Join Date: Feb 2011
Vehicle: 2001 SLK320
Other Toys: 78 MGB, 84 Camaro, 85 Trans Am, 96 Firebird, 00 Sonoma, 06 Escalade
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Classic symptoms of a wet PSE pump. Search the forum for wet PSE pump threads and you'll find tons of info.
In the mean time, pull out the trunk carpeting, spare tire, jack kit, etc. On the right side you'll see a foam box, pull it out (carefully) and you'll find the PSE inside. Dry the trunk floor (I bet it's wet), dry the PSE pump out (I've had good luck just blowing on it with a warm hair dryer for awhile). Then make sure your trunk seal is installed correctly and the drains (in the trunk through and fuel fill areas) are clear and following well.
Then wrap the wires going into the PSE with some paper towel (keeps water from wicking down them onto the pump) and re-install everything. The foam box is a bit of a struggle to get back in place, so be patient.