One that the worst troubles that can take place to your GMC Envoy is a poor fuel filter. When the filter go bad, it deserve to limit the quantity of fuel the enters the engine. Without fuel, the vehicle will no run in ~ all. With that in mind, many of the symptoms of a bad fuel filter revolve around the auto stalling out.

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Fuel filters have been making a rearward development for the last 50 years, literally. For a long time, you’d find it under the hood. That looked like a small pill, and it would be quick and also easy come replace. This was in the era of carbureted vehicles.

Things started to change in the 80’s. Fuel injection requires higher fuel pressure. Greater fuel push meant that a much more robust fuel filter would certainly be required. This expected the fuel filter was no much longer left under the hood. That was placed in the stole fuel line, in between the gas tank and engine bay.

These fuel filter were more reliable, however they likewise were tougher come change. Repairing them method getting under the vehicle and also disconnecting stole fittings. It yes, really still isn’t that complicated to transaction with, as long as you provide the automobile a couple of minutes for the fuel pressure to walk down.

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

Signs the a poor Fuel Filter: GMC Envoy

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Typical Fuel Filter

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

The engine might throw a P0087 problem code. This trouble password detects the the fuel rail/system push is too low. Any type of trouble codes that exist can be a clue. Periodically when over there is low fuel pressure, you may likewise get an oxygen sensor associated trouble code as well. The real problem with diagnosing a bad fuel filter is the it resembles numerous other vehicular problems in regards to symptoms.

Here space the most common symptoms the a bad fuel filter in her GMC Envoy:

Sputtering Under Load

The only way that you space going to understand that her Envoy’s fuel filter may be going the end is the it is no much longer letting sufficient fuel v to keep the engine running under a heavy load, or at high-speed. Typically, if you room heading increase a hill (or accelerating) the engine may start come feel prefer it is just running the end of steam. That’s what it feels favor with a bad fuel filter.

Now, a poor fuel filter can also feel a hell of a lot favor a negative catalytic converter. Both conditions will make the engine feel choose it is running out of wind as soon as you hit the gas. A poor catalytic converter will not feel as jarring. It’s a smooth absence of power. If you space unsure, examine out this write-up on troubleshooting catalytic converters. If you obtain P0420 or P0430 problem codes v a scanner, it really well may be the catalytic converter bring about these symptoms.

Hard to begin Engine

One the the finest indicators the a clogged fuel filter is going to be that the your Envoy is complicated to start. This due to the fact that there’s not enough fuel push to correctly atomize the fuel as it beginning the combustion chamber.

If your automobile is challenging to start, a clogged fuel filter would probably not be the place to start looking, specifically if girlfriend are obtaining no trouble code for fuel pressure 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 poor coil pack.

Engine no Starting

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

At the most straightforward of levels her GMC Envoy needs three points to start: Air, fuel, and also spark. If any of these things aren’t present, the engine won’t turn over at all. If there’s been zero warning the the fuel filter could be going negative (hesitation, challenge starting, etc) than a clogged fuel filter might not be the place to start. It could certainly cause the difficulty though.

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

It Could likewise be her Envoy’s Fuel Pump

A fuel pump that is going out is walk to feeling the same as a bad fuel filter. This provides telling if you have a negative fuel pump vs bad fuel filter an extremely challenging.

How perform you tell lock apart? A clogged fuel filter will have actually high pressure on its intake side and low pressure on its calculation side. They are both going to cause the very same hesitation at high speed and an obstacle starting. The only way to truly tell is to place a fuel pressure gauge on both sides of the line and get a reading from both.

If your automobile isn’t beginning at all, and also you hear the fuel pump prime the is typically a great indication the the pump is functioning to part capacity. Trial and error your Envoy’s fuel press on each side that the pump would certainly be the best means to diagnose this problem.

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A priming fuel pump sounds favor a high-pitched whine because that a few seconds and can it is in heard v a spicy engine right after the ignition an essential is turned, but before the starter is engaged.

Conclusion: GMC Envoy poor Fuel Pump

The symptoms of a negative fuel pump enhance a the majority of other usual problems that can take place in the GMC Envoy. Testing the filter and pressure on every side of it room going to it is in the quickest means to ascendancy it out. If over there is anything you would choose to add, please leaving a comment below. Good luck!