Mine hasn't been working at all for years, i tried to take it out once but it seemed impossible without making damage to it or the paint so I let it be. The pump work fine but nothing comes out. If you find a solution then please do share...I'm gonna give it a go myself tomorrow and see.

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BMW X5 E53, 4.8iS - 2005
Professional Stereo/Nav with DSP (modified BM54 module) - Converted to Eonon GA5166X with Reverse cam
4-Corner Air Suspension - Converted to BC Coilovers