My Craftsman push mower does have the Briggs and Stratton engine, but if
you are standing behind it where the handlebars are, the gas tank is on
the right side of the engine, and the oil tank is on the left side of
the engine.

But what I still don't get is, how is it that when I turn the gas tank
up on its left side, and the gas in the tank is facing down towards the
ground, then why does gas leak UP and out and through the air filter
which is facing upwards towards the sky?????

Before I bought this craftsman mower 2 years ago, I was using an old 22
inch Murray push mower that was like 20-30 years old. It also had a
Briggs and Stratton engine. I would always tilt that lawnmower up on its
left side as well, to scrape the underneath, when I was done mowing the
lawn. That mower NEVER leaked not even one drop of gas or oil, when it
was tipped up on its side, or even tipped completely over!!!!

Even though they both have Briggs and Stratton engines, is Murray a
better brand mower than Craftsman??? Or is it simply just because stuff
was made better back then??? 20 or 30 years ago, they made better
quality items, that were built to last?????