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  #1  
Old 03-17-2021, 06:36 PM
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Fuel pressure question for 1986 Mercedes 190e 2.6

My friend has a 1986 Mercedes 190e 2.6 and it wont stay running. It will start and run but it wont stay idle. He is asking me what the fuel pressure should be for his particular motor, but I'm thinking he may just need a new fuel pump or a regulator (not sure about the car). Has anyone had that issue or know what the fuel pressure should be for that particular engine? Or had that same issue? I found data on the 2.3, but not a 2.6.
Thanks


Last edited by sandyeggo; 03-18-2021 at 08:14 PM.
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  #2  
Old 03-17-2021, 10:02 PM
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52- 55 psi, volume of 1 litre in 20 seconds
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  #3  
Old 03-18-2021, 12:31 AM
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Location: Modesto CA
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Quote:
Originally Posted by sandyeggo View Post
My neighbor has a 1986 Mercedes 190e 2.6 and it wont stay running. It will start and run but it wont stay idle. He is asking me what the fuel pressure should be for his particular motor, but I'm thinking he may just need a new fuel pump or a regulator (not sure about the car). Has anyone had that issue or know what the fuel pressure should be for that particular engine? Or had that same issue? I found data on the 2.3, but not a 2.6.
Thanks
sd:

Can the engine be kept running above idle with the throttle? If so, it's unlikely that fuel pressure is the culprit.
In any event, KE-Jetronic (CIS-E) operates at a minimum pressure of 78psi for a single pump system, up to 90psi for dual pump systems.
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Old 03-18-2021, 05:15 AM
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If the fuel filter has not been changed in years, I would suspect it's the problem. Fuel filters should be changed every 60,000 miles in that vintage vehicle.
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Fred Hoelzle
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  #5  
Old 03-18-2021, 12:02 PM
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Location: Southern California
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Failure of the fuel accumulator is not uncommon. Usual symptom is hard starting - long cranking time that is intermittent, but gets more frequent over time.

Search for threads started by me to learn how to do a simple on the car test and a failure analysis of the fuel accumulation in my like vehicle a few years ago

Duke
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Old 03-24-2021, 04:54 PM
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Thanks for the help, he says your feedback gave him what he needed
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Old 03-24-2021, 06:07 PM
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Originally Posted by sandyeggo View Post
Thanks for the help, he says your feedback gave him what he needed
sd:

There were four answers, two of them conflicting on one subject, and the other two on separate subjects. Pray tell, what was of use?
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  #8  
Old 03-26-2021, 08:36 AM
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Trevor Hadlington
 
Join Date: May 2014
Location: Worcestershire in England
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The fuel volume test is 1 ltr in 45 seconds for M103

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