Question about Mercedes-Benz ML320

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My car keep cutting out every time i reached 85 degre just change the fuel pump and the fuel pump relay and will not start untill the engine get cool i have put some xred to my thank to clean the injectors but still have the problem took the car to electrical place could not spot the problem

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That stuf u put in tank dont work-must hav each injector pro cleaned-$30piece--du a scan to find any bad codes--on older vehicles some electrics stop workin from heat

Posted on Sep 04, 2010


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I installed a fule pump and started right up, and then stopped runing again, I was going to clean fuel filter, and fuel kept flowing throuule the fuel line. I changed fuel pump relay five times, I...

Maybe the oil pressure sensor or switch that keeps the pump running after engine started.

If you jumped 87 and 30, it should have turned the pump on. If those are the right terminals at the fuel pump relay, and I think they are. Those are usually the right ones.
Try this: one of those terminals should be hot at all times, the feed for the fuel pump. Check for a hot terminal there. If the feed for the pump is lost, it will probably be a blown maxi fuse or fusible link supplying that relay's power feed.
If it still starts and dies, check the fuel pressure. If pressure is at specification, both key on, engine off and with engine running, it could be an ignition problem (crank sensor?), not a fuel problem. But you may be right to pursue the oil pressure switch or the pcm, if the pump was still running as you say at the fuel filter .

At terminals 85 and 86 of the pump relay, you could check for the computer signal on one of those with the engine cranking. With engine cranking, the computer sends a signal to the coil side of the relay, either the 85 or 86 terminal, and the other terminal will go to ground. Do you have a test light or voltmeter?

Apr 26, 2014 | 2002 GMC Sonoma Extended Cab

2 Answers

I have a 98 jimmy.4dr, 4wd..problem --no power to fuel pump....if you stand on drivers side looking at fuse panel (the top right pin of the relay has power, but thats the only one...if i jump power to the...

Fuel Pump Electrical Circuit
When the key is turned ON with out the engine running, the control module turns a fuel pump relay ON for two seconds. This builds up fuel pressure quickly. If the engine is not started within two seconds, the control module shuts the fuel pump OFF and waits until the engine starts. As soon as the engine is cranked, the control module turns the relay ON and runs the fuel pump.
When the engine is cranking or running, the control module receives the Crankshaft Position (CKP) sensor reference pulses which in turn energize the fuel injectors. As a back-up system to the fuel pump relay, the fuel pump can also be turned ON by a fuel pump oil pressure switch. When the
engine reaches about 28 kPa (4 psi), and the fuel pump relay does not complete the circuit, the fuel pump oil pressure switch will close to complete the circuit to run the fuel pump.

An inoperative fuel pump relay can result in long cranking times, particularly if the engine is cold. The fuel pump oil pressure switch will turn ON the fuel pump as soon as oil pressure reaches about 28 kPa (4 psi).

You can test to see if the relay it's self is bad by swapping it temporarily with another relay. If your truck has AC then that one should be compatible. Just compare the two to see if they're the same and if so, try using the AC's relay.

Apr 05, 2011 | GMC Jimmy Cars & Trucks

1 Answer

Gas not getting to engineto keep it running


May 22, 2010 | 1995 Ford Windstar

2 Answers

Ive got a 1997 cavalier it will start but quickly dies out ive got fire to my plugs and fuel to the injectures ive just replaced the ignition switch is there somkind of a security

You need a new fuel pump relay. The engine fires up and runs off the oil pressure switch untill the oil pressure PSI is reached at normal operating conditions. When the oil pressure reaches its operating PSI the PCM or engines computer will shut off that circuit and turns on the fuel pump relay to run the fuel pump untill you shut the engine off

Apr 19, 2010 | 1997 Chevrolet Cavalier

1 Answer

My car turns over starts then cuts off

The fuel pump operates off two items upon starting the car. When you first turn the key to the ON position you can hear the fuel pump faintly running inside the fuel tank. If you can not hear it it seems it is working for you stated the engine starts then cuts off. That tells me the engines oil pressure switch is working the fuel pump. On the oil pressure switch this switch has a third wire which is directed to the fuel pump. When the engine reaches full oil pressure the computer shuts off the signal from the oil pressure switch and then the computer turns on the fuel pump relay which stays on until you shut the engine off. I do beleive the fuel pump relay is what you need for it is not working no longer. This will have many relays with the same part number on it. You can easily swap any relay that looks the same with the same numbers on it and try it once to see if the engine stays running.

Apr 09, 2010 | 1990 Oldsmobile Cutlass Supreme Conv

1 Answer

Have 1989 toyota 4 runner with v 6 engine the only way it will get enough power to the fuel pump to run truck is to take the relays out and put them back then the truck will run until you get where you are...

the pump relay is controlled by the fuel pressure regulator
it cuts power to the relay when fuel pressure is maintained
check ti for correct operation

Apr 01, 2017 | 1986 Toyota 4Runner

3 Answers

Where is the fuel relay located in Mazda mx6 1988?

On that one it actually called circuit opening relay under left side of dash in fuse relay box


Feb 08, 2010 | 1988 Mazda MX-6

1 Answer

Car starts and cuts out after 2 to 3 seconds. fuel

When the ignition switch is turned on the pcm turns on the fuel pump by energizing the fuel pump relay. The PCM keeps the fuel pump on as long as the engine is cranking over or running.It does this by recieving pulses from the ignition module. If there are no referance pulses the PCM will turn the fuel pump relay off in 2 seconds with the ingnition on.

Most models also include a secondary control path through the oil presure switch witch will turn the fuel pump on after it detects oil presure.cranking time will be longer if the fuel pump doesn't recieve current until oil presure switch contact is closed.

Jan 28, 2010 | 1998 Chevrolet K2500

1 Answer

Engine turns over,but no fuel pressure at relief valve.

Check the fuse to the fuel pump.
The issue is repeated blowing of the fuel pump fuse. This occurs randomly and without warning, normally when medium to high throttle is applied. Generally the RPM's will fluctuate briefly before the fuse blows, which cuts off ALL power to the vehicle.
Especially dangerous on a highway! The first mechanic found a TSB related to the fuel pump resistor, and its default location in the wheel well can cause premature corrosion. Replaced it and relocated as per the TSB.
You can bypass the resistor, it's simple and free. You bend pin 85 on the fuel pump relay #15, in your engine bay fuse and relay box. Good luck and keep me posted, at worst ti's going to be a bad fuel pump and your going to have to drop the gas tank to replace the fuel pump. When you bend the #85 pin from the relay, will set the fuel pump on high mode bypassing the resistor.

Dec 22, 2009 | 2004 Pontiac Grand Prix

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