How To Replace Fuel Filter 2008 Mercury Mariner

Ane of the worst bug that can happen to your Mercury Mariner is a bad fuel filter. When the filter goes bad, it tin can limit the corporeality of fuel that enters the engine. Without fuel, the vehicle will not run at all. With that in mind, nigh of the symptoms of a bad fuel filter revolve effectually the vehicle stalling out.

Bad Fuel Filter Symptoms Mercury Mariner

Fuel filters have been making a rearward progression for the last fifty years, literally. For a long time, you lot'd detect it under the hood. It looked similar a little pill, and it would be quick and easy to replace. This was in the era of carbureted vehicles.

Things began to change in the lxxx's. Fuel injection requires higher fuel pressure. College fuel pressure meant that a more robust fuel filter would be required. This meant the fuel filter was no longer left under the hood. It was put in the steel fuel line, between the gas tank and engine bay.

These fuel filters were more than reliable, but they too were tougher to change. Repairing them means getting under the vehicle and disconnecting steel fittings. It actually still isn't that difficult to bargain with, as long every bit you give the vehicle a few minutes for the fuel pressure to become downwardly.

The proficient news is, no thing how quondam your Mariner is, the symptoms of a bad fuel filter are universal. It doesn't affair if information technology'southward in-tank or in-line. And, fuel filters are cheap.

Signs of a Bad Fuel Filter: Mercury Mariner

Mercury Mariner Bad Fuel Filter Diagnosis — Typical Fuel Filter

In that location are physical signs that you can feel when your Mariner'due south fuel filter is bottleneck. Before taking annihilation autonomously, check to see if your engines calculator has whatsoever trouble codes saved in it.

The engine may throw a P0087 trouble code. This trouble code detects that the fuel rail/system pressure level is too low. Any trouble codes that exist could exist a clue. Sometimes when there is low fuel pressure, you may also go an oxygen sensor related trouble code equally well. The existent consequence with diagnosing a bad fuel filter is that it resembles many other vehicular issues in terms of symptoms.

Here are the nigh common symptoms of a bad fuel filter in your Mercury Mariner:

Sputtering Nether Load

The only fashion that you are going to know that your Mariner's fuel filter may be going out is that it is no longer letting enough fuel through to keep the engine running nether a heavy load, or at high-speed. Typically, if you are heading up a loma (or accelerating) the engine may start to feel like it is just running out of steam. That's what information technology feels similar with a bad fuel filter.

At present, a bad fuel filter can besides experience a heck of a lot like a bad catalytic converter. Both conditions will brand the motor experience similar it is running out of wind when you hit the gas. A bad catalytic converter will not experience as jarring. It's a smooth lack of ability. If you are unsure, cheque out this commodity on troubleshooting catalytic converters. If you get P0420 or P0430 trouble codes with a scanner, information technology very well may exist the catalytic converter causing these symptoms.

Hard to First Engine

One of the best indicators of a clogged fuel filter is going to exist that the your Mariner is hard to start. This because there'southward not plenty fuel pressure to properly disintegrate the fuel as it enters the combustion chamber.

If your car is difficult to start, a clogged fuel filter would probably not be the place to start looking, especially if you are getting no problem code for fuel pressure level or the oxygen sensors.

Instead, we'd recommend taking a wait at the ignition system first. Often it'll be bad spark plugs, or a bad gyre pack.

Engine Non Starting

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

At the most basic of levels your Mercury Mariner needs three things to start: Air, fuel, and spark. If whatsoever of these things aren't nowadays, the engine won't turn over at all. If at that place's been aught warning that the fuel filter could be going bad (hesitation, difficulty starting, etc) than a clogged fuel filter might not be the place to kickoff. It could certainly cause the problem though.

Here's a great video on using your eyes to diagnose the fuel filter:

It Could As well be Your Mariner'due south Fuel Pump

A fuel pump that is going out is going to feel the same as a bad fuel filter. This makes telling if y'all have a bad fuel pump vs bad fuel filter very challenging.

How practice you tell them apart? A chock-full fuel filter will have high pressure on its input side and low pressure on its output side. They are both going to cause the same hesitation at high speed and difficulty starting. The only mode to truly tell is to identify a fuel pressure gauge on both sides of the line and get a reading from both.

If your car isn't starting at all, and you hear the fuel pump prime number that is usually a good indication that the pump is working to some chapters. Testing your Mariner'due south fuel force per unit area on each side of the pump would exist the best manner to diagnose this problem.

A priming fuel pump sounds like a loftier-pitched whine for a few seconds and tin can be heard with a precipitous engine right after the ignition key is turned, but before the starter is engaged.

Conclusion: Mercury Mariner Bad Fuel Pump

The symptoms of a bad fuel pump match a lot of other common problems that can occur in the Mercury Mariner. Testing the filter and pressure on each side of it are going to be the quickest ways to rule information technology out. If at that place is anything you would like to add together, please exit a comment beneath. Skillful luck!