Question about 1996 Mercedes-Benz C-Class

1 Answer

There is no electricity coming to the fuel pump on my 69 280 SE sedan. When I run a hot wire to the pump, the engine starts and runs nicely. Where do I look for a bad connection or bad relay. Where does the juice to the pump come from? Thanks. John

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert who has answered 20 questions.


    An expert that hasĀ over 10 points.


    An expert whose answer gotĀ voted for 2 times.

  • Contributor
  • 61 Answers

Sounds like you need a wiring diagram-check all ur fuses-pump might be pulling too many amps and blew fuse-might need new fuel pump buddy-if you find a blown fuse-replace pump,relay,filter and fuse

Posted on Aug 10, 2008

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Car ran completly out of gas now it wont start

GM vehicles do not like to be run low on gas. I'm willing to bet that the fuel pump is bad. Fuel is what keeps the pump cool. No fuel equals a hot pump and it doesn't take much to burn them up. What you can do. 1. Verify there is no fuel pressure. 2. Make sure there is power to the fuel pump (the larger grey wire is the power supply to the pump). 3. Using a rubber mallet whack the center of the fuel tank while a helper turns the engine over. If it starts reach the pump. You only get one get out of jail free card with that trick.

Sep 07, 2013 | 2001 Pontiac Grand Am SE

2 Answers

How do u know if a fuel pump is bad

Does it run at all
Have proper fuel pressure
Have proper fuel volume
Have correct Current Draw
Look at Scope Pattern on pump motor
Does it hold pressure when turned off

If it is over ten years old, it is about worn out
It is just a small motor with an armature & bushings

It can fail mechanically or electrically

If you run the tank low on fuel they burn out

Mar 01, 2013 | 1989 Cadillac Sedan DeVille

1 Answer

Im working on a 1986 toyota pickup 2.4l efi non turbo 4x4 i replaced the head gasket and i have a black wire coming from the intake wiring harness that has no plug on it .if i touch this wire to a hot wire...

Sounds like this wire should operate the electric fuel pump through the fuel pump relay.The fuel pump relay should start the fuel pump to maintain fuel supply to the common fuel rail and any surplus fuel will be bleed back to tank by pressure control.The injector opening sequence is contolled by computer once the engine is properly timed.
If you say the engine runs for a few seconds it would indicate fuel pump or relay is not getting power to operate or fuel pump is not delivering enough pressure to feed the injectors

Apr 29, 2011 | 1986 Toyota Pickup 4WD

1 Answer

How to hot wire 2001 grand am fuel pumo

  1. why would you want to hot wire it?
  2. fuel pump is controlled through the fuel pump relay
  3. relay is controlled by the computer
  4. if oil press is low or if the computer doesnot see an ignition pulse it will turn off the relay.
  5. this is safety concern if the car is in an accident causing the engine to stall a bypass will allow the pump to run creating a poss fire hazard.
  7. jumper fuel pump relay connections
  8. carefull jumper the wrong terminals and you may fry to computer.
  9. obtain wiring diagram first

Aug 22, 2010 | 2001 Pontiac Grand Am SE

1 Answer

Passat SE 2.0 TDI - Engine Management Fault

oh dear,,your not going to like me at all now?????
its the engines fuel pump,,,they have a hight presher pump fitted this is what they do just before they pack up,,,you could try changing all the derv filters first but dont go holding your breath its going to help you get the car running right,

Mar 07, 2010 | 2007 Volkswagen Passat Sedan

4 Answers

OK i have a 1999 gmc Yukon i just changed the fuel pump spark plugs ing coil control module wires but she still wont crank she starts then shuts off whats wrong HEPL ME PLZ

I suppose that you mean it starts but doesn't continue to run. And if you try to start it right away it'll just crank. The fuel pump is on in crank but not in run ( maybe ). Find the fuel pump relay in the underhood fuse relay panel and use a test light to cheak the pins for power and ground. First with the test light hooked to a good ground, check to see if it works first ( touch the battery positive ) then touch all the pins of the relay ( removed ) One should be hot all the time ( if not the fuel pump fuse is blown) another should be hot with the key on. one of the others will be hot only in crank ( this is the fuel pump) The last other is ground with the engine running after started. The one thats hot in crank put power to it with a jumper wire and start the engine ( it'll run ) the fuel pump also gets turned on by the oil pressure switch and the fuel pump fuse is blown it'll also not run the engine. But it'll run right after it's cranked and quit

Nov 14, 2009 | GMC Yukon Cars & Trucks

3 Answers

2001 Dodge Ram 2500 HO Cummins 6 Speed

TAKE IT TO A MECHANIC !!!!!!!!!!!!!!

May 31, 2009 | 2001 Dodge Ram 2500 Truck

1 Answer

93 merc topaz feul pump wiring harness question

The engine computer turns on the fuel pump for 3 seconds when you turn the key to "ON".
If the engine does not start, the pump will not run.
When you turn the key to "Start", the fuel pump runs all the time the key is held in start.
When you turn the key on, it actiavtes the power relay, which provides power to the PCM or engine computer.
The PCM then activates the fuel pump relay, sending power to the fuel pump.
You should have one wire with 12V for 3 seconds in "run" position. This comes from the fuel pump relay to the inertia switch in the trunk and then to the fuel pump.
You should have one ground wire. black
One wire going to the fuel guage.
You may have another ground iwre ging to a diode before going to ground.

Mar 30, 2009 | 1993 Mercury Topaz

5 Answers


It may be the fuel pump, if its not getting gas it won't start. If not that it could be electrical

Jul 20, 2008 | 1994 Cadillac DeVille

Not finding what you are looking for?
1996 Mercedes-Benz C-Class Logo

169 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mercedes-Benz Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22059 Answers


Level 3 Expert

71338 Answers

Michael Contreras
Michael Contreras

Level 2 Expert

166 Answers

Are you a Mercedes-Benz Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides