All they have changed is the obvious and most common parts. On a car with an intermittent fault it takes a lot of diagnostics and testing to find the real cause. Simply throwing parts at the car will not solve the problem. They changed the fuel filter, and I believe they were getting close with that, but again they have not tested the fuel pump, and that should of been the second test and not the last.
They didn't EXACTLY say they tested the fuel pump, but they did say "The fuel pressure test passed just fine"
Yes, they most probably put the fuel guage on in the workshop and tested the line pressure on a stationary car. The test needs to be performed under normal driving conditions, especially as this is an intermittent problem. I am not saying this is a fuel pump problem, but I suspect so and it needs to be tested correctly so as to prove or disprove this possibility.
On April 26, it tried stalling 4 separate times throughout the day and then actually died where I had to turn the key off and restart the vehicle.
I immediately dropped it off at the dealership again on Saturday the 26th of April. They have had it since then, claim they have put 700 miles on it and not been able to reproduce the problem. I'm going to pick it up again tonight, now May 7, 2008, yes 11 days later. So all in all, this car has been in the shop more in the past 5 weeks than on the road.
The tech said with 99.9% certainty, it is not the fuel pump. When physical/mechanical parts break, they break and are not intermittent, which I agree but there is that chance yet. They did test the fuel pressure under operating conditions, but again, the vehicle did not do it for them they claim.
We'll see I guess. I'm having a hard time ever even looking at a Benz again if this is all the help I can get on their vehicles!
Vehicle ran fine all day Thursday May 7, Friday May 8 and over half the day Saturday May 9. Saturday evening, stalled and left us on the side of the road for 15-20 minutes.
Dropped vehicle off at dealership again (5th time) yesterday, Monday May 12. Just got a call from them today, Tuesday. They have finally been able to reproduce the problem. When problem occurred, they could hit the underside of the fuel tank and the pump would kick back in, then go back out after a short while. Also, there was a electrical connector related to the fuel pump that they said was 90% melted and shorting out. They replaced the connector and pump and want me to drive it for a week or two before we "settle-up!"
Fingers crossed, going to get it at noon today!
Running total of replaced parts and procedures completed due to this issue:
Hmmm, hitting the bottom of the tank sound awfully familiar to me. But, I'm sure that that is the problem 100%. Good luck and I hope that it runs well.
Vehicle ran fine all day Thursday May 7, Friday May 8 and over half the day Saturday May 9. Saturday evening, stalled and left us on the side of the road for 15-20 minutes.
Dropped vehicle off at dealership again (5th time) yesterday, Monday May 12. Just got a call from them today, Tuesday. They have finally been able to reproduce the problem. When problem occurred, they could hit the underside of the fuel tank and the pump would kick back in, then go back out after a short while. Also, there was a electrical connector related to the fuel pump that they said was 90% melted and shorting out. They replaced the connector and pump and want me to drive it for a week or two before we "settle-up!"
Fingers crossed, going to get it at noon today!
Running total of replaced parts and procedures completed due to this issue:
Your Tech has a strange understanding of diagnostics, I posted way back to check the fuel pump. With diagnostic codes, its not only what you see its what you dont see.
The fault you were experiencing could have been the CPS that much I would agree. But most of the fault codes were pointing to a fuel problem and a faulty fuel pump/fuel pump wiring connector would not give a code. And thats exactly why I said they had not done a correct fuel line pressure test whilst on road test.
I only hope they drained the fuel tank and cleaned the tank and tank filter, its standard practice with Benz. I mean the tank filter and not the fuel filter. If they havent done this then the problem may and I say may occur again.
Thanks for posting the result
PS, if the car runs OK for the next week or so then ask for the old MAF and CPS to be put back on, why pay for something you did not need to start with and a cut in the labour cost of replacing items that did not fix the problem.
Last edited by eric242340 : 05-13-2008 at 07:50 AM.
I doubt they have the old parts but I have thought about that already.
I know what I am willing to pay, and it's a lot less than their going to ask!
Need to wait a week or so before any "negotiations" take place though.
I'm considering my $900 already spent as pretty good down payment on this new fuel pump replacement.
With this faulty melting connector, is that on the pump itself? Would the pump be bad due to this connector or could they have simply changed this connector out and left the pump in there?
I doubt they have the old parts but I have thought about that already.
I know what I am willing to pay, and it's a lot less than their going to ask!
Need to wait a week or so before any "negotiations" take place though.
I'm considering my $900 already spent as pretty good down payment on this new fuel pump replacement.
With this faulty melting connector, is that on the pump itself? Would the pump be bad due to this connector or could they have simply changed this connector out and left the pump in there?
Not sure what they have done, I only worry about what they havent done concerning the fuel tank and tank filter, or if they even know it exists. As for the fuel pump connector, it could be a bad pump caused by bad fuel or age. Faulty fuel pumps do get hot and in your model the pump is in the tank which, Im sure you understand is risky, fuel fumes and heat dont mix too well.
Faulty connector can also cause heat but I dont believe this to be the case.
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