/\/rpmsxs.com\/cdn\/shop\/files\/TurboBehindTheSeatTankFUllKit_213b294a-47de-4dae-a346-ba940ad4fb53.jpg?v=1790871822","variant_ids":[49027119972423,49027120005191]},"available":true,"name":"RPM RZR Pro XP, Pro S, Turbo R 3.8 Gallon Auxiliary Fuel Tank - 20'-24' 2-4 Seat","public_title":"20'-24' 2-4 Seat","options":["20'-24' 2-4 Seat"],"price":76995,"weight":8165,"compare_at_price":null,"inventory_management":"shopify","barcode":null,"featured_media":{"alt":null,"id":34245533204551,"position":5,"preview_image":{"aspect_ratio":1.0,"height":3000,"width":3000,"src":"\/\/rpmsxs.com\/cdn\/shop\/files\/TurboBehindTheSeatTankFUllKit_213b294a-47de-4dae-a346-ba940ad4fb53.jpg?v=1790871822"}},"requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}}

RPM RZR Pro XP, Pro S, Turbo R 3.8 Gallon Behind-the-Seat Auxiliary Fuel Tank

Don't let a low fuel gauge cut your ride short. Range anxiety is officially a thing of the past with the all-new RPM SxS Behind-the-Seat Auxiliary Fuel Tank for the Polaris RZR Pro XP, Turbo R, and Pro S!

We know how it goes—you’re miles deep into the trail, the foot is heavy, and the fuel light starts flashing. We designed this 3.8-gallon tank to keep you out of the pits and on the gas longer. Constructed from ultra-durable, rotomolded plastic, this tank is built to take the exact same off-road abuse your Pro XP does. It tucks perfectly behind the seat, maximizing your cab space without getting in the way of your ride.

We hate piecing kits together just as much as you do, so we made sure this one is a 100% complete system. Every tank ships with a dedicated fuel pump, a complete wiring harness, and all the heavy-duty mounting hardware you need. We even bulletproofed the operation: the kit features a momentary dash switch for fuel transfer, meaning you can never accidentally leave the pump running. This completely eliminates the risk of pump cavitation or overheating. No guessing, no burned-up pumps, no extra trips to the parts store—just bolt it in, wire it up, and get back to the dirt.

Key Features

3.8 Gallon Capacity: Significantly extends your riding range.
Roto-Molded Construction: Rugged, impact-resistant plastic built for extreme off-road conditions.
Space-Saving Design: Mounts cleanly and securely right behind the seat.
Fail-Safe Operation: The momentary transfer switch ensures the pump can never be left on, protecting against overheating and cavitation.
Complete Kit: Includes the fuel pump, wiring harness, switch, and all required mounting hardware.
Hassle-Free Install: Everything you need in one box to get you back on the trail faster.

Fitment

2020-2026 Polaris RZR Pro XP (2-Seat)
2020-2026 Polaris RZR Pro XP 4 (4-Seat)
2022-2024 Turbo R 2 and 4 seat
2025-2026 Pro S 2 and 4 seat

All orders typically ship within 2-4 business days of order being placed. Weekends, holidays, and weather may slow fulfillment down on order processing. Unless otherwise noted, backordered items will ship according to their estimated shipping times.

PDF Instructions

Download Instructions PDF

Customer Reviews

Overall rating: 5.0 / 5 from 6 reviews.

Customer photo review of RPM RZR Pro XP 2 Seat 4 Gallon Auxiliary Fuel Tank

My experience from start to finish with RPM SXS was great. After ordering the 4 gallon auxiliary fuel tank for my Razor Pro XP It arrived fast and I noticed it was securely wrapped and boxed up quite nicely. I installed the fuel tank and all of the necessary fittings, what a great product! The fuel pump delivers fuel into the main OEM tank fast. The only thing I would say that possibly could be improved are the installation instructions. I had to read though it a few times to really understand the proper install. It almost seemed like the instructions were written by someone who was too experienced with installing these fuel tanks. Just need to dumb it down a little bit for the less experienced installer, Lol. I really appreciate the added value of having this auxiliary fuel tank with less worries of running out of fuel on those long rides. All in all great product and service from RPMSXS, I highly recommend them!

Michael A. 5/5 Verified November 23, 2025

RPM RZR Pro XP 2 Seat 4 Gallon Auxiliary Fuel Tank

Instructions could have had more details in the photos to show angles and directions of fittings, particularly coming out of the reserve tank and placement of the fitting into the main tank filler hose. I opted to use a ball valve to gravity feed the tank. Works ok as long as the cap is loose. I went this route because our travels will take us over 150 miles between fuel stops, and I didn’t want to chance an electrical issue causing the pump not to work. I really like the use of space and your design for the Rzr xp pro.

Kent “coop” C. 5/5 Verified July 1, 2025

RPM RZR Pro XP 2 Seat 4 Gallon Auxiliary Fuel Tank