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1 - PCV Valve Hoses
Part of the positive crankcase ventilation system. This line
leads from the valve cover to the engine intake. In the picture at
left, the stock 4-mm rubber hose is was replaced by a 4.8-mm reinforced
fuel line. It is less likely to clog, and lasts longer.
The check valve (PCV valve) needs periodic replacement. The plastic
valve cover nipple, grommet (bushing) and larger diameter hose may also
need replacement if leaking oil. |
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2 - MAP Sensor
Not the same part number and material as the other hoses (possibly
silicone rubber from the factory). It seems more durable, and should
probably only be replaced by a compatible silicone hose. It leads
to the manifold air pressure (MAP) sensor. |
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3 - Fuel Pressure Regulator
From the throttle body to the fuel pressure regulator (FPR).
The FPR is on the driver side of the fuel rail, below the charge
air pipe and behind a connector bracket. The view on the left is
from the driver side fender, and after unplugging the three connectors.
This line can be hard to inspect and replace because most of it is hidden
under fuel rail wiring. |
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4 - Charge Air Bypass Valve
Runs along the "charge air pipe" to the turbo bypass valve (BPV) at
the front of the engine compartment. This is the longest of the four
hoses. |
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5 - Evap System Purge Valve
The purge valve hose for the Evaporative Emission System connected
to the throttle body is not an actual vacuum line (different size and material).
It allows fumes to be sucked from the charcoal canister in the wheel well
into the intake and burned. However, if the hose is broken, or the
purge valve faults, the effect can be the same as a vacuum leak.
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PCV Components
a - Valve cover bushing #7515190
b - PCV nipple #9165903
c - Rubber hose #9189465
d - Generic 4-mm rubber hose, NAPA H-459
e - PCV check valve #7521313 |
Vacuum Hose Length
1a - 240 mm
1b - 60 mm
2 - 220 mm
3 - 400 mm
4 - 800 mm
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References
EPC 2-0690 Crank Case Ventilation
Hose Techniques
(online silicone hose vendor)
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