A complete three-piece Sonic 31 replacement fuel tank system featuring a high-durability black Coal Tar Epoxy finish. The set includes the primary 204-gallon center tank and dual 148-gallon port and starboard wing tanks, all custom-fabricated from heavy-duty .190" marine-grade aluminum. The image highlights the tapered hull-conforming geometry and precision-placed 316 stainless steel fittings, engineered for a guaranteed 100% drop-in fit.
Dimensional technical drawing of a Sonic 31 Center replacement fuel tank with a 204-gallon capacity. The graphic shows precise measurements of 112" length, 32" width, and 18" height, featuring a tapered bottom for an exact hull fit. Built from .190" marine-grade aluminum, this OEM replacement includes top-mounted fuel pickups and a sending unit, engineered for a guaranteed 100% drop-in fit.
Dimensional technical drawing of a Sonic 31 Starboard (STBD) replacement fuel tank with a 148-gallon capacity. The diagram provides exact measurements of 104" length, 29" width, and 15" height, featuring the specific tapered geometry required for a starboard-side hull fit. Fabricated from .190" marine-grade aluminum, this OEM replacement includes a pre-installed sending unit and fuel pickups, ensuring a guaranteed 100% drop-in fit.
Dimensional technical drawing of a Sonic 31 Port replacement fuel tank with a 148-gallon capacity. The diagram provides exact measurements of 104" length, 29" width, and 15" height, specifically engineered with the tapered geometry required for a port-side hull fit. Constructed from heavy-duty .190" marine-grade aluminum, this OEM replacement includes top-mounted fuel pickups and an integrated sending unit for a guaranteed 100% drop-in fit.
Front-perspective view of a Sonic 31 Center replacement fuel tank featuring a specialized hull-matching tapered bottom and a protective black Coal Tar Epoxy coating. This 204-gallon tank is constructed from heavy-duty .190" marine-grade aluminum and features precision-welded 316 stainless steel fuel fittings and an integrated sending unit. Engineered as an exact OEM replacement to ensure a guaranteed 100% drop-in fit for offshore marine applications.
Long-profile side view of a Sonic 31 replacement fuel tank featuring a high-durability black Coal Tar Epoxy finish. This heavy-duty marine-grade .190" aluminum tank is precision-welded with top-mounted 316 stainless steel fuel fittings and an integrated sending unit. Engineered as an exact OEM replacement for offshore vessels, it ensures a guaranteed 100% drop-in fit and superior corrosion resistance in saltwater environments.
Side-elevation view of a Sonic 31 replacement fuel tank showcasing its specialized tapered hull-conforming geometry and rugged black Coal Tar Epoxy coating. Built from heavy-duty .190" marine-grade aluminum, this tank features precision 316 stainless steel fuel fittings and an integrated sending unit. Engineered as a direct OEM replacement for offshore vessels to provide a guaranteed 100% drop-in fit and superior corrosion protection.
A long, side-profile view of a Sonic 31 replacement fuel tank finished in a protective black Coal Tar Epoxy coating. This heavy-duty marine-grade .190" aluminum tank is precision-fabricated to OEM specifications, featuring top-mounted fuel fittings and an integrated sending unit. Engineered for high-performance offshore vessels, this tank provides superior corrosion resistance and a guaranteed 100% drop-in fit.
A low-angle perspective view of a Sonic 31 replacement fuel tank highlighting the durable black Coal Tar Epoxy coating. This heavy-duty .190" marine-grade aluminum tank features an exact OEM tapered hull design and precision 316 stainless steel fuel pickups. Engineered for maximum saltwater corrosion resistance, this tank is a guaranteed 100% drop-in replacement for high-performance offshore vessels.
A rear-perspective view of a Sonic 31 replacement fuel tank showcasing its precision-welded construction and textured black Coal Tar Epoxy finish. This heavy-duty marine-grade .190" aluminum tank is engineered with a specialized tapered bottom for an exact hull fit. It features top-mounted fuel pickups and an integrated sender, providing a guaranteed 100% OEM replacement for high-performance offshore fishing and powerboats.
Top-down plan view of a Sonic 31 replacement fuel tank featuring a rugged black Coal Tar Epoxy finish. The image displays the precision placement of the 316 stainless steel fuel pickups, sending unit, and ventilation fittings on the heavy-duty .190" marine-grade aluminum surface. Engineered to exact OEM specifications, this layout ensures a guaranteed 100% drop-in fit and maximum corrosion resistance for offshore marine fuel systems.
