There's a loud humming noise eminating from the rear in the general area of the fuel tank or left side near the rear wheel. Possible fuel pump? When I use the power windows or top, the noise sounds as if the electrical system is straining to provide enough power. Runs great - no other issues. Any ideas? Thanks!
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Re: 1998 Cabriolet 2.8 electrical noise
Have you checked the operating motor for the soft top?....It sounds very much like you may have a relay problem with the cut off control for that motor....have a good look and make sure that there's nothing fouling the operation of the unit...
The pump is probably an immersible type, which will then be mounted inside the tank....If it external, it still carries the fuel..... I would hope that you don't have a problem with that, as if it is working under high load, it would be over heating and that could be very dangerous..... Have it checked very quickly.... Once you're satisfied that it is NOT the pump....Take a friend with you and ask for that person to listen for the direction that the sound is emitted.....Also carry a rubber pipe and using it, your friend will be able to pinpoint the noise.... Once you know the place, you'll be able to identify the defective unit and take the relevant action.
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A SAFETY FUEL SHUT OF SWITCH IS GENERALLY LOCATED IN THE REAR OF THE VEHICLE NEAR THE GAS TANK, TRUNK AREA, OR REAR CARGO AREA. THIS IS BECAUSE IF A REAR END COLLISION OCCURS...THIS SWITCH WILL TRIP, STOPPING FUEL FLOW TO PREVENT FIRE AND/OR EXPLOSION
unhook battery, remove all gas,jack rear of car up and always use safety stands, unhook straps that hold the tank in place,be careful with fuel lines, fuel pump is on the top of tank, there is a locking ring on the pump, remove it and replace.
Often "humming" noises like what you are experiencing are caused by a failing bearing somewhere. Some usual suspects are wheel bearings, alternator bearings, and sometimes even your waterpump, but usually it starts leaking too. To start narrowing down what it is, have someone ride with you to see if the noise is coming from left side or right side, or engine area, then see if it happens when the car is not moving, or just when the drive wheels are pulling the car? This way , hopefully you can pin point the culprit!
fuel pump noises vary from model to model however, it should be a smoth humming or steady sound at idle not a grinding or pulsing sound. A inexpensive way to improve your fuel system is to replace the fuel filter. This is relatively inexpensive and can save wear and tear on your fuel pump. Remember, if you do replace a fuel pump always replace the fuel filter and make sure that you replace the fuel strainer. A plugged fuel filter can quickly ruin a fuel pump. I also recommend flushing the fuel tank if the old fuel strainer has more than very small amounts of rust or dirt.
The humming noise is coming from the fuel pump. Its possible its getting ready to fail. These start making noise when they are going bad. The smell can be coming from bad gas cap not sealing up fuel tank properly and or a fuel pump/sending unit seal. You can pull the back seat bottom out easy enough by removing 2 5mm alan screws that secure it to the floor. Remove the seat bottom buy pulling out and remove black cover under seat bottom that has 3 philips screws. you may smell fuel more promanently here.