The water separator for a 2003 Jetta is built in with the fuel filter. It is located at the bottom of the filter, and should be drained every 10k miles.
If you are performing your normal 20k service maintenance you probably don't need to worry too much, due to the fact that you change the fuel filter every 20k miles.
water separator removes water (liquid) but moisture separator removes water vapor
The 2003 Volkswagen Jetta has 8 valves.
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circuit of bilge oil water separator
The 2003 Volkswagen Jetta is a gas-powered vehicle.
The 2003 Volkswagen Jetta has a 5-speed manual.
The 2003 Volkswagen Jetta has an inline 4 engine.
The height of the 2003 Volkswagen Jetta is 4 ft. 8.7 in. (56.7 in.).
The 2003 Volkswagen Jetta's turning circle is 35.8 ft..
The 2003 Volkswagen Jetta is 14 ft. 4.3 in. (172.3 in.) long.
The 2003 Volkswagen Jetta has a drag coefficient of 0.30 Cd.
The curb weight of the 2003 Volkswagen Jetta is 2892 lbs..