Best Sump For Fuel Tank: Compare 10 Diesel Sump Kits

#1 · Best Overall

1. FASS Diesel Sump Kit SK5501

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

Best for: Single-bolt FASS return sump.

Why it ranks #1: Its single-bolt design and 1⁄2-inch NPT suction port suit a FASS installation, while the return-style port routes return fuel to the sump.

FASS specifies a unique single-bolt design for the SK5501, making simple installation its central distinction. The sump lowers the fuel suction location to the tank bottom to address quarter-tank supply issues, and its 1/2-inch NPT return port accommodates plumbing the FASS return line to the tank.

The no-tank-drop installation and single-bolt design offer a defined installation approach, while a single hole drilled in the tank is specified for the return-style kit. Lowering the suction point to the bottom is linked to eliminating quarter-tank fuel supply issues. The 1/2-inch NPT port gives the return line a stated connection point. With aluminum construction and 1/2-inch inlet and outlet connection sizes listed, the kit is specifically presented as a FASS sump.

Skip it if you want to avoid drilling the tank; the FASS SK5501 requires a hole, so this installation is not suitable for that constraint.

This fits a FASS system owner seeking a bottom-of-tank suction point, integrated return plumbing, and the listed single-bolt installation. It still requires drilling a hole, so account for that step before choosing it.

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

#2 · Built-In Return

2. ZHSYMX Fuel Tank Sump

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

Best for: Integrated-return diesel truck installs.

Why it ranks #2: Built-in return and no-tank-drop installation suit diesel lift-pump upgrades; the kit also includes a 3-inch hole saw.

The built-in fuel return is the key distinction on this ZHSYMX sump, giving installers a port to route return fuel back into the tank. Its no-tank-drop installation and included 3-inch hole saw also support a direct installation workflow for compatible diesel trucks.

The stand pipe separates return fuel from feed, while the built-in return port gives the return line a dedicated route back to the tank. The kit is listed for Cummins, Duramax, and Powerstroke trucks and works with stock and aftermarket tanks, offering broad application within those categories. A 3-inch hole saw is included, but drilling still requires care to keep debris out of the tank. The manufacturer advises against off-road use and vehicles with ground-clearance concerns.

Skip it if you need a sump for off-road use or a vehicle with ground-clearance concerns; this kit is specifically not recommended for either.

This suits a Cummins, Duramax, or Powerstroke owner seeking a tank-mounted feed and integrated return without dropping the tank. Avoid it for off-road or low-clearance applications, and take care to remove drilling debris.

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

#3 · More Hose Sizes

3. SMALLFATW Dual-Port Sump

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

Best for: Dual-hose-size diesel plumbing.

Why it ranks #3: Dual-port use can support a return line or double feed, and its included fittings accommodate both 1/2-inch and 5/8-inch hose IDs.

Two hose-ID options make the SMALLFATW sump useful when fuel-line sizing is a key installation decision: it includes fittings for both 1/2-inch and 5/8-inch hose. Its dual-port arrangement can provide a return connection or serve as a double feed for increased fuel flow.

The CNC-machined billet aluminum top plate and housing have a black anodized finish, while the brass fittings provide the listed connections for two hose sizes. That combination gives installers options for matching a line setup without relying on only one supplied hose ID. The kit is compatible with Airdog, FASS, and other fuel pumps for Cummins, Duramax, or Powerstroke applications. Its dual-port function supports either return plumbing or double-feed use.

Skip it if you want a stated hole saw or no-tank-drop installation; the ZHSYMX sump explicitly lists both a 3-inch hole saw and no-tank-drop installation.

Choose this for a compatible diesel truck build where the choice between 1/2-inch and 5/8-inch hose, or return versus double-feed plumbing, matters. The supplied listing does not state an included hole saw.

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

#4 · Extra Brass Included

4. SMMS Integrated Return Sump

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

Best for: Hole-saw-equipped integrated-return kit.

Why it ranks #4: This aluminum dual-port kit combines integrated return with a 3-inch hole saw and extra brass, and lists compatibility across several diesel platforms.

The included 3-inch hole saw is a practical differentiator for the SMMS AUTO PARTS sump, supplying the tool size specified for making the tank opening. The kit also combines an integrated return with dual ports and is listed for several Ford, Dodge, and GM diesel applications.