Vertical overhead view of a Sonic 31 replacement fuel tank featuring a professional black Coal Tar Epoxy finish. The image displays the precision placement of the fuel sending unit, manufacturing certification label, and dual 316 stainless steel fittings. Built from heavy-duty .190" marine-grade 5052-H32 aluminum, this tank is engineered to exact OEM specifications for a guaranteed 100% drop-in fit and superior corrosion protection in offshore saltwater environments.
Vertical overhead shot of a Sonic 31 replacement fuel tank with a protective black Coal Tar Epoxy finish. The image clearly shows the ABYC/NMMA certification label, the integrated fuel sending unit, and two high-quality 316 stainless steel fuel fittings at the base. Fabricated from .190" marine-grade aluminum, this tank is engineered as a direct OEM replacement to ensure a guaranteed 100% drop-in fit for high-performance offshore vessels.
Close-up photograph of the Welding World Inc. manufacturing tag for a Sonic 31 Center fuel tank replacement. The label specifies a 204-gallon capacity, heavy-duty .190" thickness 5052-H32 aluminum construction, and a 6 psi maximum test pressure. It certifies compliance with ABYC, NMMA, CE, and USCG 33 CFR § 183.510(a) safety standards, ensuring a high-quality, legally compliant OEM replacement for marine gasoline systems.
Close-up of the Welding World Inc. manufacturing label for a Sonic 31 Starboard (STBD) Saddle fuel tank replacement. The certification tag confirms a 148-gallon capacity, heavy-duty .190" thickness 5052-H32 aluminum construction, and rigorous pressure testing at 6 psi. The label certifies full compliance with USCG 33 CFR § 183.510(a), ABYC, NMMA, and CE standards, ensuring a safe and legal OEM-quality replacement for marine gasoline systems.
Close-up of the Welding World Inc. manufacturing label for a Sonic 31 Port Saddle fuel tank replacement. The certification tag confirms a 148-gallon capacity, heavy-duty .190" thickness 5052-H32 aluminum construction, and 6 psi maximum test pressure. The label shows full compliance with USCG 33 CFR § 183.510(a), ABYC, NMMA, and CE standards, ensuring a safe and legal OEM-quality replacement for marine gasoline systems.
A complete three-piece Sonic 31 replacement fuel tank system featuring a high-durability black Coal Tar Epoxy finish. The set includes the primary 204-gallon center tank and dual 148-gallon port and starboard wing tanks, all custom-fabricated from heavy-duty .190" marine-grade aluminum. The image highlights the tapered hull-conforming geometry and precision-placed 316 stainless steel fittings, engineered for a guaranteed 100% drop-in fit.
Dimensional technical drawing of a Sonic 31 Center replacement fuel tank with a 204-gallon capacity. The graphic shows precise measurements of 112" length, 32" width, and 18" height, featuring a tapered bottom for an exact hull fit. Built from .190" marine-grade aluminum, this OEM replacement includes top-mounted fuel pickups and a sending unit, engineered for a guaranteed 100% drop-in fit.
Dimensional technical drawing of a Sonic 31 Starboard (STBD) replacement fuel tank with a 148-gallon capacity. The diagram provides exact measurements of 104" length, 29" width, and 15" height, featuring the specific tapered geometry required for a starboard-side hull fit. Fabricated from .190" marine-grade aluminum, this OEM replacement includes a pre-installed sending unit and fuel pickups, ensuring a guaranteed 100% drop-in fit.
Dimensional technical drawing of a Sonic 31 Port replacement fuel tank with a 148-gallon capacity. The diagram provides exact measurements of 104" length, 29" width, and 15" height, specifically engineered with the tapered geometry required for a port-side hull fit. Constructed from heavy-duty .190" marine-grade aluminum, this OEM replacement includes top-mounted fuel pickups and an integrated sending unit for a guaranteed 100% drop-in fit.
Front-perspective view of a Sonic 31 Center replacement fuel tank featuring a specialized hull-matching tapered bottom and a protective black Coal Tar Epoxy coating. This 204-gallon tank is constructed from heavy-duty .190" marine-grade aluminum and features precision-welded 316 stainless steel fuel fittings and an integrated sending unit. Engineered as an exact OEM replacement to ensure a guaranteed 100% drop-in fit for offshore marine applications.
