2002 Ford F-150 – Harley Davidson, supercharged 5.4L V8 -…

Harley davidson 2002 engine is leaning out

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Air density drops as the altitude increases, and the amount of air going into the engine is reduced. The only way to keep the proper ratio is to reduce the amount of fuel going to the engine. We decrease it by leaning the mixture. During cruise, leaning is normally required when above 3,000 feet MSL.
Yes, an engine running lean can certainly end up damaging itself. An engine that`s designed to use a stoichiometric mixture will make less power when fed a lean mixture compared to its figure from when it was running a stoichiometric or rich mixture. An engine running lean can also lead to a `soft seize`.
Running rich only occurs if there is an issue with your engine`s combustion process. The cause of this is your engine receiving too much fuel. Conversely, “running lean” refers to your car receiving too much air and not enough fuel.
A rich-running engine is caused by excess fuel and lack of air, whereas an engine running lean is the exact opposite – the engine lacks enough fuel or there is an excess of air. These conditions can cause trouble down the line, potentially causing knocking or leading to complete engine failure if not resolved.
If the engine is made to run too lean, combustion becomes extremely variable from one cycle to the next, exhaust gas temperatures rise because of the persistence of flames from `late-burn` cycles, and the engine starts to misfire frequently. All of these result in high levels of hydrocarbons in the exhaust gases.
TOO Lean Defined:

Low Body Fat percentage: Under 10% for men and, under 15% for women.

For optimum fuel economy 16-17:1 is usually best, leaner than that and the car will begin to misfire. Maximum power is usually found between 12-14:1, but this may be too lean for safety on many engines. For maximum reliability at full power, air fuel ratios from 10.5-12.5:1 are considered best, depending on the engine.
Adding in extra fuel prevents detonation and just generally makes the engine happier. So, yes, if you lean out your engine, going from 12:1 to around 14:1, your engine will run a bit hotter.
Lean Air/Fuel Mixture

Not only can a rich air/fuel ratio cause a backfire, a mixture that doesn`t have enough gasoline can cause a backfire, too. A “lean” mixture is one that doesn`t have enough fuel, and too much air.

When lean the engine`s air-fuel ratio is closer to ideal stoichiometry & the engine runs hot, making it more efficient & getting more power per unit of fuel, with resulting higher combustion temperatures, greater mechanical power load & greater thermal load.
Lean Air/Fuel Mixture

When a lean mixture combusts, it burns more slowly, meaning there will still be some air and fuel that isn`t used up when the exhaust valves open — leading to a backfire.

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2005 4 stroke yamaha 150 550hrs. normally use every week but due to surgery not used for 10weeks. Just before I went down I changed internal fuel filter, and zincs in motor. finally put in sunday. motor started fine left dock hit the power and started to come up on plane then stuttered and died. changed the external fuel/water seperator pump up the primer and started up again. with in a minute died down again. limped back to dock checked fuel filter and plug wire connections. pumped up primer and left dock went right onto plane for maybe 150yds then coughed and died. I could pump up primer and it would run but then die out. the fuel filter at the front of the engine would run dry until I pumped it up again. If it were a car I would suspect a leak in a fuel line but I can’t find any sign of one.
before we launched I put 10 gallons of fresh fuel in and added another bottle of ethanol stabilizer (CRC brand)
what proceedure should I follow to isolate the problem? I am a fairly competent mechanic as far as cars and trucks go. I don’t really want to have to take it to a marine mechanic.
ANSWER : This is going to be the fuel pump is not pumping any fuel. The primer is acting as a fuel pump. When you prime it, it gives the engine enough fuel to run for a little bit. But as soon as the fuel runs out, the engine is dying. So this is going to be a bad fuel pump.

