Fuel filter & fuel sysetm flush

[2slo4now]

Here is my 2 cents

Your fuel filter will get dirty. It is it's job. How often you change it depends on many things. What kind of fuel, where do you get fuel, is it filtered at the filling pump, have you ever got gas when the tanker truck is filling the tank. The bottom line is you don't know how clean your fuel is. It is rare to plug a fuel filter in 15,000 miles but it can happen. Filtered high octane fuel is usually clean enough to only require fuel filter replacement every 30,000 miles max.

Flushing the fuel system is a joke. In fact it is boarderline fraud. Your H2 as well as every other fuel injected vehicles fuel system constantly circulates fuel thru a 4 micron sock in the tank to the pump thru the filter to the fuel injectors rails thru a pressure regulator then back to the tank. It is a constantly flushing system. The only why to flush a fuel system would be to pull the tank, dump the gas, clean the inside of the tank. This is not recommended by any manufacturer.

It is never bad to replace a fuel filter.

Dan from Alabama

ASE Master Tech
GM Certified Tech
ex-GM field service Engineer