Question about 2004 GMC Envoy

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Cleaner Any fuel injector cleaner you recommend?? I was told that the fuel filter was underneath the fuel tank is that correct? One last question would it be better to get the fuel injectors cleaned by the dealership? Thanks again for the help..

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Try Lucas brand, they've been in the racing biz forever so they make good products.

Posted on Aug 06, 2008

  • Anonymous Aug 07, 2008

    The fuel pump is in the tank, and theres a filter in the pump as well as the inline filter located on the rear frame rail near the tank.



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Clogged fuel injectors- i am having a problem with either my fuel filter or injectors. i used some cheap injector cleaner for two tanks and the problem went away for a week. i filled the tank again without...

Check your plugs. Using cleaners can clear the clogged injectors but the junk they burn off sometimes ends up on the plugs and can foul them out. You may also have water in the gas tank. Using Dry gas additive for a few tanks will fix that problem. If the plugs are good and you have good gas in the tank (sometimes running the tank low will dredge up garbage and clog your fuel filter) then changing the fuel filter would be the next step.

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My 1991 olds mobile cutlass calais wont start,after I added fuel injector cleaner because,the car was having hesistating problems below 25 miles an hour and it might of been a spark plug problem or fuel...

When you chaged the air filter & sprayed Gumout carb cleaner, you got rid of a little gunk in the
air intake, but when you added the fuel injector cleaner (its the same stuff as carburator cleaner) to the fuel tank, you "cleaned out" ALL the ****/gunk/buildup/dirt in the fuel system which has built up since 1991 and sent it straight to the fuel filter, which is now clogged. The reason that the car tries to start, but fails, is that it'll successfully burn up any fuel that gets past the clogged fuel filter, but the engine consumes that small amount of gasoline quickly, then dies.
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You need to always start with a basic tune up, spark plugs, fuel filter and air filter, as the vehicle will not perform well if any of these three are bad. Then check all vacuum lines for cracks or breaks and replace as needed. You can also add a fuel injector cleaner into the gas tank. I recommend the black bottle of STP concentrated fuel injector cleaner, and you can purchase that at most Wal-Mart's. Good luck :O)

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Rough idleing after pressure wash engine and fuel injector clean

I'm assuming you added fuel injector cleaner to your fuel tank rather than using a direct pressure cleaner through your fuel injectors.
When a solvent/cleaner product is added to your fuel tank, carbonaceous deposits (basically the dirt and gunk accumulated over years) are flushed through the fuel system. This can cause major problems if the contaminants manage to enter your fuel pump and make their way past the seals. This can and has damaged good fuel pumps. Downstream of the pump is the fuel filter - once deposits reach the fuel filter, they may block it and reduce fuel flow. The next major problem areas are the injectors themselves (rather sensitive to dirty fuel) and the engine.
Fuel injector cleaner is not a product I would recommend using. Many major car manufacturer's have recently issued memos to repairers blacklisting the use of cleaner products due to the downstream damage that may potentially be caused by them.
You should replace your fuel filter once you've finished using the tank of injector cleaner. This is most likely the problem (and could have probably used a replacement anyway). I hope this solves your problem. Otherwise you should check your fuel line pressure to ensure the pump is supplying what is required. Failing this, your injectors are probably the next most likely culprit. By this stage, things are starting to get expensive so lets hope the problem is just a blocked filter!
On a related side note; pressure cleaning an engine can sometimes cause water and soap to push down beside the spark plugs in a spark ignition engine. Sometimes this will cause the engine to run a little rough until the heat of combustion burns the contaminants away.
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Hello there :
I would say the most common problem is a clogged fuel filter. Make sure you follow your manufacturers recommendations as to when you should change the fuel filter. This information should be in your owners manual. Symptoms include sputtering at high speeds or engine not starting at all. Always check the ignition system first, if that's ok then the next suspect is the fuel filter.
Next most common problem is the fuel pump failing. Most modern electric fuel pumps can be heard when you turn the key on. If you don't hear the pump running and your car will not start, it could be your fuel pump. The first thing a mechanic will check is the relay which sends power to the pump. If this is operating correctly then the pump will have to be replaced.
Last but not least is dirty injectors. While the fuel filter does a good job of filtering the fuel, it's not perfect. Over time deposits and tiny particles lodge themselves in the injectors. This can clog and injector and prevent it from delivering the fuel the engine needs. It can also cause an injector to stick open and send too much fuel into the engine. A regular addition of fuel system cleaner like STP Injector Cleaner, or Techtron fuel system cleaner can help keep your injectors clean. Most gas stations, department stores and all automotive parts stores will have a good cleaner available. Add it to your empty tank right before you fill up and it will clean as you drive. I recommend doing this every 3 months to keep your injectors performing like new. Mechanics also offer a cleaning service where they actually disconnect the fuel line and flush cleaner through the engine. This is only necessary when you let your injectors get to a point where they can not be cleaned by a store-bought product. Regular use of a good in-tank cleaner will keep you from having to pay for this service. Where do you buy your gas?
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Octane rating tip !!!!
Putting super in the tank will not get you any more performance or gas mileage unless specifically recommended by your cars manufacturer. If your owners manual says put in 87 octane...... DO IT. You are throwing money out the window if you are filling up on Super or Premium and you only need Regular.
Hope this is very helpful for you '
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1 Answer


The fuel pressure regulator is not adjustable,

Focus on cold air intake or just clean the air filter.

Filter injector need lubrication to free up the deposit.

I recommend two tank full of Chevron and Lucus fuel injector cleaner.

Lucus will also remove carbon deposit on the cylinder head.

Dec 11, 2009 | 1997 Nissan Pathfinder

1 Answer

Check engine light on

I had to do some digging to find this info: The code is P2716, which is a problem with the 'transmission pressure control solenoid D or it's circuit.' It is located on the transaxle valve body. There apparently is a technical service bulletin (TSB) # 1406 concerning this. If your Corolla is still under warranty, the dealer will fix it, which is, according to what I could find, replacement of the computer that controls the transmission. The bucking problem you described may have actually been a transmission shifting problem, a symptom of this code the cars computer threw. If you did get some debris drawn out of your gas tank due to the low level, the injector cleaner might help, but it has nothing to do with this code. I would recommend you have the fuel filter replaced (to address the low fuel tank, possible debris drawn into fuel line issue), and check w/ the dealer about the TSB, it covers '05 thru '07 Corollas.

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1 Answer

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1.) Change the fuel filter.
2.) remove all old gas (should actually drop the tank)
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You may also have a screen or filter in the gas tank itself that can get clogged. Get rid of as much bad gas as possible. Like I said above it is recommended that you drop your gas tank but if you don't want to make sure to get all old gas out of tank and at the very least put a good amount of stabil in the tank fill with gas do the fuel rail injector cleaner they sell these kits at auto part stores. Hope for the best.

Let me know how it goes.

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3 Answers

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I would recommend replacing your fuel filter, I also drive a V6 and after replacing my filter it really improved my milage and my car ran alot smoother. I would also recommend buying a octane fuel cleaner, that will clean out your fuel injectors if those are clogged up. If it comes down to down you may need to replace the fuel injectors, but it doesn't sound like the problem is too severe if the engine is still running which is good. I recommend not to drive until the fuel filter is replace as well as putting octane injector clearner in the gas tank. You can find the octane cleaner at Checkers for cheap.

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