Ml320 2002 long crank
04-11-2018, 06:37 PM
#1
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2002 ML-320
Ml320 2002 long crank
hi there my ML320 2002 sometimes takes a long time cranking before staring. Once it starts, if you shut it off and then back on it stars without any issue or without a long crank. No error codes or check engine light.
Changed the CPS a few days ago. No change. im thinking it’s the fuel filter or fuel pump. So I tested fuel pressure at the fuel rail valve. 55PSI while idling.
Once the car shuts off the pressure instantly drops. I thought the pressure was supposed to hold and bleed gradually. What does this mean? Is this a filter/pump issue or something else?
Changed the CPS a few days ago. No change. im thinking it’s the fuel filter or fuel pump. So I tested fuel pressure at the fuel rail valve. 55PSI while idling.
Once the car shuts off the pressure instantly drops. I thought the pressure was supposed to hold and bleed gradually. What does this mean? Is this a filter/pump issue or something else?
04-11-2018, 08:03 PM
#2
MBWorld Fanatic!
Start with the filter, which I believe on that car has the regulator included. If not, you need to replace whatever component has the check valve that should hold pressure.
04-12-2018, 06:16 PM
#5
MBWorld Fanatic!
Yeah it should retain some pressure for a couple hours, drop no more than 5-10 psi for 3 hours or something like that. There's a spec, but if it's dropping to zero, the check valve is bad, and that's causing the long crank while pressure builds up.
04-13-2018, 04:36 AM
#6
MBWorld Fanatic!
As ItalianJoe said start with replacing the filter. It's difficult as to location and procedure and requires a special tool to remove it.
