| SDV8/TDV8 fuel return line questions | |
Hi, I'm writing in hopes someone may be experienced with how a SDV8/TDV8 fuel return path works. I've just sent my injectors for testing and they came back within factory specs so no problems there. As I started tracing on how the return fuel line works I seem to have stumbled across some oddities on the design.
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Based on the diagram:
2. Injector leak off return line. 8 injectors return merged into 1 hose which connects to (2) (A) return line. The line later merges with the T joint (B- no 1 way valve) but connects in between of low pressure lift pump and the fuel heater (5) (C) before going back into HPFP.
As I understand the low pressure pump delivers a constant 5 bar fuel pressure. Would this mean the T joint (B) is constantly pushing fuel back to the injector leak off pipes? I tried pushing low pressure air through (A, B, C) openings and air can escape from either ends.
Should the injector leak off return be better being routed back to (3) line as this is the hose where the excess from HPFP and fuel rail being released back into the fuel cooler which ultimately goes back into the fuel tank?
The system doesn't look right to me and I'm not sure if I'm missing anything out. Appreciate your inputs. Thanks.
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