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Old 02-25-2011, 01:49 PM
JamesDean's Avatar
Electrical Engineer
 
Join Date: Apr 2005
Location: NE Ohio
Posts: 5,038
Symptoms Bad Fuel Pressure Regulator m117

Hey everyone,

I'm just wondering, what might be some symptoms of a bad fuel pressure reg?

On this 560SEL it has trouble with power under operating temp and if you stomp on the accelerator, the throttle takes a bit to respond to the demand. However if you accelerate slowly it will climb in rpm fine.

The vent line at the regulator is broken, I can feel a woosh of air coming out the back of the regulator. This makes me thing the diaphragm is broken and the unit is not maintaining the needed pressure of 6.5 Bar (I think thats the number)

I dont have any CIS gauges to put on the system so I can't be 100% sure of the pressure. It just seems to want to stall out occasionally. I think this is due to too much fuel, as I recall reading that the FPR is more of a dampener than a "regulator"..

Let me know what you gents think....
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