One that the worst troubles that can occur to your Mazda 6 is a negative fuel filter. When the filter goes bad, it deserve to limit the amount of fuel that enters the engine. There is no fuel, the vehicle will no run in ~ all. Through that in mind, many of the symptoms of a bad fuel filter revolve roughly the auto stalling out.

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Fuel filters have been make a rearward progression for the critical 50 yøears, literally. For a lengthy time, you’d discover it under the hood. The looked prefer a little pill, and it would be quick and easy come replace. This was in the era of carbureted vehicles.

Things began to readjust in the 80’s. Fuel injection requires higher fuel pressure. Higher fuel push meant the a an ext robust fuel filter would certainly be required. This supposed the fuel filter was no much longer left under the hood. It was put in the steel fuel line, in between the gas tank and engine bay.

These fuel filters were more reliable, but they likewise were tougher come change. Repairing them means getting under the vehicle and disconnecting steel fittings. It really still isn’t that complicated to transaction with, as lengthy as you provide the auto a couple of minutes for the fuel press to go down.

The good news is, no matter just how old her 6 is, the symptoms of a poor fuel filter space universal. The doesn’t issue if it’s in-tank or in-line. And, fuel filters room cheap.

Signs that a bad Fuel Filter: Mazda 6

Typical Fuel Filter

There space physical indicators that you can feel as soon as your 6’s fuel filter is clogging. Before taking anything apart, inspect to view if your engines computer has any type of trouble codes saved in it.

The engine may throw a P0087 problem code. This trouble password detects that the fuel rail/system press is too low. Any trouble codes the exist could be a clue. Sometimes when there is short fuel pressure, girlfriend may also get one oxygen sensor connected trouble password as well. The real problem with diagnosing a negative fuel filter is that it resembles countless other vehicular issues in terms of symptoms.

Here room the most typical symptoms the a negative fuel filter in her Mazda 6:

Sputtering Under Load

The only method that you room going to know that your 6’s fuel filter might be going out is that it is no longer letting enough fuel with to keep the engine running under a heavy load, or in ~ high-speed. Typically, if you room heading up a hill (or accelerating) the engine may start come feel like it is just running out of steam. That’s what the feels favor with a bad fuel filter.

Now, a poor fuel filter can likewise feel a hell of a lot like a bad catalytic converter. Both problems will do the engine feel like it is running out of wind when you hit the gas. A poor catalytic converter will not feel together jarring. It’s a smooth absence of power. If you are unsure, check out this article on troubleshooting catalytic converters. If you obtain P0420 or P0430 problem codes v a scanner, it an extremely well may be the catalytic converter resulting in these symptoms.

Hard to start Engine

One that the best indicators that a clogged fuel filter is going to be the the your 6 is complicated to start. This due to the fact that there’s not sufficient fuel push to correctly atomize the fuel together it enters the combustion chamber.

If your auto is daunting to start, a clogged fuel filter would probably not it is in the place to start looking, especially if friend are acquiring no trouble code for fuel push or the oxygen sensors.

Instead, we’d recommend acquisition a look in ~ the ignition device first. Often it’ll be negative spark plugs, or a bad coil pack.

Engine not Starting

If the fuel filter has become so contaminated the the minimum quantity of fuel has actually not been let through it, the engine won’t start at all.

At the most basic of levels her Mazda 6 demands three points to start: Air, fuel, and also spark. If any kind of of these points aren’t present, the engine won’t rotate over in ~ all. If there’s been zero warning the the fuel filter could be going poor (hesitation, an obstacle starting, etc) than a clogged fuel filter might not be the ar to start. It can certainly cause the trouble though.

Here’s a an excellent video on making use of your eye to diagnose the fuel filter:

It Could likewise be her 6’s Fuel Pump

A fuel pump the is going out is walking to feeling the same as a negative fuel filter. This renders telling if you have actually a bad fuel pump vs poor fuel filter an extremely challenging.

How do you tell lock apart? A clogged fuel filter will have high push on its intake side and also low pressure on its output side. They are both going to reason the very same hesitation at high speed and challenge starting. The only method to truly tell is to ar a fuel push gauge on both sides of the line and get a analysis from both.

If your car isn’t beginning at all, and you hear the fuel pump prime that is generally a an excellent indication that the pump is working to part capacity. Experimentation your 6’s fuel push on every side of the pump would be the best means to diagnose this problem.

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A priming fuel pump sounds prefer a high-pitched whine because that a few seconds and can it is in heard v a spicy engine ideal after the ignition vital is turned, but prior to the starter is engaged.

Conclusion: Mazda 6 bad Fuel Pump

The symptom of a negative fuel pump complement a the majority of other usual problems that can take place in the Mazda 6. Testing the filter and also pressure on each side the it space going to it is in the quickest ways to dominance it out. If over there is anything you would like to add, please leave a comment below. Good luck!