Remove the fuel pump cutoff relay and jump two of the pins: 87 and 15. If it starts, your relay is bad. If your relay is bad, your fuel pumps probably shorted it. May as well replace the relay and the pumps, or you'll keep burning through $150 relays.
2003 S500 Black/Charcoal
1990 560SEL 61k Arctic White/Grey
1988 420SEL Black/Palomino Sold @ 85k
1987 420SEL Midnight Blue/Grey
1986 420SEL Diamond Blue/Grey
1983 380SEL Champagne/Palomino