Cranking but not starting

Tiny
BLESSING EWOBOR
  • MEMBER
  • 2011 MERCEDES BENZ GLK
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 221,452 MILES
Hi, I am currently working on the car listed above. I have checked the fuse and relay relating to it, they have no problem. There is spark coming from the spark plugs, the fuel injectors were pulsing but when I checked the fuel rail, I realized that the fuel pump is not pumping out fuel. I located the fuel pump under the back seat, I tested it there was no power source, I tested the fuel pump control module, there's power source on one of the small wires but there is no power source in any of the wires that connected the module and the fuel pump.
Does that mean the module is bad or is there any thing else to check for? Please also help me with the circuit diagram of system.
Thursday, September 10th, 2020 AT 6:11 PM

7 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
You should have power on two wires coming to the control module. The red/green wire and the pink/white wire.

If you don't have 12 volts on these two then we need to check both the fuses and go from there.

Let me know what you find. Thanks
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Thursday, September 10th, 2020 AT 6:37 PM
Tiny
BLESSING EWOBOR
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Thank you but the first picture is blur. Please could you make it clear?
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Thursday, September 10th, 2020 AT 7:31 PM
Tiny
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Sorry. That is just a screen shot of the entire wiring diagram that you can zoom in on. The others are zoomed in on the fuel pump components. However, here is the same diagram a little closer.
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Thursday, September 10th, 2020 AT 7:59 PM
Tiny
BLESSING EWOBOR
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Thank you, I have fixed it.
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Saturday, September 12th, 2020 AT 5:18 PM
Tiny
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Okay, great. Can you let us know what the repair was because that info will surely help others that visit this site that may have a similar issue? Thanks for any updates.
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Sunday, September 13th, 2020 AT 6:51 PM
Tiny
BLESSING EWOBOR
  • MEMBER
  • 687 POSTS
The problem was a fuse in the rear Sam control unit (20A), it was not contacting properly.
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Wednesday, September 16th, 2020 AT 9:52 PM
Tiny
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Awesome. You are fixing them left and right. Thanks for the update and continuing to come back. Talk to you next time.
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Thursday, September 17th, 2020 AT 1:47 PM

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