Best Diesel Sump Kit for AirDog and FASS Fuel Systems

#1 · Best Overall

1. AirDog Diesel Sump Kit

• Compatible with Vehicle Type: SUV, Truck

Best for: AirDog universal feed-and-return sump.

Why it ranks #1: It combines feed and return ports, a dual O-ring seal, no-tank-drop installation, and a stated install time under an hour.

AirDog's dual O-ring seal is the key detail of this universal sump, paired with feed and return ports for aftermarket fuel-system plumbing. It installs without dropping the tank, and AirDog says installation takes less than an hour, making it a time-bounded option for addressing quarter-tank suction problems.

The dual O-ring seal is intended to prevent leaks, while the separate suction and return ports support both sides of an aftermarket fuel-system connection. AirDog says the sump uses gravity to draw fuel from the tank and can resolve the common quarter-tank suction problem. Installation does not require dropping the tank and is listed as taking less than an hour, helping owners estimate the work involved. The product is specified for truck and SUV applications.

Skip it if you need stated port dimensions before planning plumbing; this AirDog listing gives no connection sizes.

This suits truck or SUV owners using an aftermarket fuel system who want feed and return ports with no tank drop. Verify that the unspecified port dimensions suit your plumbing before committing to the installation.

Listed on Amazon as: Diesel Fuel Sump Kit by Airdog

#2 · Best FASS Return Setup

2. FASS SK5501 Sump Kit

• dimensions: 7 x 6.5 x 5 in

Best for: FASS single-bolt installation.

Why it ranks #2: Its single-bolt design and 1⁄2-inch NPT suction port simplify the listed setup, while the return port accepts a FASS return line.

FASS's single-bolt design is the defining feature of the SK5501, simplifying sump attachment while lowering fuel suction to the bottom of the tank. The kit installs without dropping the tank and uses one drilled opening, giving FASS system owners a compact installation path for addressing quarter-tank fuel-supply issues.

Lowering the suction point to the tank bottom is intended to resolve the quarter-tank supply issue associated with a higher pickup, while the no-tank-drop approach can reduce the amount of vehicle disassembly needed. FASS describes a single drilled hole and a 1/2-inch NPT suction port, giving installers a clear opening and connection specification. The return-style description also identifies a 1/2-inch NPT return port for routing the FASS return line to the sump.

Skip it if you want to avoid drilling the tank; the SK5501's stated installation method requires one drilled opening.

This is a strong fit for FASS owners addressing low-fuel pickup issues who can drill the tank and use 1/2-inch NPT plumbing. Its single-bolt design may simplify attachment, but the required opening remains an installation consideration.

Listed on Amazon as: FASS Diesel Fuel Tank Sump Kit SK5501 by FASS

#3 · Best Multi-Function Option

3. Beans Diesel Dual-Port Sump

• Material: Aluminum, Metal, Plastic, Stainless Steel
• Compatible with Vehicle Type: Truck
• dimensions: 7.5 x 10.5 x 3 in

Best for: Universal dual-port sump option.

Why it ranks #3: Its dual-port universal design is listed for FASS, AirDog, and Fuelab, with compatibility stated for Cummins, Duramax, and Powerstroke.

Beans Diesel identifies this 280003 as a multi-function dual-port universal sump for FASS, AirDog, and Fuelab systems. Its listed truck compatibility covers Cummins, Duramax, and Powerstroke applications, giving owners of those platforms a branded option to consider when planning a compatible fuel-system installation.

The title's dual-port and multi-function description signals a sump intended to serve more than one connection role, while the stated compatibility with FASS, AirDog, and Fuelab helps narrow the pump-system match. Cummins, Duramax, and Powerstroke are also named, making the intended truck applications clear. The listed dimensions are 7.5 by 10.5 by 3 inches, a useful planning reference for checking installation space. Material specifications list aluminum, metal, plastic, and stainless steel.

Skip it if you need specified port dimensions or a documented installation workflow before choosing a sump kit.

Consider this Beans Diesel sump if its named pump and engine compatibility matches your truck and you want a dual-port option. The listing provides dimensions but not port sizes or installation details, so those specifics may matter to your setup.

Listed on Amazon as: Beans Diesel Multi Function Dual Port Universal Fuel Tank Sump Kit 280003 For FASS/AirDog/Fuelab Compatible with Cummins/Duramax/Powerstroke

#4 · Best Hose-Size Choice

4. SMALLFATW Dual-Port Sump

• Material: Aluminum,Brass
• Compatible with Vehicle Type: Truck

Best for: Dual-port hose-size flexibility.

Why it ranks #4: It includes two 1/2-inch and two 5/8-inch hose-ID fittings, and its dual ports can serve a return line or double feed.

Four brass fittings in two hose-ID sizes make this SMALLFATW sump useful when a diesel fuel setup needs either 1/2-inch or 5/8-inch hose connections. Its dual-port arrangement can accommodate a return line or double-feed use, while the CNC-machined billet-aluminum plate and housing provide the core sump structure.

