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Part 256‑07091‑00 is listed as a female fuel line connector, 3⁄8″ barb, for Mercury fuel tanks (98‑newer).
The two parts appear to be the male side and female side of a quick‑disconnect fuel hose system: male (engine/tank end) + female (mate) side. The listing for the male says “Connects With Female 256‑07091‑00 quick‑disconnect”.
These are used in marine fuel line systems where you have a portable tank and an outboard engine, and a “quick‑disconnect” fitting is used to attach/detach the fuel line easily. For example, Mercury offers quick‑disconnect connector kits for their outboards.
From the available info:
256‑07092‑00
Male thread: ¼″ NPT (National Pipe Thread – tapered)
Hose barb sized for ~3⁄8″ inner diameter hose (in the listing)
256‑07091‑00
Female quick‑disconnect side with 3⁄8″ barb for fuel hose.
The typical hose inner diameter: Many Mercury/Mariner fuel systems use 3/8″ ID fuel hose (≈10 mm) for portable tanks and outboards. (Some older systems may use 5/16″ (≈8mm) ID hose)
These connectors are designed for portable fuel tank lines and outboard engine side lines in marine environment — so corrosion resistance, quick‑disconnect convenience, and compatible hose/clamps matter.
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| Brand | Unbranded |
|---|---|
| Manufacturer Part Number | 256-09291-2F |
| 256-07092-00 | Male fuel hose fitting, thread type ¼″ NPT (male) |
| 256-07091-00 | Female fuel line connector, 3⁄8″ barb |
| Unit Quantity | 1SET=2PCS |
| Type | Mercury/Mariner fuel systems use 3/8″ ID fuel hose |

