HOWO Injector Fuel Return Pipe VG1099089065 / VG1099089064 (VOSS Quick-Connect)

The VG1099089065 injector fuel return pipe is the short leak-off line that takes surplus fuel from the injectors back to the return gallery on SINOTRUK WD615 engines. This is the VOSS quick-connect version: the formed nylon pipe pushes straight onto the adapter and locks with a metal clip, so there is no banjo bolt and no copper washer under the hose end.

The assembly covers two part numbers, and in practice you need both:

– OEM No.: VG1099089065 — formed nylon return pipe with SV249 quick couplings at both ends
– OEM No.: VG1099089064 — brass adapter, M8 × 1.25, with galvanised copper sealing washer (one per injector)
– Aftermarket cross-reference: VG1540080065B, VG1540080066
– Application: HOWO 371 / 375, A7, T7H, T5G; Sitrak C7H — WD615 / WP10 series injector leak-off
– Quantity per engine: 6 — one short pipe per injector, chained back to the return line
– Pipe material: heat-stabilised nylon, black, moulded to clear the rocker cover
– Adapter material: brass body, galvanised copper washer
– Tightening torque: 7 N·m ± 1 N·m
– Connection: VOSS / SV249 quick-connect with retaining clip

**Why they fail.** The nylon hardens from heat and diesel over time and cracks at the moulded bend, and the O-ring inside the quick coupling flattens. The usual symptoms are a diesel smell around the engine, a damp patch on top of the cylinder head, and a hard cold start after the truck has stood overnight — a leaking return line lets air back into the fuel system while the engine is off, so it has to crank before fuel reaches the injectors again. Long-term seepage also lifts the paint off the rocker cover.

**Fitting.**

1. Screw the brass adapter in by hand. The plastic pull ring and PVC sleeve hold the copper washer in place so it cannot drop into the head.
2. Pull the plastic ring out.
3. Torque to 7 N·m ± 1 N·m. Do not exceed it — the adapter is brass and the thread is only M8.
4. Peel off the PVC protective sleeve.
5. Push the nylon pipe onto the adapter until the clip clicks, then pull back lightly to confirm it is locked.

Replace all six while you are in there. If one pipe has gone brittle the other five are the same age, and a single failed pipe is enough to keep the hard-start problem. Do not try to straighten or heat the pipe to fit — it is moulded to a fixed shape and will kink.

Brand-new parts, 12-month warranty, in stock for worldwide shipping. Request a quote for the export price.

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