I have replaced the fuel pump and the crank sensor and the car has plenty of gas. It has 198k miles but still wont crank over. I put the key it, the engine turns and turns and turns and just wont kick over. I am unsure what to do next. Can someone please help me.

Fuel pump and crank sensor aren't cheap - what led you to believe they needed replacing? Did you check for spark?

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280

If the gas comes at the motor with suitable pressure i would check for injector activity because it is easier than checking spark. If there is none i'd smack the K40 relay around a bit.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician

I have no idea where the K40 relay is... And How would I test the injectors.

I suppose current ramping is out, maybe audibly.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician

Where is the relay switch?

Where is the K40 relay switch on this car?

Isn't it near the ECU?

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1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible

Yes both are in the electrical center, right rear of eng compartment.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician

Did you have any luck with this, as I have a similar problem with my 1997 e320?