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2001 S430 - 190k, 2007 GL450 - 140k
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70 Posts
Discussion Starter #1
Hi, all
This morning my 2007 GL450 refused to start. It seems that I have left my radio on and it drained the battery. I have tried to jump-start my car from my other car.

Engine is cranking, but it does not start. I have checked and there is no fuel at fuel rail. I have confirmed that my fuse is good as well as the fuel pump relay. Before leaving for work I have pulled the battery and set it to charge.

After work I have checked all fuses and opened the right fuel pump access door. There is no power at fuel pump terminals when key is turned on. I have confirmed with DAS that the key is recognized and that all authorizations are on.

Any suggestions what my next steps should be?
 

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Registered
2001 S430 - 190k, 2007 GL450 - 140k
Joined
·
70 Posts
Discussion Starter #2
I have made some more troubleshooting. My findings:
1) When ignition is turned on there is +12v on fuel relay pin 86 and 3.4v on pin 85. There is no ground signal on fuel relay, so it is not activated.
2) When pins 87 and 30 are manually connected there is 12v on fuel pump connector. Fuel pump still does not start.
3) When 12v is applied directly to fuel pump it does not engage.

I have ordered a replacement fuel pump and will test connect it when it arrives. But there is still an issue of No Ground to fuel relay.
 
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