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I'm on the other side of the street. Two motorcraft tanks with caps that came straight from the Ford dealer and they couldn't tighten up because the click part was weak. Bought an aftermarket tank and the cap was much stronger in the click part of the assembly.
My recollection is match the parts: OEM tank and cap or aftermarket tank and cap. Don't mix.
Correct, dorman/generic china cap & tank threads different that original oem & thus not interchangeable. With pretty much everything being made over there (incl motorcraft) you've got to be careful
Dorman bottle I put in about a month ago works fine with the OEM cap. In fact it looks and feels no different than the OEM replacement bottle that lasted 100k miles.
Sounds like the bottle might be the problem either way. That looks like it might be one of the old style Dorman bottles that didn’t fit right with the OEM cap, so I’d chuck it just because of that alone. Those pinch clamps on the little sucker hose need to go too. The one on the rad end was actually causing a cold leak.
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