It's been a few days, so I thought I'd chime in with an update of sorts.
After the talk of sealing issues with the tank / pump flange, I pulled the tank out of the box again to have a look (I was going to put off mounting this up for a month or 2 until I have the time). I didn't like what I saw.
The plastic appeared to be melted or something, as well as the opening was trimmed a bit to close to this threaded insert:
The insert at the middle / right is much closer to the opening, and I was concerned that the gasket would not have the area to properly seat.
Here's a web shot of the pump flange and gasket:
I emailed "Just Gas Tanks" (seller) with some of these photos and they responded quickly (by email and phone) that they would ship out another tank, but they were all out of the white. BTW, they did mention that these tend to have less than flat mounting areas.... Kudos to them and their great service!! So my new red tank showed up today with a prepaid return ticket for the white one.
Lot's of expensive plastic hanging around....
I opened them both up to compare the mounting areas.
The red one has a nice even cut out for the pump, but it's definitely not flat.
The surface on the underside is also very porous, or looks like the molding process was very bubbly. I looked hard at the white tank in the glare, etc. and couldn't find any areas like this. Not sure if this is standard or not....
Here's a quick shot of the uneven surface at the mounting plate area:The steel square is sitting on the 2 opposite inserts. Looks like a bit of light sanding may be the trick.
Not trying to make a big thing of this, as I've never dealt with an aftermarket tank before, just thought I'd show some details on these and hopefully get some feedback.
Thanks!