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How to check bad fuel pressure regulator?

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Old 10-13-2009, 07:58 PM
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1994 e320 sedan
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, 11:45 PM
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1994 E420
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, 11:59 PM
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1994 e320 sedan
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; 10-14-2009 at 12:02 AM.
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Old 10-14-2009, 05:32 AM
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95' AMG SeeThreeSix
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, 01:42 PM
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1994 e320 sedan
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, 03:41 PM
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1994 e320 sedan
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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