One the the worst problems that can take place to her GMC Envoy is a negative fuel filter. As soon as the filter go bad, it deserve to limit the quantity of fuel that enters the engine. There is no fuel, the auto will not run at all. With that in mind, many of the symptom of a bad fuel filter revolve around the automobile stalling out.

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Fuel filters have been make a rearward development for the last 50 years, literally. Because that a lengthy time, you’d discover it under the hood. That looked like a tiny pill, and it would be quick and easy come replace. This remained in the era of carbureted vehicles.

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

These fuel filter were an ext reliable, yet they likewise were tougher come change. Repairing them method getting under the vehicle and disconnecting stole fittings. It yes, really still isn’t that complicated to deal with, as long as you give the automobile a couple of minutes because that the fuel push to go down.

The an excellent news is, no matter just how old your Envoy is, the symptom of a negative fuel filter room universal. That doesn’t matter if it’s in-tank or in-line. And, fuel filters are cheap.

Signs of a negative Fuel Filter: GMC Envoy

Typical Fuel Filter

There room physical indicators that you deserve to feel as soon as your Envoy’s fuel filter is clogging. Prior to taking something apart, inspect to view if your engines computer has any kind of trouble codes saved in it.

The engine might throw a P0087 trouble code. This trouble code detects that the fuel rail/system press is too low. Any type of trouble codes that exist can be a clue. Sometimes when over there is short fuel pressure, girlfriend may likewise get an oxygen sensor connected trouble code as well. The real problem with diagnosing a negative fuel filter is the it resembles numerous other vehicular worries in terms of symptoms.

Here space the most typical symptoms of a poor fuel filter in your GMC Envoy:

Sputtering Under Load

The only way that you are going to recognize that her Envoy’s fuel filter might be going the end is the it is no much longer letting sufficient fuel with to keep the engine running under a heavy load, or at high-speed. Typically, if you are heading increase a hill (or accelerating) the engine might start come feel choose it is simply running the end of steam. That’s what it feels prefer with a negative fuel filter.

Now, a negative fuel filter can additionally feel a heck of a lot prefer a bad catalytic converter. Both problems will do the motor feel choose it is running out of wind when you fight the gas. A bad catalytic converter will certainly not feel together jarring. It’s a smooth lack of power. If you space unsure, inspect out this article on troubleshooting catalytic converters. If you get P0420 or P0430 problem codes v a scanner, it really well may be the catalytic converter resulting in these symptoms.

Hard to begin Engine

One the the finest indicators that a clogged fuel filter is going to be that the your Envoy is complicated to start. This since there’s not enough fuel push to effectively atomize the fuel together it beginning the burning chamber.

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

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

Engine not Starting

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

At the most basic of levels her GMC Envoy needs three things to start: Air, fuel, and also spark. If any type of of these points aren’t present, the engine won’t revolve over in ~ all. If there’s to be zero warning the the fuel filter could be going bad (hesitation, difficulty starting, etc) than a clogged fuel filter could not it is in the location to start. It can certainly reason the difficulty though.

Here’s a great video on utilizing your eyes to diagnose the fuel filter:

It Could likewise be your Envoy’s Fuel Pump

A fuel pump the is going out is walk to feel the very same as a negative fuel filter. This makes telling if you have a bad fuel pump vs bad fuel filter really challenging.

How carry out you tell castle apart? A clogged fuel filter will have high push on its entry side and also low pressure on its output side. They room both walk to cause the same hesitation at high speed and difficulty starting. The only means to important tell is to ar a fuel press gauge top top both political parties of the line and also get a reading from both.

If your car isn’t beginning at all, and also you hear the fuel pump prime that is commonly a great indication that the pump is working to part capacity. Testing your Envoy’s fuel push on each side the 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 couple of seconds and can be heard through a sharp engine best after the ignition vital is turned, but before the starter is engaged.

Conclusion: GMC Envoy negative Fuel Pump

The symptom of a poor fuel pump enhance a the majority of other common problems the can happen in the GMC Envoy. Testing the filter and also pressure on each side of it are going to it is in the quickest methods to rule it out. If over there is anything you would prefer to add, please leaving a comment below. Good luck!