Yeah, it is the lift pump for fuel. Mine was leaking a bit. I was able to tighten the 3 bolts on top from the bedroom access.
I think I was able to find a gasket available somewhere, but it took some looking. I ended up not buying one. It would also be a lot of work to remove and reseal it. A new pump is quite pricey, too.
Just tighten the bolts and see how it goes.