If fuel can leak out, then air can leak in. That stupid pump is one of the most mentioned items on this forum. It has stranded people on the road, and has caused at least a few cars to be sold. For $16 at Fastlane, just change it.

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Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
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