PeachParts Mercedes-Benz Forum - View Single Post - How do you safely charge the battery in a 98 e300d?

jay_bob · #3 02-14-2015, 08:10 PM

Agreed. Connect a battery charger on standard rate (~ 10 A) to the + terminal and the rear engine lifting lug. The + terminal is in a black cube on the left side of the engine bay near the fuse box. It has a + on the cover that lifts up and reveals a brass stud.

Or just pop out the back seat cushion and go directly across the battery.

Let it go about 8 hours or so.

Tomorrow:

If you can, push the car so that the front is lower than the rear. That will help gravity do its job to get fuel from the tank. Check to see if any fuel is leaking from the low pressure side of the system and correct that. You may have to put the car back on the flat again to avoid getting a bath in fuel if you end up separating the lines to fix any issues. Remember that the low pressure fuel line connectors have a white clip. This clip should not be pushed all the way to the end of its travel, that is the "release" position. The clip should be left in the middle of its travel, it will float back and forth.

Remove the plastic cover over the top of the engine (8 Allen head screws 6 mm IIRC).

Using a 14 mm open end wrench, carefully loosen the nut on the top of each injector about a half turn.

Have a friend crank the car. 20 seconds max, rest for 60 seconds between tries, wait 5 minutes between groups of 3 tries. That is the most conservative regimen to avoid harming the starter.

While cranking, watch the joint between the fuel line and the nut at each injector. As soon as you see fuel coming out steadily tighten each nut back down. You have to do this to release the trapped air between the delivery valve and the injector. Otherwise the trapped air will not let any fuel get to the injector. Don't worry if you can't get through all of them in one crank cycle, that is ok. Once you have purged a high pressure line, it will stay purged as long as you don't introduce air back in the system from the low pressure side. Hence why you have to fix the low side first.

These really are great cars, don't give up on it! I bought mine in March 2013 and have since put 25k miles on it, I am up to 221k.