Can a fuel hose collapse under a PCV system?
The fuel hose is designed for internal pressure. It will collapse under the vacuum of the PCV system. PCV hose is designed specifically so it won’t collapse. So insist on PCV hose, never fuel hose or vacuum hose.
Can a vacuum hose stand up to PCV?
The vacuum hose won’t stand up to the oil that comes through this [PCV] system. The fuel hose is designed for internal pressure. It will collapse under the vacuum of the PCV system. PCV hose is designed specifically so it won’t collapse.
What does the top of a PCV valve do?
A hose connects the top of the PCV valve to a vacuum port on the throttle body, carburettor or intake manifold. This allows the vapours to be siphoned directly into the engine without gumming up the throttle body or carburettor. The flow rate of a PCV valve is calibrated for a specific engine application.
What makes a PCV valve stick to the crankcase?
A PCV valve that flows too much air will lean the air/fuel mixture, while one that flows too little will richen the mixture and increase the risk of sludge buildup in the crankcase. The cold temperature could cause a PCV valve to freeze and stick because of moisture drawn through the PCV system.
The fuel hose is designed for internal pressure. It will collapse under the vacuum of the PCV system. PCV hose is designed specifically so it won’t collapse. So insist on PCV hose, never fuel hose or vacuum hose.
What kind of hoses are used in a PCV system?
They design the hoses in the PCV system for vacuum and to be oil resistant. Vacuum hose has a stiff sidewall to resist collapsing. These are very different from fuel hose or heater hose, which they design to hold pressure. Always replace PCV hoses with the original equipment molded hose, from the vehicle manufacturer.
What is the breather hose on a PCV engine?
So there is also a breather hose that draws air from the intake hose into the crankcase. Pushing blow-by gasses to the intake isn’t always good for the engine, so the PCV Valve has a plunger that adjusts the gas flow in response to pressure in the crankcase and vacuum in the intake.
Can a leaking PCV system cause a check engine light?
Hose may become oil soaked and swell, preventing them from sealing. Many hoses get hard with age and crack. A leaking PCV inlet or outlet hose can cause a check engine light or allow debris into the engine. They design the hoses in the PCV system for vacuum and to be oil resistant. Vacuum hose has a stiff sidewall to resist collapsing.