Mercury Mariner Fuel Tank Connector 1/4in NPT Female MMS-3315
mms-3315
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Mercury / Mariner Tank-Side Fuel Connector
1/4in NPT female tank thread | post-1998 connector family
A screw-on tank-side connector for a portable fuel tank with a 1/4 in NPT male outlet. Its quick-connect profile is marketed for the later Mercury/Mariner family and selected Force applications; the mating hose connector must match the actual nose, latch and seal.
Key Features
- 1/4 in NPT female tank thread
- Mates with the later Mercury/Mariner-style fuel-line connector
- Marketed for Mercury/Mariner 1998-on applications
- Marketed for selected Force 1993-on 40 HP+ applications
- For compatible portable fuel tanks
Technical Specs
| Tank thread | 1/4 in NPT female |
| Required tank outlet | 1/4 in NPT male |
| Quick-connect family | Later Mercury/Mariner-style tank connection |
| Fuel-line class | 5/16 in (7.9 mm) connector family |
| Position | Portable tank side |
| 4Boats SKU | mms-3315 |
Compatibility / Fitment Guide
Advertised application family: Mercury/Mariner 1998-on, 4 HP through V6, plus selected Force 1993-on 40 HP and above. These year/horsepower ranges are guidance only; Mercury and Force used more than one connector pattern.
| Tank-side thread | The portable tank must present a sound 1/4 in NPT male outlet. NPT is tapered; do not substitute BSP or a parallel thread that appears similar. |
| Mating hose connector | Compare the fuel-line connector’s latch, internal seal, nose depth and 5/16 in family profile with this fitting. It must click/lock fully and release only when operated. |
| Model check | For Mercury/Mariner 1998+ and Force 1993+ applications, inspect the existing tank fitting or consult the engine/tank parts diagram. Year and horsepower alone are insufficient where a tank or hose has previously been changed. |
| Installation | Use only a fuel-compatible thread sealant approved for tapered fuel fittings; keep sealant away from the fuel passage. Support the tank fitting while tightening to avoid cracking the tank boss. |
| Not suitable for | Engine-side connector positions, 1/4 in BSP threads, earlier/different Mercury bayonet profiles, modern pressurised tank systems unless expressly approved, or any connector that does not lock and seal positively. |
Part Number Cross Reference
| Application family | Mercury/Mariner post-1998 tank-side pattern |
| Additional advertised family | Force 1993-on 40 HP+ |
| Tank thread | 1/4 in NPT female |
| 4Boats SKU | mms-3315 |
No verified Mercury OEM part number is printed in the live product data, so none is invented here. Select by tank thread and physical connector profile.
Frequently Asked Questions
Does it screw into a 1/4in female tank port?
No. This connector itself has a female NPT thread and requires a male 1/4 in NPT tank outlet.
Is 1/4in NPT the same as 1/4in BSP?
No. Their thread forms and pitch differ; do not force them together.
Will it fit every Mercury after 1998?
Not automatically. Confirm the mating hose connector and tank port because systems may have been replaced or use another connector family.
Is this the engine connector?
No, it is described as the tank-side threaded fitting.
After assembly, prime the system and leak-test the thread and quick connector in a ventilated area before starting the engine.
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