Question about Mercedes-Benz S-Class
FUEL PUMP PRESSURE
Posted by Anonymous on
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Posted on Jan 02, 2017
If you are checking before the pressure at the fuel line in the engine bay, then it is possible that the filter may also be an issue. In most instances, the filter is somewhere along the fuel line from the tank and would be underneath the car's trunk. In some cases the filter would be inside the tank together with the pump.
If at the tank's outlet the pressure is relatively low, then as you posted, it could be the fuel pump which is inside the tank. It is also possible that dirt, sand, debris may be blocking the inlet port of the pump, try banging on the tank to agitate with the pump off. Cleaning/replacing the fuel pump would of course necessitate tank removal.
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Posted on Jun 09, 2008
When you hook the pressure test guage to shrader valve on fuel rail what it reads is what the pressure is from pump, around 60 p.s.i. all you need to do is hook up the guage and turn on key, you do not have to turn engine over, and if pump is good it will shoot up to 58 or 60 right now.
Posted on Feb 14, 2009
the fuel pressure if leaking could cause this the regulator is located under the intake plenum but you should smell gas .if you dont then most likely the pump is bad ,the pump will come on for 2 seconds when the key is on then go off it will not stay on with just the key on only when you crank it will it .so have your fuel pressure checked with a gauge.
Posted on Mar 22, 2009
From 53 reg onwards, diesel pump is under R.H. rear wheel arch, hidden by the plastic wheel arch liner. Older versions have combined fuel pump/sender in the tank (under R.H part of rear seat).
You should be able to hear a faint purr from the pump when ignition is turned on but engine not yet running.
Posted on Nov 15, 2009
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