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E-Class (W124) 1984-1995: E 260, E 300, E 320, E 420, E 500 (Includes CE, T, TD models)

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Old 10-13-2009, 06:58 PM   #1
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How to check bad fuel pressure regulator?

Hi,

Does anyone know absolute way to check a FPR?
I heard that if I can smell fuel from the vacuum hose connected to FPR, means bad. However, I want to know if there is another way to check.
I don't want to do any guess and keep changing wrong parts.
I have changed a fuel filter, OVP, plugs and wires due to cold starting issue.

Thanks.
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Old 10-13-2009, 10:45 PM   #2
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What you need is a vacuum hand pump with a gauge on it. Once you have your pump, hook it up to the fpr by simply connecting it with a small peice of rubber hose (but make sure its tight and doesnt leak) and see if it holds a vacuum. If it doesnt hold a vacuum then its bad.
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Old 10-13-2009, 10:59 PM   #3
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Thank you for the reply.
Where can I get the tool? Can I rent it from some auto parts store?
If you have a picture of the tool, please let me know.

Or if it's that easy, should I just ask a mechanic to do it? I am sure it will be either free or $20...

Thanks.

Last edited by gorillajin; 10-13-2009 at 11:02 PM.
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Old 10-14-2009, 04:32 AM   #4
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http://www.harborfreight.com/cpi/cta...emnumber=39522

Very useful troubleshooting tool. So many things on these cars are vacuum actuated, including most of the climate control components, door locks etc.


Also a generic version:
http://www.harborfreight.com/cpi/cta...emnumber=92474
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Old 10-14-2009, 12:42 PM   #5
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Thank you so much for the link. I will buy it today, and post here how is my FPR.
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Old 10-14-2009, 02:41 PM   #6
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I got the tool, and tested the FPR.
It hold compression just fine. I guess FPR is ok.
Now what should I check?

As I said, changed OVP, fuel filter, spark plugs&wires, and FPR is fine.
Can this be ignition coil?
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Old 10-14-2009, 02:41 PM
 
 
 
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1986, 1994, 300e, bad, check, e420, find, fpr, fuel, pressure, regulator, smell, test, troubleshooting, vacuum, verify



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