FF5320 Fuel Filter for Duramax 6.6L Silverado Sierra 2500HD
The FF5320 is a spin-on diesel fuel filter on a 1-14 thread, and it also carries the numbers FF3003, BF7633, 1R-0750, P551313, P8334 and FF1079. It fits the Duramax 6.6L in the 2001-2016 Chevrolet Silverado and GMC Sierra 2500HD and 3500HD, and it takes out both free and emulsified water before the fuel reaches the injection system.
📋 Key Specs
| Part Number | FF5320 |
| Filter Type | Spin-on diesel fuel filter |
| Thread Size | 1-14 UNS-2B |
| Outer Diameter | 95 mm (3.75 in) |
| Application | Duramax 6.6L 2001-2016; Chevrolet Silverado / GMC Sierra 2500HD, 3500HD |
| Service Interval | Every 30,000 miles |
| Notes | Removes free water and emulsified water; replaces FF3003, BF7633, 1R-0750, P551313 |
❓ FAQ
It is a spin-on diesel fuel filter with a 1-14 thread. It screws onto the filter head by hand and is sold under several numbers, including FF3003, BF7633, 1R-0750 and P551313.
The Duramax 6.6L in the Chevrolet Silverado and GMC Sierra 2500HD and 3500HD from 2001 to 2016, plus other models listed as compatible with the part numbers in this page.
FF3003, BF7633, 1R-0750, P551313, FF5814, P1104, P8334, FF1079, 86528, 35310549, 51914349, LFF3347, WDK 950/1 and 33528.
No. This is one fuel filter. The water separator used on the same systems is a separate part number and is not in the box.
Every 30,000 miles. Change it sooner if the fuel is dirty or the vehicle sits unused for long periods, because water held in the can starts corrosion from the inside.
MOQ varies by product: 5–100 units for standard parts (see product page). Tier pricing decreases with volume. Custom parts usually ≥ 50 units, evaluated by process.
Stock/short-run: 7–15 days; bulk orders 20–35 days; custom 30–45 days incl. sampling. Note your deadline in the inquiry — sales will confirm capacity.
Add products to the inquiry list and submit with contact info. Sales contact you within 24h and issue a formal quotation (tier pricing + proforma invoice) within 48h. The AI assistant can pre-fill inquiries in chat.
Yes. We develop from drawings/samples and support private labeling. Process: evaluation → sampling (15–25 days) → approval → mass production.
Payment: T/T 30% deposit + 70% before shipment / L/C / Trade Assurance. Shipping: FOB Ningbo/Shanghai, CIF or DDP; EU & NA warehouses; sea/air/express.
ISO 9001 & IATF 16949; CE/UL/ATEX on key products. Every batch ships with inspection reports; third-party inspection (SGS/BV) supported.
Description
Product Overview
The FF5320 is a spin-on diesel fuel filter on a 1-14 thread. It screws onto the filter head by hand, seals on the gasket ring at the top, and comes off the same way — no housing to open, no element to drop in. That is the whole reason this format survives on trucks: the filter is the only part that gets replaced, and the head stays bolted to the chassis.
What it does is two jobs in one can. It holds back the particulate that would otherwise reach the injection pump and the injector seats, and it takes water out of the fuel — both the free water that settles as droplets and the emulsified water that stays mixed in and is the harder of the two to catch. On a common-rail diesel the pump is lubricated by the fuel itself, so water that gets past the filter is not just a contamination problem, it is a wear problem at the most expensive part of the fuel system.
It is listed for the Duramax 6.6L in the Chevrolet Silverado and GMC Sierra 2500HD and 3500HD from 2001 to 2016, and the listing also covers other models compatible with the part numbers below. The fifteen references on this page are what most parts counters will look up, so the filter can be matched by whatever number is on the old can rather than by the truck alone.
Key Features
Cross Reference
The fifteen numbers above all describe the same can. Some of them come from the equipment side and some from the filter makers, which is why one part shows up under both a Caterpillar-style number and a Baldwin-style number. Read the number off the old filter before ordering, then find it in this list — that is a more reliable match than going by the truck model, because the same engine was built with more than one filter head over the years.
Specifications
Applications
Fit it to the Duramax 6.6L in the Chevrolet Silverado and GMC Sierra 2500HD and 3500HD built from 2001 to 2016, and to any other application that lists one of the fifteen numbers above. If the old filter carries a number that is not on this page, stop and check before ordering — there are several similar-looking cans in this thread size and they are not interchangeable.
Before fitting, wipe the filter head face clean and check that the old gasket came away with the old filter; a gasket stuck to the head is the most common cause of a leak on a spin-on. Oil the new gasket with clean diesel, screw the filter on until the gasket touches, then tighten by hand — three quarters of a turn is the usual figure, and a wrench is what distorts the can and makes it leak.
Change it at 30,000 miles, and earlier if the fuel is dirty or the truck sits for long periods, because water in the can is what starts corrosion from the inside. The filter is covered for 90 days against manufacturing defects.
📄 Downloads
- FJ-1001-datasheet-en.pdf · 2 KB
