How do you troubleshoot a cranks but don't start on a 1983 Mercedes Benz 380SL?

Answer 1

First make sure you have gas in it! Then the fuel pump needs to run, it is back under the trunk near the differential, paired with a filter. If pump not running, try the relay behind the glove box.

To be certain it is a fuel issue, first remove the air cleaner and squirt some starter fluid down the throat and give it try.

If you have gas and the pump is running, the fuel distributor may be blocked, located under the air filter housing.

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Try replacing the OVP regulator or check that fuse. The regulator controls things like idle, fuel mix, etc. If you jump started your baby after storing for a while it usually blows this fuse. The regulator is found just to the right of the fuse box in the passenger well. Remove the lower dash and you should see 3 regulators closest to the door opening. One of them should have a red plastic cap on it. Pull out the whole regulator (note which way is up for replacing it). There is a 10 amp (probably blue) GM looking fuse in the regulator. Check to see if it is blown. If so, this is likely a major issue. The car will run without it but not very well. If it is not blown, try replacing the whole regulator. eBay about $25.