Chainsaw is extremely hard to start and won't stay running.
Replaced all fuel line, fuel and air filters, and primer bulb. The saw is difficult to start and won't stay running. When it sounds like it's about to die, I will apply gas and that seems to kill it faster. Also noticed that when I prime the saw the fuel just leaks out of the carb, never happened before.
A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones). click here to download the app (for users in the US for now) and get all the help you need. Good luck!
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
this sort of sounds too me as A fuel line routing problem / as sometimes happens when replacing a old fuel line one doesn't get it back right as it was before and maybe runs line instead by a part that gets hotter than others , this causes fuel to boil in a hot saw and create a air pocket , this makes it near impossible to get liquid fuel to pass by it and blocks up the works , other thing it could be is that primer bulb has a tiny crack inside and allows air to enter and not fuel (heavier) ive seen that happen a few times as well
Does the engine run fine after it starts? Most common problem with primer bulb losing prime is an air leak in the fuel line or primer bulb. Air leaks don't always leak fuel. If there is an air leak between the primer bulb and gas tank there is no pressure, only vacuum. If it is not a major leak it might not leak without pressure but it will allow air to enter the fuel line. If it is a very minor air leak it could allow air to replace the liquid in the fuel line over time, but so little air once it is primer again that the fuel pump can over come it with volume of fuel.
Primer bulbs do not stay firm, as they are when initially pumped up, after the engine is running. There are check valves in the primer bulb that hold pressure in the primer bulb and throughout the fuel line to the engine. Once the engine starts the fuel pump creates vacuum drawing fuel into the engine diminishing this pressure and releasing the check valves. At this point the primer bulb is just another segment of fuel hose allowing fuel to pass through it as the fuel pump demands. The primer bulb functions much better when the outlet side is higher than the inlet side. This position makes it easier for the check valves in the primer bulb to seat and release as needed. If the primer bulb is functioning properly and is positioned with the outlet side higher than the inlet it should not be necessary to cover the end of the fuel hose with your thumb to get it to prime.
If the engine is hard to start after being fully primed there could be a problem with the fuel system on the engine. Some engines are hard to prime once air has entered the system, especially fuel injected models.
On thecarburetorgottwoscrewsto adjust thecarburetor.The first isto adjust thesawwhenworkingat highspeeds.Another iswhen runningat lowrevs.It is best toeitherput backfor about 1.5cycleofthe maximum ofthe end of therotationof thescrews.If thenthe sawstarts, thenyou canadjust itfineat higherrevs(H),thenat low(L).Havecan beminimumscrewthatstops thechain.
Are you sure you have conected the pipes the correct way round, the fuel hose from the tank with the filter on the end goes to the main fuel inlet on the carb, nearest to the alloy pump cover, the other conection off the carb goes to the shorter conection on the back of the primer, the longer pipe on the primer goes back to the tank, just remember the primer pulls fuel from the carb, into the bulb, and back to the tank.
Alow the engine to run for longer on the start setting before you switch to run
Ensure air filter is clean. Foam elements can be washed
with hot water and detergent. Paper elements can be cleaned with
compressed air blown from the inside of the filter but ideally should be
Check fuel lines aren't kinked or blocked restricting fuel flow.
Ensure fuel filter isn't dirty. This is probably located at the end of the fuel line in the tank.
The fuel lines may have become airlocked.This can
happen if the tank is run dry. If the trimmer has a primer bulb,
alternatively press it several times and then try to pull start the
engine with choke on. Repeat this several times. The primer bulb should
feel spongy and fill with fuel.Once the engine kicks, switch to run.
Was it running before the replacement of the fuel lines? Does the primer bulb fill with fuel when pumped? Did you replace the line inside the fuel tank? Check the fuel filter, air cleaner, and muffler for plugging. Hope this helps!