The pair of 1/2-inch hose-ID fittings and pair of 5/8-inch hose-ID fittings let an installer select a connection size that suits the planned plumbing, rather than relying on one hose size. The dual-port layout supports either a return line or double feed, giving the sump more than one fuel-routing role. Compatibility is listed for AirDog, FASS, and similar pumps on Cummins, Duramax, and Powerstroke trucks; the anodized billet-aluminum construction is described as rust-resistant.

Skip it if you want a single, fixed hose configuration without choosing between return-line and double-feed routing.

This fits diesel-truck owners who want dual-port routing options and both common hose-ID fitting sizes in one kit. Confirm which port arrangement and hose size suit your AirDog, FASS, or other listed-compatible pump setup.

Listed on Amazon as: Fuel Tank Sump Kit for Diesel Truck Dual-Port Integrated Return

#5 · Best Included Hole Saw

5. SMMS Integrated-Return Sump

• Material: Aluminum
• Compatible with Vehicle Type: Truck
• dimensions: 11.81 x 7.87 x 1.97 in

Best for: Truck-specific kit with hole saw.

Why it ranks #5: The aluminum dual-port kit includes a 3-inch hole saw and extra brass, with listed fitment for several named truck families.

A 3-inch hole saw and extra brass are included with this SMMS integrated-return, dual-port sump kit, giving installers named drilling and fitting components in the package. Its stated applications include Dodge and Ford diesel trucks, GM Duramax, and FASS or AirDog fuel systems.

The included 3-inch hole saw supports cutting the tank opening, while the integrated-return dual-port design combines feed and return routing in the sump. Extra brass is also listed, providing additional fitting material for the installation. The oxidized aluminum construction is described as rust-proof, and the application list names Dodge 5.9 Cummins, Ram 2500, W350, Ford F250 and F350, GM Duramax, FASS, and AirDog. Those specific applications make checking the truck and pump match important before installation.

Skip it if you have a truck or fuel system outside the named Dodge, Ford, GM, FASS, and AirDog applications.

This suits owners of the specifically named Dodge, Ford, and GM diesel applications using FASS or AirDog who want a hole saw and extra brass included. Its listed fit is not universal, so match your truck and pump to the application list.

Listed on Amazon as: SMMS Fuel Tank Sump Diesel Integrated Return Dual-Port Sump Kit with 3" Hole Saw Extra Brass for Ford F250 F350 for Dodge 5.9 Cummins, Ram, 2500 W350 for FASS Airdog Duramax Powerstroke

#6

6. ZHSYMX Integrated-Return Sump

• Material: Stainless Steel
• Compatible with Vehicle Type: Truck

Best for: Integrated-return diesel truck upgrade.

Why it ranks #6: Its built-in return and included 3-inch hole saw suit an AirDog or FASS installation, though the listing cautions against off-road use.

A built-in fuel return sets this ZHSYMX sump apart, letting return fuel route back to the tank through the sump rather than requiring a separate return point. Its stand pipe separates return fuel from feed, while the no-tank-drop installation and included 3-inch hole saw support a more direct installation workflow.

The built-in return and separating stand pipe give AirDog or FASS fuel-system owners a defined route for returning fuel while keeping feed and return distinct. ZHSYMX says the sump helps address quarter-tank draw issues, and its no-tank-drop installation avoids removing the tank for access. The included 3-inch hole saw supports cutting the required opening; the listing calls for extra care to remove drilling debris. It is specified for Cummins, Duramax, and Powerstroke trucks, but not off-road use or low-clearance vehicles.

Skip it if you need an off-road sump or your truck has ground-clearance concerns; this kit is explicitly not recommended for either situation.

This suits a Cummins, Duramax, or Powerstroke owner adding an AirDog or FASS system who wants an integrated return and no-tank-drop installation. Avoid it for off-road trucks or vehicles with limited ground clearance.

Listed on Amazon as: Fuel Tank Sump kit For Diesel Truck AirDog FASS

#7

7. Danhonwin Integrated-Return Sump

• Material: Aluminum
• Compatible with Vehicle Type: Truck
• dimensions: 5 x 4.8 x 4.72 in

Best for: Integrated-return aluminum truck sump.

Why it ranks #7: The aluminum sump has a built-in return and stand pipe separating return fuel from feed, with compatibility stated for three diesel families.

An integrated return and stand pipe separate return fuel from feed in this Danhonwin sump, giving AirDog or FASS-equipped diesel trucks a combined connection point. The listing also says installation does not require dropping the tank and identifies aluminum construction for the housing.

The built-in return and stand pipe provide distinct paths for return and feed fuel, which can simplify routing compared with planning separate tank connections. Danhonwin lists compatibility with Cummins, Duramax, and Powerstroke trucks equipped with AirDog or FASS pumps, and says the sump addresses quarter-tank pickup issues or a factory draw-straw limitation. No-tank-drop installation can reduce tank-removal work. Its listed dimensions are 5 by 4.8 by 4.72 inches, useful for installation-space planning.

