I have an old Homelite trimmer that I recently put all new gaskets in, 2 new fuel lines ( only has 2), new fuel filter and new spark plug. The trimmer fires up and runs fine for 5-7 minutes and then dies. About 30 seconds after it dies gas starts gushing out from the carb through the air filter. I can see the gas coming up from one of the fuel lines while it is doing it. Anyone got any idea whats happening to it.
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This could be a number of things. Clogged air filter/fuel filter/carburetor/fuel tank lid breather hole, cracked fuel line or primer bulb, or clogged spark arrestor in muffler. Here's some links that will help to change the bulb, fuel cap, fuel lines, rebuild carb, replace spark arrestor, and troubleshoot. Homelite Tune Up
replace the fuel lines and check that the filter in the fuel tank( its on the end of the intake fuel hose) is clean. If there is an air leak somewhere in the old lines it will cause the trimmer not to get enough gas.Then clean the carburetor with carb cleaner- take the carb off by removing the air filter first then undo the two nuts holding on the carb and take off accelerator cable remembering which hole it came from. spray the hole carb with the cleaner on the inside and outside then soak it in the cleaner trying to get any dirt out. put it back together and it should start...if not you might need a new diaphragm in the carb.
You can go to a small engine repair shop, parts shop or look on eBay and they should have the fuel lines you need. Not very expensive, about $1.00/foot for new Tygon lines. You are way overdue for replacing yours. The ethanol in the gas does a job on them.
Fuel starvation - 'lean fuel' condition
Basic things to check: 1) spark plug 2) spark arrestor in muffler 3) fuel lines and tank filter 4) turn adjustment needles out (counterclockwise) 1/4 to 1/2 turn Chain Saws: 5) check impulse tube and intake boot for cracks or leaks
*if all of the above are OK and/or do not improve performance then: Remove Carburetor 6) replace gaskets/diaphragms a) use a spray carb cleaner to clean jets, holes, and body of carb b) fuel pump diaphragm goes against the carb body, then the gasket towards the outside c) metering gasket goes against the carb body, and the diaphragm goes towards the outside
I resolved my problem by taking apart the carborator and cleaning it. There were clogged passaged that had stuff come out of them when I used airisol carb cleaner to blow them out. I only had to make one gasket the carb mount gasket which is pretty basic only 5 holes.
It ran for the next 3 hours, ran fantastic!!!!!!
i had the same problem with my trimmer. you could replace the fuel line but if you don't want to hassle with fishing it thru the hole i suggest going to homelite.com and ordering the gas tank. it only cost me $18 with shipping and came with everything (tank, lines-with fuel filter, and gas cap). all you need to do is take out the 4 bolts on back of trimmer and the 2 top bolts holding the housing together. be careful not to nick any gaskets especially the one behind the 4 bolts. this is the crankcase gasket. also don't get anything in the crankcase that will score it as this will ruin the trimmer. also there are 3 spacer gaskets that go in the holes in the fuel tank and i believe a plastic heat shield between the gas tank and the bottom of the trimmer. you will see this when you take the tank off. just be careful and be sure all the bolts get tightend up (especially the 4 on the back as this is the back side of the crankcase). it only took me 15 min to replace it and the trimmer runs great. all the above info is if you have a trimmer with the gas tank on bottom. if the tank and gas cap are on top hopefully someone else will be able to help.
The most probable problem is no fuel delivery to the engine.
1. Check/replace the fuel in-tank filter, you should be able to easily blow through it once removed. The primer bulb will sink down and not return quickly if the filter is bad. Fuel will not return to the tank via the return line if the fuel filter doesn't allow fuel to be pulled in.
2. If fuel is returning to the fuel tank when the primer is pushed then your problem is inside the carb.
3. To verify this put a small quantity of gas in the lid of a water bottle (half full). And pour it into the carb throat. Replace the air filter to prevent a backfire from shooting flames out. Try to start the weedwacker. If it runs and then dies the problem is inside the carb.
4. If you are really good at working on things with small parts you can clean out the carb and replace all of the gaskets to solve the problem. If this isn't for you then you should take it to a lawn shop and have them clean the carb and replace the gaskets.
NOTE: Replacing the gaskets is very important because the gaskets get stiff and the fuel pump action of one of the gaskets is reduced or stopped.