My 1977 Evinrude 140 HP outboard engine looses power when it hits @4,200 rpm’s and goes down to 3,500 then back up to 4,200 and then back down to 3,000 or about there. This would continue if I didn’t slow down to 3,000 on my own. It runs fine at @ 3,000 when I slow it down. I have changed all the fuel lines from the fuel tank to the carbs, removed, cleaned out the fuel tank, put new gas and added a can of SeaFoam. I replaced the water seperator filter and cleaned the fuel filter. I feel the fuel pump is operating OK. Any ideas about what could be causing my problem? Could it be a bad power pack or stator? Help!!
ANSWER : Hi, this is obviously a stator problem since you have cleaned the fuel filter..

Take care

Water in the fuel tank of my Zodiac dinghy with Yamaha 2001 50 HP
ANSWER : I’d add a little dry gas to **** up any remaining water and give it a shot

09 kx250f fuel leak
ANSWER : Sounds like your carb is dirty inside. make sure its out of warranty first, (don’t want to void it), then pull off the bowl at the bottom of the carb and clean it. Try to avoid useing acetone based cleaners as this can sometimes ruin some seals/gaskets/components.

I have a Husqvarna 570 that quit running, It idled for about 30 sec. and shut off. It has spart and the plug is wet, its getting fuel. Had the ignition tested and fuel lines. checked fly wheel and timing. Seems like it is getting too much fuel and after a few pulls fuel runs out of the exhaust?
ANSWER : Hi keachfamily4…

Sounds like you have dirt/debris in your carburetor jets or fuel passages but for sure under your inlet needle valve. This problem will cause fuel to come out of the exaust, and carburetor at times.
Follow the directions below and you will be able to get your Husqvarna 570 running again.
Make sure you are using fresh fuel…and oil mix if your using a two cycle mower or weedeater with the oil to the right mixture and not too much oil as it can cause hard starting.If the mower/weedeater is over a couple of years old, then I recommend that you buy and install a new carburetor repair kit,because the diaphragm will get hard and that will cause it to be hard to crank.Sounds like you will need to clean the carburetor or replace your carburetor internal rubber parts like the diaphgram and O rings.I recommend that you use a laquer thinner type cleaner to clean and dissolve the laquer build-up in the float and needle jet passages.Be sure to remove all plastic and rubber parts before using the laquer thinner because it can dissolve the plastic parts and render them unuseable.Be sure to use compressed air to blow out all the fuel and air passages.Be careful when blowing out the passages, because there are sometimes small rubber type seats in the bottom of some of the passages.Sometimes you can get by with priming the carburetor or using starting fluid and letting it run a few times like that and it will flush the gunk out of the jets,but most of the time you will need to rebuild the carburetor.Keep in mind that the float (if you have one) for the carburetor must be level when you go to reassemble the carburetor or follow the instructions you get with the carburetor kit.When you clean your carburetor and remove the jet screws, you will first need to lightly seat the jet screws.But before you lightly seat the jet screws count the number of turns it takes to seat the jet screws from their original position.Be sure to mark the turns down on a piece of paper.That way when you put the jets back in, you know to lightly seat them first and then turn them back out to their orginal position before you started.Once you have your carburetor rebuilt and reinstalled that should solve your problem.
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LX 188. Engine suddenly dies. The fluel in the bowel of the fuel filter is empty. If I crank the engine the filter becomes dry and is collapsing some but the engine does not start. When I remove the supply line from the fuel pump to the carberator and crank the enginge there is a strong stream of gas being pumped out. I tap on the carberator ??? is the float is hung not allowing fuel to enter. Cranking the engine with the line off refills the bowel of the gas filter. Reattache line to the carberator===engine starts. Ran perfect for 20minutes then suddenly died. Repeated all the above and engine again started. What to do to fix this? Thanks
ANSWER : Debrie inside the needle and seat area which has to be cleaned out with carburetor cleaner and compressed air

Fuel system problems
ANSWER : I believe the IO-550 has an electric fuel boost pump that is activated by throttle position. It might be that the micro-switch that activates the pump has been improperly set, causing the pump to turn on & off at cruise settings. The pump is there to make sure of sufficient fuel delivery at high power.

Bob