I changed my fuel pump today in my 99 ml430 to fix my fuel gauge. I bought the car about a month ago knowing it had this problem and ordered the pump. After changing the pump I went to the gas station to fill the tank and the guage is now working correctly !!!!! But I also noticed that take off from a stand still was tremendously better? It wasn't running bad before but there is now a huge difference in how well the car accelerates !!! occasionally I would feel a slight miss when accelerating at medium speed. This was going to be another proj. but it is now FIXED. I got a two for one deal..... I guess the old pump had low fuel pressure? The car only has 70k on it?

was the wiring in the pump burned or melted?

The wires looked fine. But there was corosion on the fuel gauge sending unit board and a nasty brown film all over every part of the old pump

on many i have replaced, the wires going to the pump had melted insulation

diidnt you replace the fiilter when you replaced the pump ?
maybe less restrictiion,

If you didint replace the CPS yet, plan on iit.

my 99 had a bunch of problems from 90-95,000 but has been GREAT from 95,000 to 120,000 miiles.

__________________
Steve Danville
what i did myself.
CPS
rear shocks
MAS x 3.
SparkPlugs (twice)
Fuel pump & Filter
Window switch
replaced both failed horns with Honda horns.
Cleaned ERG Tube
Oil changes
Oil consumption Fix
Brake Pads
A/C Recharge
Anti-Freeze change X 2.
Front Shocks. Monroe. $90
Mercedes Warrenty Work:
Harmonic balancer,power steering clamp. Cat converters.Drive Shaft Bearing.s
Replaced Outer Lower Tie Rods and front lower ball joints at 156,000 miles

It had recently been done by the dealer before I bought the car. Only changed the pump to fix the fuel guage