Question about Mercedes-Benz ML320

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I have a 2001 ml320 and takes a least two to three attemps to get it to turn over, i've changed the fuel pump as well as the fuel filter, what else could cause this to happen?

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To turn over or start? I would suggest crank position sensor as it is a reoccuring pproblem which sends no fault to the engine computer.

Posted on Aug 15, 2010

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99 f150 6cyl the problem started with it cutting out when i would take off or try to accelerate, then while driving it will judt die and now it won't even start without me spraying some starting...


just because the fuel pump clicks when u turn the key doesnt mean its not going bad, have you had it changed, or the fuel filter changed since u purchased the vehicle?

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Oldsmobile alero intermittant prime


The way the system works is fairly simple.
The computer grounds the pump relay for 3 or 4 seconds when the key switch is turned on. If the engine does not produce oil pressure the pump power is cut.
If you have changed the relay and the problem persists, I would expect the problem to be in the computer.
The pass key system prevents the starter and fuel injectors from working. I don't think it controls the fuel pump relay.
Did you mean to say you had to wait 10 min before turning the key switch on a second time, or did you leave the key switch on for 10 min ?
You could probably use a low voltage tester or VOM to check the signal from the ECM, but the tool you use may cause the relay to come on in place of the signal.
The other three circuits are power from the battery, power from the key switch, and the line out to the pump. One of those could be faulty, especially the one from the key switch. But other things should be not coming on too if that were true.

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2001 grand am fuel pump runs but I only get fuel sometimes. Fuel pump going bad? Or losing prime somehwere? May have run fuel lines dry


Install a fuel pressure gauge on the rail and turn the ignition key from OFF to ON, so you can hear the fuel pump run. Do this about three times, then check your pressure. Check for drain-back.

You could have a clogged fuel-filter, but if it has been clogged for some time, its possible that it strained the fuel pump and could have damaged the fuel pump as well. If you have low pressure, I would suggest changing the fuel filter first to see if it improves. You may find that you need to change both. If the fuel pressure drops rapidly after turning the key off, you have an issue with the check valve in the fuel pump, and the assembly will need to be changed.

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The fuel filter is integrated into the fuel pump, inside the fuel tank.
Spark plugs are easy.

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Truck stopped running as I was driving and won't attemp to cranck.


wont turn over or wont start, if it wont turn over your alternator probably came unpluged or went out then drained your battery, if it turns over but wont start you lost the timing chain

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fuel pump is obviouslynot working !
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Could be failed fuel pump. Disconnect fuel line at engine and turn over a couple times having something to catch gas in. If electric pump don't turn over engine, just turn key to run position for a few seconds. Maybe clogged fuel filter or faulty pump if no gas shows. Change fuel filter and try again. If none, change pump.

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The filter is located at the rear seat, you have to remove it first, then you will see a cap attach with some screws. Inside that cap you`ll find the fuel filter. Before you change the fuel filter you have to release the fuel pressure first. To do that, first find the FUEL PUMP RELAY in the main fuse box located in the engine. Once you located open the fuel door and take off the cap and leave it open. Start the engine, take off the FUEL PUMP RELAY and leave the engine stop itself, when this occurs turn off the key, the you can take off the filter and changed it

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