Yeah, it comes down to specs importer specifies when ordering from Chinese. Japanese consumers are extremely discerning and require top-quality. U.S. consumers? not so much. When Japan was forced to import GM cars as part of trade-agreement in '80s, no one would buy them unless they were re-painted to higher standards.
We've been getting crap parts here for decades, just noticed it more lately due to Trump's anti-China propaganda. But it's importers for FLAPS that have been buying at lowest-prices possible to maximise profits. Thus we're getting lowest quality as well. So many parts are bad right out of box and needs to be tested and confirmed functional before using.
Thanks for tip on pump! If needed, I'll replace with brand-name pump with known good track-record Quantum or All Balls from Canada ( also made in China). Mitsubishi pump hard to find here, I'll look for it. Will also do solid-state driver mod to replace clicker, which is more likely to fail than pump itself.
BTW, I haven't had any issues buying from Ali, I buy tonne of stuff for bikes and cars. I look for vendors with +97% rating with easy return/refund policies. Only issue I had was Noco-clone battery-charger that died in a month. They sent me another one promptly and it's been working great! Also bought water-cooled ceramic ball-bearing turbo for my Porsche at 1/20th of Garrett's price. Working perfectly at double factory boost for past 7-yrs. 🙂