Someone told me the fuel filters in the newer envoys are actually in the gas tank?? If this is true what mileage do you guys typically recommend for a change as it would seem gm designed them to last longer if they are in the tank??

Thanks!

Your fuel filter is one of those engine components that may only cost $10 or $20, but can protect your engine from thousands of dollars in damage if you change it regularly. Fuel filters protect some of the very delicate parts of your engine. Carburetors and fuel injection systems can be clogged up by the tiniest of particles, so a properly functioning fuel filter is very important. If your fuel filter starts to get clogged up, the fuel trying to flow through the filter to your engine gets stuck in line like soccer moms at a 5 am Thanksgiving Day sale.

It only takes a few minutes to replace your fuel filter, and it should be replaced once a year on the average commuter vehicle. Replacing your fuel filter should be part of your car's regular maintenance schedule.
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linkpoint
Six Sigma Tutorial

There should be what looks like a valve stem cap for a tire on the fuel rail press the little stem on this in with the key turned on cup your hand over top of it first it should spray fuel out at high pressure momentarily if it just dribbles or nothing comes out no fuel pressure should be around 40 psi on that line. if not high pressure remove fuel filter put finger over fuel line into filter and have someone turn key on should have enough pressure to blow your finger off, if not pump is bad if so replace fuel filter making sure you put it in with flow going correct direction they are one way flow.

This is the fast and dirty way to check but it works i recommend you not be smoking a cigarette or near open flame when you do this as gasoline is going to get on you, your car and the ground. Going up in flames isn't a pleasant way to spend your day.

Otherwise take to a shop, and let them figure it out.
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chicago prom limo
Audi Leasing

Hi, i'm agree with you guys, your fuel filter needs to be change at least ones a year because is an important part of your car, this filter protect your car. A fuel filter is a filter in the fuel line that screens out dirt and rust particles from the fuel. They are normally made into cartridges containing a filter paper. They are found in most internal combustion engines.

Fuel filters serve a vital function in today's modern, tight-tolerance engine fuel systems. Unfiltered fuel may contain several kinds of contamination, for example paint chips and dirt that has been knocked into the tank while filling, or rust caused by moisture in a steel tank. If these substances are not removed before the fuel enters the system, they will cause rapid wear and failure of the fuel pump and injectors, due to the abrasive action of the particles on the high-precision components used in modern injection systems. Fuel filters also improve performance, as the fewer contaminants present in the fuel, the more efficiently it can be burnt.

Fuel filters need to be maintained at regular intervals. This is usually a case of simply disconnecting the filter from the fuel line and replacing it with a new one, although some specially designed filters can be cleaned and reused many times. If a filter is not replaced regularly it may become clogged with contaminants and cause a restriction in the fuel flow, causing an appreciable drop in engine performance as the engine struggles to draw enough fuel to continue running normally.

Some filters, especially found on diesel engines, are of a bowl-like design which collect water in the bottom (as water is more dense than diesel). The water can then be drained off by opening a valve in the bottom of the bowl and letting it run out, until the bowl contains only diesel. Many fuel filters contain a water sensor to signal to the engine control unit or directly to the driver (lamp on dashboard) if the water reach the warning level. It is especially undesirable for water to be drawn into a diesel engine fuel system, as the system relies on the diesel for lubrication of the moving parts, and if water gets into a moving part which requires constant lubrication (for example an injector valve), it will quickly cause overheating and unnecessary wear. This type of filter may also include a sensor, which will alert the operator when the filter needs to be drained. In proximity of the diesel fuel filter there might be a fuel heater to avoid the forming of paraffin wax (in case of low temperatures) inside the filtrating element which can stop the fuel flow to the engine.