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Question DetailsAsked on 11/26/2017

When I turn fuel valve on and I take off fuel line gas won't come out can y'all help???

I have put new gas have cleaned out gas bowl have gotten it started s couple time but won't stay running

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If it starts well and runs, sounds like NOT an electrical or plug problem - sounds like fuel starvation.


If you disconnect the fuel line from the tank (probably leading into the prime pump bulb if it has one) and no fuel dribbles out, check for totally plugged in-tank screen or filter (usually only with very dirty gas or if left unused for many years), or for vent holes in the cap being plugged. You could try blowing gently backwards through that line to see if you can blow any blockage off the screen. With some small devicesw with tiny tanks, or underslung tanks with upward-aimed fuel line, you may need to gently blow into the tank fill opening to get fuel flowing from the line - do NOT inhale when your mouth is over the tank. For hard top reach tank openings or ot keep from getting fuel taste in your mouth, cut a small hole in a corner of the bag and rubber band a gallon plastic sandwich or freezer bag tightly over the tank opening, and blow into the top of the bag.


If gas dribbles out of the fuel line from the tank, then check if it is priming (if you have a primer bulb) - if you remove the air filter there should be raw gas smell from the carb after priming - or after trying to start with full choke on if no primer. If not, carb is not getting gas - failed primer bulb due to a crack or air leak, or if no primer then possible air leak on vacuum side keeping carb from pulling gas.


If it starts after priming or full choking, but will not stay running (or only if on full choke) then coupld be a vacuum leak so it is not pulling enough gas from tank (see if pumping primer or choking more will keep it running - if so, definitely fuel starvation is the problem).


If starts and runs but then chokes out, typically with black smoke when it dies and/or at restart, it could be choking out - choke is staying on, or air cleaner is plugged up and needs cleaning. Commonly, if air filter is plugged up, will start and run fine a bit then die, or run well at full speed but then almost die, then come back up to speed - or even run fine at full throttle but die when it comes under load as you start mowing or such, because it is getting enough air (at a very rich mixture) to run but not to operate under load - or if surging like it is running out of gas then getting gas, because it is choking out but then gets a fresh gasp of air without fuel as it dies off, allowing it to come back up to revs without totally dying.


If those don't narrow it down, pull the plug and check if sooted up and wet with fuel (and smelling of gas) which would indicate either a plug not firing or it is choking out - excess gas/not enough air, or possibly plug or head gasket is leaking, so there is not enough compresiioon for reliable combustion. If on the other hand the plug is dry and relatively clean (other than likely light rusty colored tinge), and no smell of gas on it, then is likely staving for gas.


I those don't solve it, check for spark from the plug wire - peel runner boot back from the plug wire or pull plug and connect the plug wire, and see if it sparks from wire or plug to frame when held about 1/4" from frame or block when trying to start - if no spark, then could be bad electrical/electronics.


You can find some other similar questions with some diagnosis answers in the Lawn & Garden > Mower and Power Tool Repair link under Browse Projects, at lower left.


Assuming this is a yard power tool, Lawn Mower and Power Tool Repair would be the normal Search the List category for a repair place.

Answered 11 months ago by LCD




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