Skip it if you want a hole saw explicitly listed with the kit; the SMMS sump includes a 3-inch hole saw.

This fits Cummins, Duramax, or Powerstroke owners running AirDog or FASS who want an integrated return and no-tank-drop installation. Plan for the tank opening separately, since the listed included components do not specify a hole saw.

Listed on Amazon as: Diesel Fuel Tank Sump Kit with Integrated Return

#8

8. waltyotur Dual-Port Sump

• Material: Aluminum,Brass,Stainless Steel
• Compatible with Vehicle Type: Truck
• dimensions: 5.12 x 5.12 x 1.97 in

Best for: Three-bolt dual-port routing.

Why it ranks #8: Its interchangeable 1/2-inch and 5/8-inch barbs allow a choice of fuel-supply size, and the listing states a two-year warranty.

A three-bolt clamp design distributes pressure around the O-ring, while interchangeable 1/2-inch and 5/8-inch barbs give this waltyotur sump two hose-size choices. Its dual ports and compatibility with AirDog, FASS, Cummins, Duramax, and Powerstroke applications make it a flexible truck fuel-system option.

The three-bolt design is specified to distribute clamping force around the O-ring, which the listing associates with reduced slippage and leaks. Its dual ports and interchangeable barbs let the installer select 1/2-inch or 5/8-inch connections according to fuel-supply requirements. The kit includes an Allen wrench and steel drain plug, providing named installation and drain components. Aluminum, brass, and stainless steel are listed materials, and the product is presented as a replacement sump for the named pump and engine families.

Skip it if you prefer a single-bolt attachment; the FASS SK5501 lists a single-bolt design for its sump installation.

Choose this for a listed diesel truck when dual ports, two barb sizes, and the three-bolt O-ring clamping arrangement suit your installation. Its fastening method is a specific fit consideration if you prefer a simpler single-bolt design.

Listed on Amazon as: waltyotur Diesel Fuel Tank Dual-Port Gas Integrated Return Sump Kit

#9

9. sixcow Aluminum Sump Kit

• Material: High quality 6061-T6 aluminum
• Compatible with Vehicle Type: Truck

Best for: Sediment-conscious high-flow setup.

Why it ranks #9: The 6061-T6 aluminum kit lists compatibility with high-flow AirDog and FASS pumps and a sediment-collection feature.

A sediment-collection feature distinguishes this sixcow sump, which the listing says reduces sediment flowing toward the fuel filter. Its 6061-T6 aluminum construction and stated suitability for high-flow AirDog, FASS, and Fuelab pumps make it an option for several named diesel engine families.

The sediment-collection feature is intended to reduce the amount of sediment reaching the fuel filter, a practical consideration for owners planning fuel-system maintenance. The 6061-T6 aluminum material identifies the sump's construction, while listed compatibility includes high-flow pumps from AirDog and FASS as well as Cummins, Duramax, and Powerstroke engines. The product description says the sump can use fuel down to the last drop and help prevent air suction when the tank is not full, addressing low-fuel pickup concerns.

Skip it if you need a stated sediment-cleaning interval to plan maintenance; this listing does not provide one.

This suits owners of listed diesel platforms seeking a high-flow-pump sump with sediment collection and low-fuel pickup support. Consider whether the unspecified sediment-service interval fits how you plan to maintain the fuel system.

Listed on Amazon as: Fuel Tank Sump Kit for FASS Airdog Fuelab Pump, Compatible with Cummins Powerstroke Duramax Diesel & Gas

#10

10. ADsunves Diesel Sump Kit

• Material: Stainless Steel
• Compatible with Vehicle Type: Truck
• dimensions: 4.5 x 4.5 x 4 in

Best for: Stainless kit with half-inch fittings.

Why it ranks #10: It lists 1/2-inch inlet and outlet connections, stainless-steel construction, and a hole saw, but provides fewer distinctive configuration details.

Stainless-steel construction paired with two 1/2-inch connections gives the ADsunves sump a straightforward match for diesel fuel-system plumbing. Its listing specifies compatibility with Cummins, Duramax, and Powerstroke engines and says a precision hole saw is included, helping buyers plan both the connection size and tank-opening step.

The 1/2-inch inlet and outlet connections provide a defined plumbing size for a compatible AirDog or FASS setup, while stainless-steel construction identifies the kit's body material. A precision hole saw is included for installation, and the product dimensions are 4.5 by 4.5 by 4 inches, useful when considering available space around the tank. The listing also points to a setup video, offering a visual reference for the installation workflow.

Skip it if you need 5/8-inch hose connections; the SMALLFATW dual-port kit lists 5/8-inch hose-ID fittings as an option.

Choose this for a compatible diesel truck when stainless-steel construction, 1/2-inch connections, and an included hole saw match your fuel-system plan. Check your pump plumbing requirements, since both listed connections are 1/2 inch.

Listed on Amazon as: Fuel Tank Sump Kit for Diesel Truck, for AirDog FASS Fuel Tank Mount Kit