Product Description
FASS STK5500B DIESEL FUEL SUMP KIT WITH SUCTION TUBE UPGRADE KIT
The FASS STK5500B combines FASS’s no-drop tank sump bowl with a 5/8" convoluted suction tube upgrade to cure common 1/4-tank starvation and improve fuel supply to high-demand systems. The “B” kit is designed to work with an existing bulkhead fitting and keeps all lines inside the tank for a clean, protected install.
Fitment & System Notes
- Applications: Universal — Ford Powerstroke, GM Duramax, Dodge/Ram Cummins, and other diesel fuel tanks.
- Design: Lowers suction point to the lowest spot in the tank; draws from inside the sump bowl (no external lines).
- Use case: Ideal when you already have a FASS bulkhead installed (e.g., STK1002) and want to upgrade to a sump draw.
- Material: 6061-T6 billet components with sealing hardware for leak-free service.
Installation & Manuals
View FASS’s install guides here: FASS Installation Manuals. Direct PDF for this kit: STK-5500B Installation Manual (PDF).
Cross-Reference & Related FASS Items (CPP Diesel)
- STK5500 — same sump kit with bulkhead fitting included.
- STK1002 — bulkhead fitting kit (pairs with STK5500B when a bulkhead is needed).
- STK1003B — 5/8" suction tube upgrade for existing STK1002 bulkhead.
- Popular pairing with FASS systems: TSF16250G and other Titanium Signature Systems.
FAQ
What’s the difference between STK5500 and STK5500B?Functionally the sump bowl is the same, but the B kit does not include the bulkhead fitting. Use STK5500 if you need the bulkhead included.
Will this fix my 1/4-tank issue?
Yes—by drawing fuel from the lowest point inside the sump bowl, the kit significantly reduces common 1/4-tank starvation on aftermarket lift-pump setups.
Do I need external lines underneath the tank?
No. The design keeps the pickup inside the tank and routes through your existing bulkhead for a clean install.
Which bulkhead kit works with STK5500B?
Use the FASS STK1002. If you already have STK1002 and just need a tube upgrade, see STK1003B.
Specifications for Fass STK5500B
| Brand | FASS Fuel Systems |
| Part Number | STK5500B |
| Kit Contents | No-drop sump bowl + 5/8" convoluted suction tube (for use with existing bulkhead fitting) |
| Material | 6061-T6 billet aluminum components |
| UPC | 850044106936 |
| GTIN | 0850044106936 |
| Shipping Info | Ships ground; typical handling 1–2 business days (transit times vary by destination) |
| Prop 65 | Yes — Cancer and Reproductive Harm |