The integrated-return dual-port arrangement gives the fuel system a stated return function, while the included extra brass provides additional listed hardware for the installation. The aluminum body has an oxidized surface, which the listing identifies as part of its construction. Applications include Ford F250 and F350, Dodge 5.9 Cummins and Ram 2500, plus GM Duramax. The 3-inch hole saw is included, but the exact vehicle model should be checked against the product details.

Skip it if you require an explicitly stated no-tank-drop installation; the ZHSYMX kit specifically lists installation without dropping the tank.

This suits listed Ford, Dodge, or GM diesel owners who want an integrated return and the hole saw included. Match the application to your exact truck, since the supplied details name selected models and engines.

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

#5 · Longest Warranty

5. Qqrchontics Diesel Sump Kit

• Compatible with Vehicle Type: Truck

Best for: Diesel lift-pump line routing.

Why it ranks #5: Designed for FASS and AirDog on Cummins, Duramax, and Power Stroke applications, it includes a 3-inch hole saw and lists a one-year warranty.

A dedicated bottom-mounted pickup connection is the central purpose of the Qqrchontics kit, providing a connection point for aftermarket lift-pump installations. The listing names FASS and AirDog systems and Cummins, Duramax, and Power Stroke truck applications, and includes a 3-inch hole saw.

The bottom-mounted pickup gives a designated connection point for lift-pump plumbing, which the listing says can simplify fuel-line routing on diesel trucks. FASS and AirDog compatibility is specified, along with Cummins, Duramax, and Power Stroke applications. The included 3-inch hole saw supports the tank-opening step, and the included 1/2-inch fittings provide stated connection hardware. These are installation-relevant details, but the supplied information does not describe an integrated return function.

Skip it if you need a clearly specified integrated return; the ADsunves sump lists a dual-port design with integrated return functionality.

This fits a diesel-truck owner adding an aftermarket FASS or AirDog lift pump and seeking a dedicated pickup point with drilling hardware included. If return routing is essential, the supplied details do not confirm that function.

Listed on Amazon as: Fuel Tank Sump Kit for Diesel Trucks, Compatible with FASS and AirDog Lift Pump Systems, with Integrated Return & Hole Saw, for Cummins/ Duramax /Power Stroke Applications

#6

6. sixcow Fuel Tank Sump

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

Best for: Sediment-conscious lift-pump setups.

Why it ranks #6: Its 6061-T6 aluminum construction and sediment-collection feature suit high-flow lift-pump setups, with stated compatibility for Cummins, Duramax, and Powerstroke.

A sediment-collection feature distinguishes this sixcow sump, aiming to reduce the amount of sediment flowing to the fuel filter. It is listed for high-flow lift pumps such as Airdog and FASS, with applications including Cummins, Duramax, and Powerstroke engines.

The stated sediment collection can help limit sediment reaching the fuel filter, while the sump’s bottom pickup is described as allowing use of fuel lower in the tank and addressing air-sucking concerns when the tank is not full or a fuel tube is broken. Its 6061-T6 aluminum construction is the specified material. Compatibility covers high-flow pumps including Airdog and FASS and several diesel engine families, so confirm the application against your setup.

Skip it if you need a listed integrated return port or included hole saw; the SMMS AUTO PARTS sump explicitly lists a return kit and 3-inch hole saw.

This suits a high-flow lift-pump installation where the sediment-collection feature is relevant to the fuel-filter setup. Its listed engine applications include Cummins, Duramax, and Powerstroke; the supplied details do not list a return port.

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

#7

7. Dyno Racing Aluminum Sump

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

Best for: Anodized aluminum lift-pump sump.

Why it ranks #7: The anodized 6061-T6 aluminum sump is listed for FASS, AirDog, Fuelab, and other high-flow lift pumps, with a six-month warranty.

The Dyno Racing sump uses black-anodized 6061-T6 aluminum, giving this high-flow-pump option a specified corrosion-preventive finish. Its application list includes Airdog, FASS, and other aftermarket lift pumps, with Cummins, Duramax, Powerstroke, and other engines named.

The listing says the sump can address air-sucking when the tank is not full or a fuel tube is broken, and that it allows the tank’s remaining fuel to be used. Those functions are relevant to a lift-pump setup, while the 6061-T6 aluminum and anodized black finish specify the construction. Compatibility includes high-flow pumps from Airdog and FASS and multiple engine families. The supplied details do not state a hole saw or return-port configuration.

Skip it if you need a hole saw included for the tank opening; the Qqrchontics kit lists a 3-inch hole saw in its included components.

