Question about 1994 Mercedes-Benz C-Class

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I NEED ELECTRICAL WIRING DIAGRAM FOR C 180

FUEL PUMP DOESNT WORK

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Have you checked the fuel pump relay in the boot lift the carpet up where the spair tyer goes ther is a big green relay i think it green thats the one that runs the fuel pump check this first if thats ok it will be the fuel pump itself there about 28 pounds ish on ebay for new pump hoe this helps ivan

Posted on Nov 20, 2013

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Posted on Jan 02, 2017

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No ,you don't need to reprogram the computer . You need to learn how to test automotive electrical circuit's ! Do you know what a relay is an how it works ? Supplying B+ at the fuel pump relay to see if the fuel pump electrical circuit is intact back to the fuel pump.Do you know what a wiring diagram is ? True the ECM - engine computer energizes the fuel pump relay to turn on the fuel pump , but wiring has to be good . Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info. Year , make , model an engine size. Under system click on engine , then under subsystem click on fuel controls . Click the search button then the blue link. Looking at the first diagram in the middle of the page you will see the fuel pump relay . Looking down a little bit you see the fuel pump . Look at the connectors an the ground - do you know what ground is or earth ? High resistance can cause problems .
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Doesn't have one . Looking at a wiring diagram to view fuel pump electrical circuit would show that . Do you know what automotive electrical wiring diagrams are ? Do you know how to use one along with a DMM - digital multi-meter to test electrical circuit's ? The fuel pump is controlled by the PCM - engine computer by energizing the fuel pump relay .
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Enter vehicle info. year , make , model ! Under system click on engine ,then under subsystem click on fuel controls . Click the search button then the blue link. Scroll down to the fifth diagram .Fuel pump electrical circuit .
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I'm looking for an electric fuel pump wiring diagram for my 2001 Chevy Silverado 4.8L engine. I need to probe the harness plug at the fuel pump to determine if it is a voltage supply problem or the pr


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give current to grey wire to fuel pump and listen if fuel pump work
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Did you check fuel pump electrical circuit ? Look at a wiring diagram to see what all is involved in making the fuel pump work. No , the knock sensor can't cause this ! Do you know how to do automotive electrical circuit testing using a DVOM - digital volt ohm meter ? How to read an use a wiring diagram to pin point areas for testing in a electrical circuit ! What do you think makes that fuel pump work ? AIR !!!! Looking at a wiring diagram I see a fuel pump relay that gets B+ voltage from the engine control relay. The engine computer energizes both, relays .There is a fuel pump resistor inline before the fuel pump.
Free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model and engine size. Under system click on engine then under subsystem click fuel controls ! Click the search button then the second blue link . The second diagram down shows the fuel pump electrical circuit .
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Rather then guessing as to what the problem is learn to test ! Check the electrical circuit , hook up a fuel pressure gauge , use a spark tester to see if it has spark . Do you like buying parts you don't need ? Other wise your better off having a qualified repair shop check it out .
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Test the fuel pump relay ,do you know what a relay is and how it works ? Ford fuel pump electrical analysis begins at 8 mins into the video .
Do you know what a wiring diagram is ? Free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model and engine size. Under system click on engine ,then under subsystem click on fuel controls . Click the search button ,then the blue link . scroll down to diagram # 7 ,this fuel pump electrical circuit .

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1994 ford ranger xlt 2.3l. having trouble with the fuel delivery system. pump doesnt prime or cut on at all ( itll jus quit when im driving) but mostly when i slow down to a complete stop my truck will...


Rather then just replacing parts testing the fuel pump electrical circuit is the proper way to diagnose . Do you know how to use a DVOM - digital volt ohm meter , how to use a wiring diagram to pin point testing points in a electrical circuit ? How to use voltage drop testing in a circuit to find which part of the circuit has the problem B+ or ground side . Yes it can be very agrivating if you don't know what your doing . Testing for power at the relay an testing for control . The PCM - engine computer controls the fuel pump relay !
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Do you know what a wiring diagram is , how to read an use one to pin point loactions in a electrical circuit for testing purposes .

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