Damn, you are probably right!!!!
The supposed transmission fluid is also suspiciously light...! The annoying thing about fluids is that they sometimes find an inexplicable path and then only appear somewhere else...!
The seal on the tandem pump is new, possibly I didn't tighten the screws enough... it's also really difficult to access those parts...!
On the other hand, there's some moisture on the underside of the fuel line connected to the pump. I'm going to replace the hose and clamp.
Thank you for your support!