Question about 1989 Mercedes-Benz 300-Class

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Replaced fuel pump and relays. Pump buzzes, engine turns but no fuel getting to injectors?

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It might be a clogged fuel filter.

Posted on Jul 02, 2009

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Posted on Jan 02, 2017

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96 windstar eec wiring scematic


Find another relay with an identical part number(maybe the fuel pump relay)& swap it in place of the suspect EEC relay.See if the buzzing quits.If it does,the EEC relay is bad.There might be a ac WOT cutout relay or fan relay with an identical part number that you can use instead of the fuel pump relay.The fuel pump relay & EEC relay will both have to be in place in order for the engine to start.A relay should click when you turn the key on,but it shouldn't make a buzzing noise.BTW-the EEC relay is energized when you turn the key on and then it supplies ignition on power to the computer,injectors,solenoids and fuel pump relay.Therefore, if the EEC relay is defective, these components are Not going to work.If you don't hear the fuel pump prime when the key is first turned on,that's a sign the EEC relay is bad.One of the injector wires should have battery voltage, if the EEC relay is powering up.If your vehicle doesn't have a matching relay to the EEC relay(except for the fuel pump relay)just pull the FP relay out and slide it into place of the suspect EEC relay for testing purposes.If the buzzing noise stops,then replace the relay because there's no way to test if the car will start without having both relays in place.

Oct 11, 2015 | 1996 Ford Windstar

1 Answer

95 Taurus 3.8 SHO wont start replaced everything fuel pump to big relay is buzzing even new one im lost need help


Run tests. Fuel pressure correct? Spark at plugs when cranking? Fuel injector pulse working? Compression test?

Apr 06, 2015 | Cars & Trucks

2 Answers

Car is turning over but not getting fuel ideas anyone thanks


There is not much information for a good answer.
  1. Fuel filter clogged
  2. fuel pump not working [fuse,bad pump,broken wire etc]
  3. computer not telling the pump or injectors to work [should set a code]
  4. dirty injectors

Feb 09, 2015 | Cars & Trucks

1 Answer

I'M NOT GETTING FUEL TO THE INJECTORS ON A 85 CROWN VIC . THE FUEL PUMP AND THE RELAY HAVE BENN REPLACED WHATS THE NEXT STEP/


You will only get fuel at the injectors when cranking, the pump wont run(Usually) with just the key on. This is to prevent the pump running in a crash and feeding the engine.

May 18, 2014 | 1985 Ford Crown Victoria

1 Answer

Will not start will crank will start with starting fluid but when quit spraying eng quits


`Probably the fuel pump in the tank has stopped working. Verify with a check for power at the gas tank connector: When the engine is cranking, the fuel pump wire should have power on it-use a test light or voltmeter. If the wire has power, but pump will not turn on, the gas tank will have to be removed to replace the pump.
Just by turning the key to on, not start, will or should cause the fuel pump to come on for about 2 seconds to pressurize the fuel lines and put gas under pressure against the fuel injectors. If you don't hear the pump buzz on for a brief time, you know you need to check the fuel pump circuit. Check fuse, check fuel pump relay...but the easiest way to verify a bad pump is to check fuel pressure, or check for power at the gas tank when the engine is cranking. No power is a fault in the circuit (fuse, relay, wiring), power available to the pump but no pump means the pump will have to be replaced .

Oct 17, 2013 | 2001 Ford Windstar

1 Answer

2000 mercury grand marquis 4.6 Intermittent problem. 35,000. miles. Problem engine died several times wile driving. Also after car is parked from a drive will not start. Found that the fuel pump is not...


I'd have to test when problem is ongoing. When you first turn on key, no crank, you should hear the pump run for a few seconds then stop. For initial prime, the computer doesn't need rpm signal. Engine cranking, the computer needs to see rpm signal or it won't ground the fuel pump relay. W/o rpm signal, no spark at the plugs and no fuel injector pulse. I know your talking about fuel, but, when problem is ongoing, check spark and fuel injector pulse, engine cranking.
Intermittent problems are a pain, have to test when problem is ongoing.
mercury fuel pump-i4kx0gxqalhdz4ok10irisui-5-0.jpg

Feb 27, 2017 | 2006 Mercury Grand Marquis

1 Answer

How can you tell if your fuel relay is bad


Most vehicles have a "system prime" that occurs when the ignition key is moved to the "ON" position. This is where the key ends up after you start the engine. This prime runs the fuel pump a second or two to get the fuel pressure high enough for the injectors to work once you crank the engine. The prime is performed by the fuel pump relay. In a quiet area (minimal noise, no radio), sit in the vehicle and turn the key to the on position without cranking the engine. You sgould hear a 3-5 second buzz or hum. This is the fuel pump coming up to pressure. If this is not occurring, then either the relay or the pump is most likely bad.

Nov 13, 2011 | 1997 Chevrolet Blazer

1 Answer

Injector not working why put new injector new computer new fuel pump does it have injector relay 1987 celebrity


Check fuel pressure. Have you replaced the fuel filter on schedule? Verify that the fuel pump is getting power. Power goes through an in-line fuse, then the fuel pump relay or the oil pressure sensor. (The relay bypasses the oil pressure sensor while the engine starts, but fuel pump power goes through the sensor during normal run operation. If you lose oil pressure, the fuel pump is shut off to protect the engine.) On four-cylinder models, the fuse is in the fuse block (E PUMP 10)
The fuel injectors are connected to the ECM fuse on one side and straight to the engine computer on the other side. Check the connectors and wiring, especially at the injector.

Aug 26, 2011 | 1987 Chevrolet Celebrity

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

I replaced the battery, how do I reset the computer, its not getting fuel?


Thanks for choosing FixYa Michelle and welcome to the site. Anytime the battery is off, the computer resets automatically. Since you are not getting fuel to the engine, you need to make sure that the fuel pump is working. Check your fuel pump fuse and relay. Also, check the reset button if you have one. You should be able to hear the pump kick on when you first turn the key on. You should hear a buzzing sound for a second or two. If you don't, check the fuse/relay. Check the reset button if you have one. I am not sure if you do or not Michelle. They are usually in the glove box if you do. If you check all them and the pump still doesn't work, change it. Now, you need to check your fuel filter as well. It may be clogged. If not, check your gas lines. Make sure that none of them are damaged. If not, the only thing left to check is your fuel injectors. That is your complete fuel system there. Check the fuel pump, fuel filter, gas lines, and the fuel injectors. If you are not getting gas, it is one of them.

Apr 24, 2011 | 2001 Ford Mustang

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