1312257 Fuel Hose | Genuine Volvo Penta Part

🔧 Product Description

A genuine Volvo Penta flexible fuel-service hose with an approximate length of 620mm. The formed hose is used in selected D4 and D6 engine installations where a flexible connection is required between rigid fuel or engine service lines. Volvo catalogues the item as a fuel hose, although its exact routing is controlled by the engine's serial-numbered lubricating and service-line parts list for your engine. The original hose should be matched by length, bore, end fittings and formed orientation.

🚤 Compatibility

• Engine Family: D
• HP Range: 145-480 HP
• Year Range: Approximately 2010s - 2020s

Full model list at the end of this description.

⚙️ Key Features

• OEM Volvo Penta part number 1312257
• Supplied cut to length L=1000mm
• Net weight 0.32 kg
• Supersedes previous part number 943707, which itself replaced 835774
• Grouped under Miscellaneous, Repair Kits in the parts structure
• Fits D4, D6 and D8 series marine diesel engines
• Engine type: Volvo Penta common-rail marine diesel fuel / engine service hose
• L=280mm / L=440mm / L=600mm (Volvo assembly listing)

🔌 Function

Carries diesel fuel between engine fuel system components such as the feed and return lines, filters and injection system. It provides a flexible connection that absorbs engine vibration and movement without stressing rigid fuel pipework.

⚠️ Common Signs of Failure

• Visible fuel weeping, staining or drips at the hose body or clamped ends
• Cracking, hardening or perishing of the outer cover with age and heat exposure
• Soft, swollen or delaminating hose wall causing internal debris and filter blockage
• Air being drawn into the fuel system, causing hard starting, rough running or power loss
• Kinked, chafed or collapsed sections restricting fuel flow

🛠️ Service Notes

• Renew the sealing washers, O-rings or seals that belong to the connection rather than reusing them, and do not put jointing compound on a fuel union to cure a weep
• Fit the hose without twist, and support and clip it along its run so it cannot chafe or hang its own load on the end fittings
• Keep the hose clear of hot exhaust and moving parts, and cap the open ends while working so nothing gets into the fuel system
• Tighten unions to the figure given in the workshop manual for your engine — overtightening a fuel fitting distorts the seat and makes the leak permanent
• Bleed the fuel system afterwards, then run the engine and check the whole run for weeps under working pressure, with no ignition sources near and a means of containing spilt fuel to hand

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 1312257 → Supersedes 943707 → Supersedes 835774

OEM / Related Numbers

• 943707 earlier number superseded by this part
• 835774 earlier number superseded by this part
• D6-300A-G engine installation reference

📦 Condition

• Genuine Volvo Penta part
• Brand new
• Supplied in original or equivalent packaging

🔎 Full Model Compatibility

Typically suits:

• Volvo Penta D6-340I-G, D6-380I-G, D6-440I-G, D6-480I-G, D6-300A-G, D6-340A-G, D6-380A-G, D6-440I-WJ-G, D6-480I-WJ-G, D6-300D-G, D6-340D-G, D6-380D-G, D6-440D-G, D6-480D-G, D6-400A-G, D6-440A-G, D6-300I-G, D6-480A-G
• Volvo Penta D4-175I-G, D4-230I-G, D4-270I-G, D4-320I-G, D4-300I-G, D4-150A-G, D4-230A-G, D4-270A-G, D4-320A-G, D4-300A-G, D4-145I-G, D4-175 VG
• Volvo Penta D8A5-A MH, D8A6-A MH, D8A5-A MG, D8A6-A MG