Question about Mercedes-Benz 300-Class

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1990 mercedes 300se turns over but won't start. Fuel pump is working and motor seems to be getting fuel.

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Hello,you have 6 cylinder engine,fuel pump is working,how about the fuel pressure? if pressure is ok,try to clean the distributor cap and rotor ,try to start your engine if not remove your plug,check your plug ,if fuel is presence ,check your ignition system,or vise versa,ty

Posted on Apr 20, 2009

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most likely you have a bad crank sensor or fuel problem you need to check fuel pressure ,if you have enough pressure ,most likely you need crank position sensor,if you don`t have fuel pressure ,it might be your fuel pump relay or the pump, i would start with the relay first very unexpensive. you can also hear the pump if it`s working by cranking the engine and listening rear of the car for a humming sound .
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Make shure the RPM meter is working. If this signal from the ignition control unit is missing the fuel pump will turn off the fuel pump after some seconds.

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Yes try the fuel pump relay first, jumping it will tell you whether or not the pump is working. Though you should hear it turn on ( the fuel pump that is) turn you turn the key to the 'on' position.

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This car has a pretty reliable inline 6 cyl. The car also has TWO fuel pumps .. if one pump is bad the car will not produce full power. this is to keep you from being stranded if you have a fuel pump failure. What you really need to do is check the fuel pressure and see if thats up to spec. Check your air filter too.. Do you have black smoke when you step on the gas? or just poor power. ?

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1 Answer

My 1989 300se will turn over but not fire I cannot hear the fuel pump is there a fuse or is it time to replace


There is a fuel pump relay with fuse under the screwed down cover area connected to where the fuses are. I would guess you fuel pump is out though due to age and use. It was probably very loud if you could actually hear it before and then they just die. Try autohausaz.com for some of the best prices I have seen. Remember to get the check valve and fuel filter also. You can "hot wire" the pump to see if it turns on but I wouldnt suggest it.

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1 Answer

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hello,good day,first we are in fuel side,better to install a fuel gauge,to determine the right pressure, is not mention your fuel pump relay,this should also check,some occasion the power supply is missing,now if all is in order (fuel side) then your switching unit(transistor box) need tobe check,assuming your engine is 103 engine,ty

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I know it's a little large, but here's the belt routing diagram you are looking for. Hope it helps!

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