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I'd look for a leak. I had a diesel many a year ago that had a small hose leak and had similar symptoms. It'd suck air in the link and I'd have to re-prime the pump. Sometimes it would be fine, even over night. Think it depended on the external air pressure.
Document the issue if you still have a warranty.
Good luck!
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- 2013 Victory Red ZL1 - 210K+ miles. Mods: Who needs mods...its a freaking ZL1 - Last car: 2006 GTO
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