Long-profile side view of a Sonic 31 replacement fuel tank featuring a high-durability black Coal Tar Epoxy finish. This heavy-duty marine-grade .190" aluminum tank is precision-welded with top-mounted 316 stainless steel fuel fittings and an integrated sending unit. Engineered as an exact OEM replacement for offshore vessels, it ensures a guaranteed 100% drop-in fit and superior corrosion resistance in saltwater environments.
Side-elevation view of a Sonic 31 replacement fuel tank showcasing its specialized tapered hull-conforming geometry and rugged black Coal Tar Epoxy coating. Built from heavy-duty .190" marine-grade aluminum, this tank features precision 316 stainless steel fuel fittings and an integrated sending unit. Engineered as a direct OEM replacement for offshore vessels to provide a guaranteed 100% drop-in fit and superior corrosion protection.
A long, side-profile view of a Sonic 31 replacement fuel tank finished in a protective black Coal Tar Epoxy coating. This heavy-duty marine-grade .190" aluminum tank is precision-fabricated to OEM specifications, featuring top-mounted fuel fittings and an integrated sending unit. Engineered for high-performance offshore vessels, this tank provides superior corrosion resistance and a guaranteed 100% drop-in fit.
A low-angle perspective view of a Sonic 31 replacement fuel tank highlighting the durable black Coal Tar Epoxy coating. This heavy-duty .190" marine-grade aluminum tank features an exact OEM tapered hull design and precision 316 stainless steel fuel pickups. Engineered for maximum saltwater corrosion resistance, this tank is a guaranteed 100% drop-in replacement for high-performance offshore vessels.
A rear-perspective view of a Sonic 31 replacement fuel tank showcasing its precision-welded construction and textured black Coal Tar Epoxy finish. This heavy-duty marine-grade .190" aluminum tank is engineered with a specialized tapered bottom for an exact hull fit. It features top-mounted fuel pickups and an integrated sender, providing a guaranteed 100% OEM replacement for high-performance offshore fishing and powerboats.
Top-down plan view of a Sonic 31 replacement fuel tank featuring a rugged black Coal Tar Epoxy finish. The image displays the precision placement of the 316 stainless steel fuel pickups, sending unit, and ventilation fittings on the heavy-duty .190" marine-grade aluminum surface. Engineered to exact OEM specifications, this layout ensures a guaranteed 100% drop-in fit and maximum corrosion resistance for offshore marine fuel systems.
Vertical overhead view of a Sonic 31 replacement fuel tank featuring a professional black Coal Tar Epoxy finish. The image displays the precision placement of the fuel sending unit, manufacturing certification label, and dual 316 stainless steel fittings. Built from heavy-duty .190" marine-grade 5052-H32 aluminum, this tank is engineered to exact OEM specifications for a guaranteed 100% drop-in fit and superior corrosion protection in offshore saltwater environments.
Vertical overhead shot of a Sonic 31 replacement fuel tank with a protective black Coal Tar Epoxy finish. The image clearly shows the ABYC/NMMA certification label, the integrated fuel sending unit, and two high-quality 316 stainless steel fuel fittings at the base. Fabricated from .190" marine-grade aluminum, this tank is engineered as a direct OEM replacement to ensure a guaranteed 100% drop-in fit for high-performance offshore vessels.
Close-up photograph of the Welding World Inc. manufacturing tag for a Sonic 31 Center fuel tank replacement. The label specifies a 204-gallon capacity, heavy-duty .190" thickness 5052-H32 aluminum construction, and a 6 psi maximum test pressure. It certifies compliance with ABYC, NMMA, CE, and USCG 33 CFR § 183.510(a) safety standards, ensuring a high-quality, legally compliant OEM replacement for marine gasoline systems.
Close-up of the Welding World Inc. manufacturing label for a Sonic 31 Starboard (STBD) Saddle fuel tank replacement. The certification tag confirms a 148-gallon capacity, heavy-duty .190" thickness 5052-H32 aluminum construction, and rigorous pressure testing at 6 psi. The label certifies full compliance with USCG 33 CFR § 183.510(a), ABYC, NMMA, and CE standards, ensuring a safe and legal OEM-quality replacement for marine gasoline systems.
Close-up of the Welding World Inc. manufacturing label for a Sonic 31 Port Saddle fuel tank replacement. The certification tag confirms a 148-gallon capacity, heavy-duty .190" thickness 5052-H32 aluminum construction, and 6 psi maximum test pressure. The label shows full compliance with USCG 33 CFR § 183.510(a), ABYC, NMMA, and CE standards, ensuring a safe and legal OEM-quality replacement for marine gasoline systems.

