P008700 Fuel presusure too low
Today | 09:18 AM
#1
Thread Starter
Newbie
Joined: Oct 2024
Posts: 2
Likes: 0
E220 CDI
P008700 Fuel presusure too low
Hi there,
Maybe someone can help here.
My car, Mercedes E Class, W212, 2010, E250 diesel.
Suddenly stopped on te road and I got it towed to my mechanic.
After testing with the computer, we got P008700 error, low fuel pressure in the system.
After many weeks of testing injector, high pressure fuel pump, replacing fuel filter, fuel pump and the relay beside the fuel pump, and replacing the ECU, nothing worked.
It will run for 10 to 30 min, then stops.
When we checked the coltage on the fuel pump, it was down to 3.5V
As a test, we bypass the relay the powers the fuel pump, ( the one beside it, underneath the back seat) with separate power that its only on when the ignition is on, and that got the engine running, no problem.
Has power, runs smoothly without any issues.
But I have a feeling that it could cause issues in the long run.
Question is, what exactly control the voltage going to the fuel pump?
Has anyone come accross this issue?
Regards,
Louie
Maybe someone can help here.
My car, Mercedes E Class, W212, 2010, E250 diesel.
Suddenly stopped on te road and I got it towed to my mechanic.
After testing with the computer, we got P008700 error, low fuel pressure in the system.
After many weeks of testing injector, high pressure fuel pump, replacing fuel filter, fuel pump and the relay beside the fuel pump, and replacing the ECU, nothing worked.
It will run for 10 to 30 min, then stops.
When we checked the coltage on the fuel pump, it was down to 3.5V
As a test, we bypass the relay the powers the fuel pump, ( the one beside it, underneath the back seat) with separate power that its only on when the ignition is on, and that got the engine running, no problem.
Has power, runs smoothly without any issues.
But I have a feeling that it could cause issues in the long run.
Question is, what exactly control the voltage going to the fuel pump?
Has anyone come accross this issue?
Regards,
Louie
Today | 03:53 PM
#4
MBWorld Fanatic!
Joined: Apr 2019
Posts: 6,206
Likes: 3,839
From: Silicon Valley
MY'14 W212 M276 3.5NA @60kMi
parts canon led to pump
Hi there,
Maybe someone can help here.
My car, Mercedes E Class, W212, 2010, E250 diesel.
Suddenly stopped on te road and I got it towed to my mechanic.
After testing with the computer, we got P008700 error, low fuel pressure in the system.
After many weeks of testing injector, high pressure fuel pump, replacing fuel filter, fuel pump and the relay beside the fuel pump, and replacing the ECU, nothing worked.
It will run for 10 to 30 min, then stops.
When we checked the coltage on the fuel pump, it was down to 3.5V
As a test, we bypass the relay the powers the fuel pump, ( the one beside it, underneath the back seat) with separate power that its only on when the ignition is on, and that got the engine running, no problem.
Has power, runs smoothly without any issues.
But I have a feeling that it could cause issues in the long run.
Question is, what exactly control the voltage going to the fuel pump?
Has anyone come accross this issue?
Regards,
Louie
Maybe someone can help here.
My car, Mercedes E Class, W212, 2010, E250 diesel.
Suddenly stopped on te road and I got it towed to my mechanic.
After testing with the computer, we got P008700 error, low fuel pressure in the system.
After many weeks of testing injector, high pressure fuel pump, replacing fuel filter, fuel pump and the relay beside the fuel pump, and replacing the ECU, nothing worked.
It will run for 10 to 30 min, then stops.
When we checked the coltage on the fuel pump, it was down to 3.5V
As a test, we bypass the relay the powers the fuel pump, ( the one beside it, underneath the back seat) with separate power that its only on when the ignition is on, and that got the engine running, no problem.
Has power, runs smoothly without any issues.
But I have a feeling that it could cause issues in the long run.
Question is, what exactly control the voltage going to the fuel pump?
Has anyone come accross this issue?
Regards,
Louie
AtoZ got replaced without improvement until the tank pump 03.5V got directly connected then everything works.
What low and high pressures are available?
What's the mileage?
Any other chassis faults that impact CAN-C?
I wonder if tank pump uses a 3-phase controller like GDI low-pressure feed. Is sensor shot ?
Last edited by CaliBenzDriver; Today at 03:54 PM.
Today | 04:10 PM
#5
Out Of Control!!
Joined: Feb 2011
Posts: 14,807
Likes: 1,065
From: Shepardstown, WV
1999 E300TD
look to MB wiring diagram PE47.40P-2101DAC the 651.911 fuel pump is controlled by N118 fuel pump control mod---first remove all the BS wires you attached then check front SAM fuse f34 and rear SAM fuse f42 if ok then you have a faulty N118 fuel pump control mod(under R rear seat)----fyi there is no relay in the 651 fuel system----forget all the other HS
