Question about 1988 Mercedes-Benz 190

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No power to the fuel pump, replaced crank sensor, fuse on the relay has power, replaced fuel pump, isolated fuel pump ran separate power to the pump car will run fine but no power to the fuel pump wires under the car.what are we missing

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Hi

Thanks for using FixYa. Please check the fuel pump connections. Also check the connecting wires from the fuel pump to the battery. Make sure the connections are not loose. Make sure that the fuel pump relay is connected firmly. Try changing the fuel pump relay as these go bad very easily.

Please do accept the solution if the issue is resolved or else revert for further assistance.

Thanks
Rylee

Posted on Sep 08, 2009

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the fuel pump throttle is stuck. --------------

  1. If there is no power, the problem is either in the ignition switch or the security system. If the security system is activated it will turn the power off to the relay so the car cannot be started. If there is power, turn the knob on the voltmeter to OHMS and turn the key off. Remember which terminals were hot, if not retest and memorize these terminals. Use the ohmmeter to test for continuity to ground on the two remaining terminals.
  2. The terminal that does not go to ground will go to the fuel pump. Using the jumper wire, jump the terminal that was hot all the time to the terminal that was not a ground. The fuel pump should come on. If you cannot hear the fuel pump come on, open the gas cap and listen for the pump. If the pump is not working the pump itself--or possibly the wiring is bad, though it is not likely that the wiring is bad. With the jumper in place, jack the car up enough to get under the gas tank and pull the fuel pump connector at the back of the tank and check for power. If the fuel pump is working replace the relay.but as per you you have replaced the relay.so it can be the faulty wiring.try checking the wiring from both the ends.through meter.
  3. We are all aware that the fuel is what makes your engine run. But how can the fuel provide the needed power if it has no fuel-sending unit? This is where the fuel pump comes into use. The fuel pump is what sends the fuel through the steel lines to the fuel filter. So, for your Mercedes Benz car having a good set of fuel pump is essential for a good running engine.

    Generally, cars that use carburetors have a mechanical fuel pump. This mechanical fuel pump is mounted on the engine block and is driven by the camshaft. However, most cars nowadays use the electric fuel pump. This is because of the widespread application of fuel injection and its need for higher pressures. Electric pumps are usually mounted inside the fuel tank but there are cars where the pump is located at the frame channel. One advantage of the electric fuel pump is that is has its own electrical control unit. This circuit, which is typically composed of wires, relay and fuses, interacts with the vehicle’s powertrain control to govern and monitor fuel pump operation.

    When there is disruption in the electric current that hinders with the pressure your Mercedes Benz fuel pump may fail. Keep in mind that a contaminated fuel pump can take the toll on your car’s life. Keeping your tank full at all times can help protect the pump. This is because having plenty of fuel in the tank helps keep the pump from getting too warm. Since too much heat can damage your pump keeping it full can reduce the heat and keep it cool. Additionally, a full tank can help reduce the chances of sediment pick-up at the fuel pump inlet strainer.

    Once you see that there is something wrong with your fuel pump do not ignore it. Remember that it always pay to address any problem as soon as possible. Symptoms of a broken or faulty fuel pump includes stalling, hesitation, poor performance and a loud pump whine. If when you attempt to accelerate your car hesitates or bucks or if it takes you forever to starts your vehicle, it is time to have it checked out by a qualified service mechanic immediately. If you are replacing your fuel pump consider replacing your fuel pump relay and oil pump switch as well since these parts are located in the same area and will likely deteriorate at the same rate.

    Get your high performing Mercedes Benz fuel pump from Parts Train. Aside from design and quality concerns, we see to it that our Mercedes Benz car parts are safe to use and high performing. Browse through our catalog now and get that fuel pump that can give the engine power that you want.
http://www.partstrain.com/ShopByDepartment/Fuel_Pump/MERCEDES_BENZ click this link for parts. thanks.keep updated.

Posted on Sep 08, 2009

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