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The pressure inside the vacuum hose is lower than the pressure outside the hose. If the hose is old and weakened, it'll fold up on itself. If the pressure difference is bigger than the hose is expected to be able to deal with(by some other reason) the hose will collapse too.
If someone has replaced a real vacuum hose with, say a fuel hose, that too can be a reason.
What else can I help you with?
What creates vacuum on a 350 Chevy engine?
The engine itself creates Vacuum once it is running.
Why does removing oil cap stall engine?
Removing the oil cap with the engine running causes a vacuum leak in the positive crankcase ventilation. This causes too much air to enter the cylinders at once, which results in a stalling engine.
What causes code p171?
Assuming you mean P0171, it is a lean condition Bank 1. If the engine is running okay I would look for a vacuum leak around the engine, maybe a vacuum hose disconnected or cracked. If the engine is running poorly it could be a plugged fuel filter, a faulty fuel pressure regulator or a faulty fuel pump.
Do diesel engine produce vacuum when running?
no a diesel does not produce vaacuum when running. but vehicles that require vacuum for the brakes have a vaccuum pump attached to the engine to supply the needed vaccuum
What causes your 2004 expedition air to blow low while accelerating?
you have a control vacuum leak, listen for hissing noise under dash when engine is running.
Does the fuel pressure regulator on a 96 suburban has a vacuum hose?
NO. When a engine is running it makes it's own vacuum. That's why there is no vacuum hose on that year regulator. It is inside of the engine.
What causes engine to idle high in a 1987 Chevy S-10?
vacuum leak, check the gasket under the throttle body for a vacuum leak. Spray some carb cleaner around the base of the throttle body while the engine is running. If there is a vacuum leak you will hear a change in the rpm's when you hit the right spot.
If sitting in idle vacuum can be at?
Quality vacuum gage is required ;-) engine at running temperature around 18 to 20 inches Hg = vacuum
How to Check vacuum on 1987 Chevrolet celebrity?
Take a vacuum hose off at the intake manifold and put a vacuum gauge on the port, then read the vacuum with the engine running.
Engine running lean 95 Chevy blazer?
Check for vacuum leaks.
What causes radiator hoses to collapse?
Radiator hoses can collapse due to a restriction in the cooling system, such as a blocked radiator or thermostat. This restriction causes a vacuum to form in the hoses, leading them to collapse under the pressure difference. Additionally, weakened or deteriorating hoses can also collapse over time due to the force of the coolant flowing through them.
What causes uneven idling and running?
Could be,in need of a tune up, a vacuum leak, contaminated fuel (water), If we knew what year, make, model and engine more info would be available.
