Saturday, December 21, 2013
When to Bleed a Gas Hose
Any time a high-pressure fuel system is opened for service, air is introduced into the fuel hose. Bleeding, which requires running fluid through the hose, will eliminate air from the system and help reduce vehicle stalling and intermittent operation problems. The fuel system must be bled to prevent these hazardous operating conditions.
Fuel Filter Work
The fuel hose must be bled when the fuel filter is replaced. Typically, fuel filters are ahead, behind or both ahead and behind the fuel pump. Some fuel filters are made of clear plastic or glass to make it possible to visibly locate the presence of air.
Fuel Pump Work
Modern fuel-injection systems may have two or more fuel pumps. Each of these is designed to work at high pressure. Any time a fuel pump is replaced, it needs to run for a few moments to pull enough fuel through to draw air bubbles out of the fuel line.
Fuel Hose Work
Deteriorated or damaged fuel hoses or lines may themselves draw in under the vacuum of a fuel pump. When a fuel hose or line is replaced, the fuel system should be bled under pressure to draw out any air.
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