Sonic 31 Fuel Tank center (204 gal) PORT/STBD (148 gal ea.) | OEM Replacement

$ 7,350.00
/
  • Local pickup available
  • Over-sized & over-weight item.
  • Only Ships LTL Freight.
  • Call us Mon.-Fri. 8:30 a.m. to 4:40 p.m. if in any doubt.

Restore the high-performance range of your offshore vessel with this precision-engineered OEM replacement fuel tank, specifically designed for the Sonic 31. This 204-gallon center tank is reverse-engineered from original factory specifications to guarantee a 100% drop-in fit within your hull's existing stringer configuration. Crafted from heavy-duty .190" marine-grade 5052-H32 aluminum, it offers superior structural integrity and corrosion resistance compared to standard aftermarket alternatives. Whether you are addressing a leak or performing a complete restoration, this tank ensures your Sonic 31 remains USCG compliant and ready for the demands of high-speed offshore environments.

 

  • Guaranteed to Fit Your Sonic
    Every tank is engineered using OEM drawings and/or reverse-engineered from an original unit to ensure a precise, 100% guaranteed fit.  

 

  • Fully Certified Manufacturing
    Our tanks are built by an NMMA-type certified manufacturer and produced in accordance with all ABYC standards.

 

  • USCG Compliant & Pressure Tested
    Each tank meets all USCG requirements and is individually pressure-tested in house. All federal regulations are followed throughout our manufacturing process to ensure maximum safety and reliability.

 

  • .190-Thickness 5052 H32 Aluminum Construction
    Built from premium marine-grade 5052 H32 aluminum at .190 thickness for exceptional strength and long-term durability.

 

  • Complete, Ready-to-Install System
    Each tank comes fully equipped with all required components, including the sender, fittings, and hardware.

 

  • Precision Hand-Welded Construction
    Every tank is hand-crafted using GTAW (TIG) welding, exceeding ASME and AWS D3.7:2004 standards for marine aluminum fabrication.                                                   

 

  • Sherwin-Williams® TarGard® Epoxy Coating
    Finished with Sherwin-Williams® TarGard® Epoxy to provide added protection against corrosion and harsh marine environments, extending the overall life of the tank.

 

  • KUS® (formerly WEMA USA®) Reed-Switch Fuel Level Sender
    Features a high-quality KUS® reed-switch sender with an NBR float, providing accurate and reliable fuel-level measurement.

 

Buy with confidence. Shortly after your payment clears you'll be sent via e-mail a complete set of detailed drawings for you to check all dimensions and fittings positions. If there's any difference from your old tank we can make any reasonable modifications to accommodate your needs. Fabrication of your new tank won't start until you send us your specs confirmation.  

 

IMPORTANT NOTE: The base price is for local pickup in our SW Miami Shop. Check options above for crating and shipping to the contiguous 48 States. All tanks are made to order and the fabrication lead time is 1-2 work weeks. The finished tank pickup window is also 1-2 work weeks, so make sure you will be able to take delivery of your finished tank within that timeframe.     

 

NOTE: Check your tank dimensions thoroughly! Once a tank is manufactured and/or shipped we can't be responsible for mismatches and refunds or returns won't be accepted. All sales are final!

 

Shipping: Only freight to the 48 contiguous states. Contact us for extra-cost shipping options for HI and AK. Orders for international shipping from US-based carriers are welcome but contact us first to coordinate details.

 

Return Policy: No refunds are accepted, as all of our products are made to order. Our policy is strictly limited to the repair or replacement of qualifying defective or damaged goods. Please note that shipping costs are non-refundable. 

 

Fabrication lead time (before shipping): 1-2 work weeks. 

Due to this item's size and weight we can only ship it in an economical way via Less Than Truckload (LTL) consolidated land shipping, and only to the contiguous 48 States.

For shipping inquiries to AK, HI, PR, US-VI, and international shipping, please contact us first at sales@weldingworldinc.com.

All of the destinations above we can only serve as a Free Carrier (or FCA) modality, that requires the customer to contract and pay for their carrier service of choice. We can still ship the item, but only to a warehouse/receiving office within the 48-contiguous States.

In plain terms what this means is that if you want to ship your product to any non-contiguous US territory or internationally, you, the customer, has to provide us with the warehouse address of the carrier that serves your locality with an address within the contiguous 48-US States, as we do not ship overseas on our own.

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