Question about Mercedes-Benz Cars & Trucks
Fuel pump relay is in cavity A in the rear SAM ( Signal Acquisition Module.) on the left hand side of the trunk behind a door.
When did you check the voltage..... you must read it while cranking or you will get a zero voltage reading.. The low pressure tank pump builds pressure to the high pressure pump and then shuts down until a pressure drop is sensed in the low pressure line and it then starts up again.
If rail pressure is too low, it often is the high pressure pump in the engine or the relief valve in the fuel rail. The tank pump is low pressure just to stop the tandem pump from cavitating by sucking too hard.
Mercedes can check the rail pressure and do an injector pressure drop to rule out a leaking injector.
If the tank pump is bad it will require replacement.
Posted on Nov 02, 2013
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Posted on Jan 02, 2017
SOURCE: FUEL RAIL PROBLEM
hello,fuel rail pressure sensor located at the rear end of railing tube which all high pressure line up to injector nozzle is connected, ignition off then you can remove that part,ty
Posted on Apr 26, 2009
SOURCE: low fuel rail pressure
who did a conversion on this truck???? the duramax is a common rail engine and can not handle wvo or sve. it will destroy your entire fuel system in no time on this truck. if you want to do a vo conversion you need to get a diesel with an inline injection pump or one of the older powerstrokes. i would suggest you quit trying to run wvo through this truck if you do not want to do a lot of very expensive damage
Posted on Apr 29, 2009
Find your firewall electrical junction block (where all the wires enter the cabin on the passenger side) and with a zip tie pull up the wire bundle so it does not ride on the upper tie rods and, fasten the zip tie to anything that is solid in the engine compartment and, let me know what happens
Posted on Jun 01, 2009
Possible problem with the alternator not putting out enough voltage. I had the same problem with my 2002 XC70, putting in a new alternator fixed it. I used a local mechanic who I found on the car talk web-site. Low Cost Volvo parts can be purchased at FCP Groton.
Posted on Aug 11, 2010
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