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Question

Just tried to change a fuel injector on my 2001 CLK 320 but when i went to start the car I'm not getting any fuel to the main 'U' fuel mainifold that feeds the injectors. Its as though the fuel pump has just stopped working, Can it be something to do with the cars EECU?

Submitted: 63 days and 17 hours ago.
Category: UK Car
Value: $32
Status: AWAITING CUSTOMER ACTION
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Optional Information

Year: 2001
Make: Mercedes-Benz
Model: CLK
Engine: 320

Already Tried:
Detached the main fuel line to the 'U' mainifold but no fuel coming through when trying to start the engine.

Posted by 350matt 63 days and 16 hours ago.

Answer

Hello
The electric pump should only run for a few seconds when the key is first turned to ignition and it then switches off until the engine starts, if its not doing this short prime then I'd check the fuse and relay for the pump first and make sure the fuel reset button hasn't been knocked.

If all of this is OK then it may be something to do with the ECU and I'd try resetting the ECU by disconnecting the battery cables and clamping them together for 10 mins.

This will reset all the systems on the car and you'll need the radio security code to get the radio going again. That is the way to re set the Ecu - but -- if that hasn't worked - you have a fault with either the wiring - or the Ecu itself...

Edited by 350matt on 9/20/2009 at 10:43 AM

63 days and 16 hours ago.

Reply

where is the fuel reset button?

 

Answer

Hello

There are a few locations depending on when and where the car was built, usually hidden away in the boot behind the trim panel, or under the bonnet on the back of the engine bay firewall.

Another possibilty for the lack of fuel could be the crank position sensor. The replacement cost is about £60 from mercedes and it's near the back of the engine on top where the gearbox joins

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Expert: 350matt
Pos. Feedback: 98.6 %
Accepts: 
Answered: 9/20/2009

Mechanical Engineer

Engineering degree BEng Hons, Have repaired & modified my own and others cars for 20 years,

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