Never ending saga with world's slowest C55 AMG.
01-23-2012, 08:54 PM
#77
Have the car running and back probe the fuel pump connector and check what voltage you have there. You should have close to battery voltage which should be 13.6-14.1 area. If that test good then remove the fuel line at the fuel rail. Place the line in a jug larger than 1L. Have someone jump the fuel pump relay for 60 secs (I have to double check the time length). Then measure the amount of fuel. You should have 1L or more. I really have to double check that but I'm 99% sure its correct.
01-23-2012, 09:24 PM
#78
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2005 E55 AMG
Have the car running and back probe the fuel pump connector and check what voltage you have there. You should have close to battery voltage which should be 13.6-14.1 area. If that test good then remove the fuel line at the fuel rail. Place the line in a jug larger than 1L. Have someone jump the fuel pump relay for 60 secs (I have to double check the time length). Then measure the amount of fuel. You should have 1L or more. I really have to double check that but I'm 99% sure its correct.
01-23-2012, 09:44 PM
#79
Checking it with the pump running will show if there's a voltage drop when there's a load on it. Ive seen the rear sam melted causing 12v at the connector but when the pump was on only 9v there.
01-23-2012, 10:23 PM
#80
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2005 E55 AMG
Al the cars I've ever owned have had such simple fuel pump setups...my goodness...lol.
Last edited by GT-ER; 01-23-2012 at 11:07 PM.
01-23-2012, 11:07 PM
#81
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2005 E55 AMG
Guys, I need to know, is the pump I should be concerned about the one on the drivers side? It had thick gauged wires so can I assume this is the primary pump?
01-24-2012, 09:06 PM
#83
The fuel pump is actually on the pass side. M3 is the fuel pump. The wires enter on the drivers side fuel sender and then runs across the inside the fuel tank to the pump.
01-24-2012, 09:47 PM
#84
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2005 E55 AMG
Thank you guys for all your help. I installed a new pump and it works PERFECT now. Now more hesitations and no more +22 LTFT's. The car pulls clean and all the way to 100mph without starving up on top. I don't know how much power it may have gained but at least it feels very peppy.
Now, time to dyno it again. It feels like forever but this is was the hardest car I've ever had to diagnose, and it was just a stupid fuel pump. It's actually the first time I've ever seen a fuel pump die on any car I've worked on....weird.
12-30-2017, 11:28 AM
#85
I know how rejsend feels. Ordered by E43 with Ray Catena in Edison July 22 and still waiting. Car was manufactured December 8. I have the PO and vin#. I tried a few of the sites and the vin comes back as an error. Anyone have netstar access so I can track my P.O. for potential ship and delivery date?
12-30-2017, 12:58 PM
#86
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I know how rejsend feels. Ordered by E43 with Ray Catena in Edison July 22 and still waiting. Car was manufactured December 8. I have the PO and vin#. I tried a few of the sites and the vin comes back as an error. Anyone have netstar access so I can track my P.O. for potential ship and delivery date?
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RenC55AMG (12-30-2017)
