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Old 06-29-2006, 11:23 PM
Glen's Avatar enthusiast
Join Date: Sep 2000
Location: Carlsbad, CA USA
Posts: 1,187
faulty fuel pressure regulator?

The fuel pump in my '95 E320 wagon started making noise recently. In general, no noticable drivability problems with on exception. On right turns, the engine will stumble as if starved for fuel for a couple seconds then clear up and be fine.

I started by changing the fuel filter...same thing. Next I changed the fuel pump...again, same thing. Can a faulty fuel pressure regulator cause the fuel pump to work hard enough to vibrate and make a loud buzzing noise? If not, what else should I be looking at?

Car is a W124, 3.2 M104. 177,000 miles.


Glen Tokuhara
Beauty & the Beast and the wagon that could!
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Old 06-30-2006, 08:49 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Fuel pressure on that should be 55-60psi...IF the pressure is too high then you should have a check engine lamp & drive-ability problems...also the fuel mileage should be WAY down...

Have the fuel pressure & delivery volume checked..very easy..about 5-10 minutes

Sounds like fuel contamination to me.
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Old 06-30-2006, 12:35 PM
Glen's Avatar enthusiast
Join Date: Sep 2000
Location: Carlsbad, CA USA
Posts: 1,187
No CEL but there is a stored code 4 in the diagnostics module.

Also pin 14, gives codes 5 and 11.

I'll try to check fuel pressure this weekend...

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