This is a candidate for owners pairing a sump with an aftermarket high-flow lift pump across the listed engine applications. Its materials and fuel-pickup claims are specified, but the listing does not state included drilling hardware.

Listed on Amazon as: Aluminum Fuel Tank Sump Kit For Cummins Duramax Powerstroke Diesel and Gas Fuel Sump Compatible With FASS Airdog Fuelab Pump and Other Aftermarket Lift Pumps

#8

8. ADsunves Diesel Sump Kit

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

Best for: Dual-port return for diesel lift pumps.

Why it ranks #8: Its dual-port integrated-return design targets diesel lift-pump use and 1/4-tank starvation; the listing states a one-year warranty.

A dual-port design with integrated return is the ADsunves sump’s core feature, combining a fuel pickup with a stated route for return fuel. The listing says it draws from the tank’s lowest point and addresses quarter-tank fuel starvation for compatible AirDog and FASS systems.

Drawing fuel from the lowest point is described as a way to address fuel starvation when the tank is around a quarter full, while the integrated return supports return-line routing. The listing also connects its fuel supply to acceleration, climbing, and heavy loads. AirDog and FASS compatibility is specified, and the product is identified as a truck sump made from stainless steel. These stated features may suit a lift-pump setup, though no hole saw is listed in the supplied details.

Skip it if you need a hole saw included for tank installation; the SMMS AUTO PARTS kit lists a 3-inch hole saw with its sump.

This suits a truck owner using an AirDog or FASS setup who wants a low-point pickup and integrated return. The supplied details do not specify drilling hardware, so it may not meet buyers seeking an included hole saw.

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

#9

9. Generic Integrated Return Sump

• Material: Iron
• Compatible with Vehicle Type: Truck
• Material Type: Iron

Best for: Three-bolt clamping sump replacement.

Why it ranks #9: Dual ports and an integrated return address diesel fuel-flow needs, but its iron construction and limited fitting details make comparison harder.

A three-bolt design sets this Generic sump apart, distributing clamping pressure around the O-ring to help minimize slippage and prevent leaks. Its dual ports support fuel-system installation, and the integrated-return description identifies a route for return fuel in compatible diesel-truck setups.

The three-bolt arrangement applies clamping pressure around the O-ring, with the listing linking that setup to reduced slippage and leak prevention. Dual ports can facilitate installation, while the product is described as an integrated-return sump. It addresses low-fuel pickup issues around a quarter tank and factory draw-straw limitations. Compatibility is stated for Airdog, FASS, and other pumps for Cummins, Duramax, or Powerstroke engines; the specified body material is iron.

Skip it if you specifically want aluminum construction; the Dyno Racing sump lists 6061-T6 aluminum with a black anodized finish.

This suits a diesel-truck owner replacing a sump and valuing the stated three-bolt O-ring clamping design and integrated return. Its specified material is iron, a relevant boundary for buyers choosing by construction material.

Listed on Amazon as: Diesel Fuel Tank Gas Integrated Return Sump Kit, Dual-Port Fuel Tank Sump Replacement, Compatible with Airdog FASS Cummins Duramax Powerstroke, Integrated Return

#10

10. Competition Engineering C4041

Best for: Weld-in universal tank fabrication.

Why it ranks #10: This gas-tank sump has two 1/2-inch NPT fittings, but welding is required and its design is less suited to the diesel lift-pump focus.

Welding is required on the Competition Engineering C4041, making it a fit for a fuel-tank project that can accommodate a welded sump rather than a clamp-in installation. It comes with two 1/2-inch NPT weld bungs, installation instructions, and a tank-baffling template.

The two female 1/2-inch NPT fittings provide defined threaded connections for the fuel plumbing, while the included template supports baffling work on the tank. Because welding is required, installation calls for fabrication capability and is not a simple no-weld attachment. The instructions provide a reference for the installation process. This universal sump is listed as a gas tank sump, so the stated application is centered on gas-tank projects rather than a specific diesel truck fitment.

Skip it if you need a no-weld install; the FASS SK5501 uses a single-bolt design and specifies no-tank-drop installation.

This is for a fabricator setting up a gas tank who can weld the sump and use its baffling template. Skip it for a bolt-on installation or when the project requires a stated diesel-truck fitment.

Listed on Amazon as: COMP.ENG/MOR Competition Engineering C4041 GAS TANK SUMP, TWO 1/2 IN. NPT FEMALE FITTINGS