Question about 1986 Cadillac DeVille

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Secondary pump 86 de ville

The pump is located on the driverside fender under the car can not see from the engine compartment, runs all the time when the car is on has lines that run to the motor. dont think it is the air leveling pump.

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Sounds like your talking about an engine air pump. If so and its not belt driven then it will run while the engine runs.

Posted on May 14, 2009

  • lkat3573517 Dec 24, 2010

    the pump that you are talking about is like u said underneth the battery compartment on the drivers side its an external vacumm pump what it does is when the engine is running because the engine doesn't create enough vacumm at idle that pump runs when the ignition is in the on position to supply more vacumm to the engine for for things that run off of vacumm like the brake booster,egr valve, map sensor things like that

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Please take time to rate this fixya.

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