I'll do it..
I was wondering what exactly does a fuel filter does and do they go bad and/or throw a code? Would replacing it help with mpgs and where it is on a 98 thanks!
The fuel PUMP in a vehicle squirts the fuel under pressure thru small openings in the intake manifold. This pressure causes the fuel to be vaporized and turned into a flammable mixture.
The openings are so small that tiny particles of rust, dust or other matter will stop them up.. When one or more are stopped up the engine is running poorly and on a mixture that is so lean that parts of the engine overheat..
Ok now the fuel filter.. It takes these small particles OUT of the fuel flow and keeps them until the filter is changed for a new one.
Nope. they don't throw a code.
Yep, they should be changed for a new one.
I change mine with an oil change about every 50,000 miles if it is external.
Most of the newer vehicles have the filter inside the fuel tank and they are only changed when the fuel filter goes away.
Big JIm