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The indicator you see is call a water in fuel warning lamp.
This a very important warning and you will need to take corrective action ASAP.
As a diesel owner,you need to know diesel fuel can attract moisture. When condensation (water droplets) collect inside the fuel tank,it will contaminate the diesel.
The corrective action is to locate the drain **** on the fuel filter and CAREFULLY drain the water from the bottom of the filter housing. (with engine off / key out)
The water in fuel warning light will go off as soon as the water is drained.
Use one bottle of RED Iso-Heet to remove any additional water inside the fuel tank.
i had the same problem with my f250 diesel, i had got all the filters changed, and it still came on, the drain plug was stripped so i took it to a dealer, they ordered a new housing and gasket, and i niticed they changed the wiring harness for it, was an updated one , so i suspect you need to replace the harness , aprox 30 bucks, and the housing was aprox 220 dollars if it needs replacing.
hydraulic tappets by the sound of it ,three squirts of fairy liquid into engine oil and some diesel say about half a pint then run engine for a couple of days then when noise stops change the oil and filter ,if oil hasnt been changed for ages then when hot and ready to change add some more diesel say a litre then let engine idle for ten minutes and then drop oil .then change oil every 6000 miles with a oil filter every thrid oil change ,Use the cheapest oil you can buy say a 10/40 but even a monograde of 30 or 40 will do ,do not use expensive long life oil as it just causes the engine to clagg up inside bolcking the oil ways causing this sort of problem ,if in the uk then shell rotella is a reasonable priced oil and its a good oil
Changing the fuel filter on a gasoline Jetta is NOT included as a routine service. Which may be good news for you (i.e. they don't need to be changed). Any reputable VW technician will recommend changing the filter between 60 and 80,000 miles, as a precaution.
yes, on engine.base part #9155, Item #40, big round thing in picture
SECTION 303-04C: Fuel Charging and Controls — 7.3L Diesel
2000 F-Super Duty/Excursion/Motorhome Chassis Workshop Manual
DESCRIPTION AND OPERATION
Fuel Charging And Controls
The fuel system used on the 7.3L direct injection (DI) turbo diesel engine is controlled by the powertrain control module (PCM) (12A650).
The fuel system components consist of:
Should be mounted the same as a 2005. On the inner fender, above the right-hand wheel arch, in front of the windshield washer tank. Pull the retaining clip that secures the control valve to the top of the filter assembly. Pull up the control valve and its hoses, away from the filter. (1) To drain water out of filter: At the bottom of the fuel filter, loosen the drain plug, while holding a container underneath the filter to catch the diesel fuel and water. When you have drained the water, and diesel fuel is now draining -- stop! Twist the drain plug closed, pour a few ounces of fresh diesel fuel in the top of the filter. Use a new O-ring when reattaching the control valve to the filter top. When the vehicle is running, check for any leaks. (2) To replace the fuel filter: start where #1 above begins, disconnect the fuel control valve from the top of the filter; mark the other two fuel lines with tape and disconnect them (they may be attached with spring clamps that you will need to cut -- replace them with screw-type fasteners, see instructions below); remove the fasteners and take the filter and mounting bracket from the vehicle. Loosen the bracket and remove the filter. Fill a new filter with fresh diesel fuel (you don't want to try to turn the engine over to fill this filter -- you may burn up your starter) and install it in the bracket, then reattach the bracket to the vehicle. Attach the control valve with a new O-ring and secure the hoses with screw-type clamps. When the vehicle is running -- inspect for any leaks. Hope this helps -- these are instructions out of the 1998 - 2005 VW manual. Should be no different for the 2006.