There is not much to go on here from your description but I will give you the basics on where to start, Check the fuse to the fuel pump, check the fuel filter, if your not getting fuel to the engine it has to be either the pump or the filter. unfortunatly the fuel pump is in the gas tank o checking it is a little more difficult. Have someone turn the key on and get under the car next to the fuel tank and listen to see if you hear any humming noises. the noise should tell you your pump is running or at least trying to run and this will let you know if it is a electrical issue. if the pump is running and still no fuel, change the filter. you can also have someone turn the key on while you have the filter off and see if any gas is coming through the line, if no gas then the pump is not working or bad one of the two. I think too many people forget about this and it is straight forward and a good preventative maintenance. From my experience if it hasn't been changed by 40-50 K get it changed. You're just asking for fuel pump problems. The more restriction there is in the fuel path the harder that pump works to push fuel. It's located just under the
driver's seat on the frame rail.
You will need a 13mm socket/wrench, and a flat screwdriver to undo the supporting bracket/clamp respectively. A special tool is required on most models to release the fuel line; however, it is relatively cheap and can be obtained at your local parts store. It is used like a quick-disconnect to undo the fuel line.
Once disconnected the new filter is just snapped on the line with ease and the safety clips can be reinstalled and thus the filter remounted. Interestingly, take your old filter and turn it opposite of the fuel flow and empty it in a coffee can. To see just how plugged it was getting, try blowing backwards on the filter and you can see a lot of the sediment come out in the can
The real key to removing the special fittings from the
fuel filter
is the technique employed using the special fitting removal tool. Once the fuel pressure has been relieved and the filter mounting bracket and band clamp have been loosened and moved out of the way, proceed as follows:
Remove the lock clips that are placed over the fuel filter tubing and the fittings. They should come off without having to use excessive force. A small screwdriver inserted into the open end of the clip at the fitting end can serve as extra leverage if needed to get the clip off.
Grasp the fuel filter in one hand and one of the fittings in the other. Try gently moving the fitting back and forth while it is still in place. Notice that there is about 1/8" to 3/16" worth of movement. Pull gently until the fitting is all the way back as far as it will move. Clip the special fitting removal tool (the tool should be designed to work with 3/8" fuel lines) over the fuel filter tubing. Now push the fuel line fitting towards the tool as far as it will go. While still holding the fitting in, use your pointer and index fingers on the same hand holding the fitting to pull the fitting removal tool "into" the fitting itself as far as it will go (the tool should "bottom"). Still grasping the fitting and tool together, pull them back in the direction for removal, keeping the tool inserted in the fitting (important). At some point, the tool will stop as it hits the fitting retainer "nub" on the filter tubing. Keep the tool pressed against the retainer nub (use ! ! your other hand now for this) and continue pulling the fitting off of the tubing. It should come off with only a few pounds of force. Repeat the procedure for the other fitting.
It is important to push the fitting in towards the filter to engage the fitting removal tool as this relieves the tension on the "fingers" prior to insertion of the tool. If you don't push the fitting all the way towards the filter first, the tool will not release the retainer spring and you won't be able to pull the fittings off. This is the mistake that I made repeatedly the first time I tried changing the filter in my vehicle. Don't use the tool to try and "pull" the fitting off with - it isn't supposed to work that way.
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The air intake is behing the radiator on320d.
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