I recently purchased a 2006 Passat 2.0 that the previous owner replaced both fuel pumps due to it stumbling upon acceleration. After charging the battery up I got it to start and run (roughly). I removed the HPFP to inspect the follower since they didn’t and it was fine. After installing the HPFP I could not get the car to start. In this video I show how to test for a bad fuel pump in one quick and easy step. This won't fix your problem but it will save you a lot of time diagnosing th It activates on impact and kills power to the pump. Inertia switches do go bad and are another possible reason a fuel pump won’t run. What Does A Relay Do? Fuel pump circuits employ a relay to control a high amp circuit with a low amp circuit. They are either external and fitted in the fuse box or ECM integrated. If your fuel pump has an Fuse box diagram (location and assignment of electrical fuses and relays) for BMW 5-Series (F10/F11/F07/F18; 2011-2017) (518d, 520i, 520d, 523i, 525d, 528i, 530i, 530d, 535i, 535d, 550i). If you like that power probe you can get it on Amazon here → http://www.amazon.com/gp/product/B00G4YUWMC/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creativ Vay Nhanh Fast Money.

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