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It's been a while since I've run my welder. I can get it started by adding a little gasoline to the carb, then it will stop as it isn't getting any gas from the tank. How do I know if fuel pump is working properly, or needs to be primed, or if it is a carb issue?

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Disconnect the fuel line at the carburetor, then run the engine by priming the carburetor. If no fuel is pumped out of the line, then back up to the pump, and then to the tank itself (may be a filter issue). Is the fuel pump electric or run by the engine mechanically? If electric, you should be able to hear it running. A mechanical pump needs to be disconnected from the engine and operated manually to check it's operation. If the tank has a filter bowl with a screen in the upper part, the screen may be plugged--dig it out and wash it with spray carburetor cleaner. Once you get fuel flowing from the line at the carburetor, but the engine still doesn't run, then remove the carburetor float bowl, the float, and needle valve. The needle valve can sometimes stick closed, or debris can block entry of fuel into the carburetor. Check the jets for plugging as well. Hope some of this helps!

Posted on Dec 30, 2010


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My kolher engine on my rototiller will not start.I can put a little bit of gas where the spark plug goes and it will start for a few seconds but won't keep it major?

No what the problem may be is the gas tank filter may be stopped up or the carburetor has varnished gasoline in it? In the future use an additive called stabil can be found at most auto parts stores or Walmart has it in automotive around the gasoline additives! It gasoline from varnishing and becoming gel like in the winter when you store your mowers weedeaters and tillers! Try getting gasoline to be pulled up by making sure gas flows from fuel lines first! If you don't have a primer button then you more than likely have a choke on the carb? Close the choke you can use ether sparingly to ease in pulling the rope frequently or a rag soaked with a little gas will allow vapors to get sucked in the carb assisting the engine to start

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My power pro 5500 running bad unless I hold butterfly on carb open

Sounds like dirt or varnish in the carb. You will have to take the carb apart and use some carb cleaner. Spray it in and be sure to wipe it down. This most probably happened because you stored the gasoline in the generator tank without adding a good gasoline staybilizer if your going to store it for a long period of time. I usually flush out all of the gasoline whenever I finish using mine. Here is a tip.. Once you finish using your generator then drain out the gasoline then keep trying to start it up again. Once it starts just let it run out of fuel. This gets everything out of the lines and the carb.

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Good luck,


Jul 16, 2014 | Electrical Supplies

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Looks like fuel isn't getting to the carburator

If you are using gasoline that has alcohol in it for air pollution control, it may have ruined the seals in the carb.

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The bike wont stay running without the choke pulled out a bit, even after its warmed up. what could be causing this?

It sounds like your bike is running too lean, which is to say that it's not drawing enough gasoline through the carbs to match the air that's coming in through the air intake. Pulling out the choke reduces the amount of air coming in, creating a richer air/fuel mixture.

The most common cause for this problem is that one or more jets have gummed up slightly and so aren't able to pull through the right amount of gasoline. This happens a lot with modern gasoline if the bike has been permitted to sit for a while without being run (I've heard it can happen in only a few weeks; I've experienced it if I let my bike set 2-3 months). The idle jets that use use when you first start the bike or when the bike is just, well, idling, have the smallest diameters and are most prone to clogging.

The comprehensive solution to this problem would be to pull the carbs and completely clean them out. The whole bike will run better after you do that. The faster solution would be to clean only the idle jets, which occasionally can be removed from a carburetor while it's still in place on the bike. You might be able to do that for the two outer carbs on your bike, but I question whether you'd be able to do that with the inner 2 carbs.

Cleaning the jets themselves is the easiest part of the process--getting to them is the problem. The jets are made of soft brass, so you can use a a toothpick and/or a piece of very thin copper wire (it's softer than brass) to clear the jets. Simply using compressed air and/or carb cleaner is unlikely to get the crud out, though you can use all of these things together to get the job done. I sometimes soak the jet with cleaner, then poke it clear, then blow some air through it to get out any residual particles.

Pulling and reinstalling the carbs may require them to be re-synchronized. This, too, would make your bike idle and run better. However, if all you've done is remove, clear, and reinstall the idle jets, you may not have to synchronize the carbs, as you've done nothing to change their present settings.

Good luck!

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I have a 5500 ppg generator that won't start. I've verified the fuel lines to the engine are delivering fuel, but won't start. I've been able to pour a small amount of fuel down the carb...

Hello, ushicks/me hillybilly. One question how old is the fuel in then generator tank,Hey. If it has a fuel filter replace it. Modern gasoline is junk fuel and after a few months it looses some chemical proprieties. GB...stewbison

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Bike will stay on with the choke pulled out but when you try to give it gas (throttle) it's wants to turn off. Its seams that the throttle isn't working. It has a full tank and i gave it an oil...

The problem is in the carb. With today's gasoline, when it is allowed to evaporate in the float bowl, it leaves behind the thick gummy additives that were added to the gasoline to make it a better fuel. This thick gummy mess stops up the small holes in the fuel metering jets and the fuel passageways in the carb. The carb needs to be taken off the engine, completely disassembled, and soaked in a professional grade carburetor cleaner. Needless to say, this is a job that is best left to professionals as there are several things in the carb that can be reassembled incorrectly or damaged.

Good Luck

Jun 15, 2011 | 2005 Harley Davidson XL 883L Sportster

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Bike sits a lot,Hard to start, will only continue to run with choke on. Bike backfires alot.

You need to clean your carburetors. The ethanol that is in gasoline turns to an orange colored film
and it clogs the jets. The prevention for this seems to be seafoam added to your gasoline after your carbs are clean.
It does work. If your bike sits a lot, i would also suggest that you start it up weekly and let it warm up. Sitting is the worse thing for gasoline.
Judging from your description and other problems, the backfire is probably bad gas not burning and igniting in the cylinder when overloaded with gas.
A good carb cleaning, consists of taking the carbs off the bike, taking out all the jets and soaking everything in a good carb solution.
I would start with the carb cleaning, drain the old gas out of the tank, start with fresh 93 octane and add the recommended dose of seafoam listed on the back of the botlle to your gasoline.
Put a set of new spark plugs in it, and fire it up.
Your back fire should be gone as well.

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Power loss after warm up

Most certaintly a fuel problem. It sounds to me like you might have a high speed jet a little stopped up. I would pull the carb and clean the jets. If the fuel is a little old, and I do mean a little, and the bike sat a little bit, the carbs probably a little varnished. The gasoline we have no days aint nowhere near what it use to be. Clean carb and all should be well. Also for future referance if you know your gonna let the fuel sit more than a couple weeks, I would use a fuel stabilizer and run the bike a while to make sure the stablelizer gets in the carb.

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