how many fuel pumps does a Mecedes e320 have?

2003 Mercedes E320 does have two pumps the left side (driver side) is where the fuel filter/transfer pump is located this pump takes fuel from that side of tank and pumps it directly into the fuel pump on the right side of tank. A common problem is that the transfer pump begins to leak and that is where you get the smell of gasoline. My E320 was driving fine and when I got to my destination and tried to restart it would crank but not start after a 45 min wait it started again, I got about 15-20 mins down the road and it stalled again had it towed home, where it started again, had transfer pump and filter replaced 6 months earlier so I believe it is now the actual fuel pump going out (located on right side passenger side)