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Carb pumps air back into fuel supply line engine will start with gas sprayed into carb but as soon as it runs out, engine will die. Primer bulb will pump up until it gets hard, but even after the engine starts and dies, it still remains pumped up and hard.

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Check the fuel lines for cracks/breaks. If they are o.k., then:

You will need to disassemble the carburetor and spray with carb.cleaner. Make sure the small screen is free of debris. (Should be able to see daylight through it.) Use a Den Tek Brush, (http://www.drugstore.com/products/prod.asp?pid=165357&catid=1152), to clean the small portals in carb. These portals can become blocked. You can also use the Den Tek Brush to clean the jet in carb. if it has one. Reassemble and start.

If the carb. parts are more than 4 years old, you may have to replace them.

If you need further assistance, just let me know.

Jim

Posted on Jun 21, 2009

  • Jim Parker
    Jim Parker Jun 25, 2009

    Thanks for the rating.

    If you should have any questions about
    "Drywall Finishing/Patching", or know someone who does, put your
    questions to Category:"Tools- Building & Power- HAND TOOLS" at
    FixYa.com

    Thanks Again,

    Jim

















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1 Answer

Trimmer won't prime to start


Look inside the tank. Some units have a stone inside that blocks the fuel line when it is tipped a certain way. Might be what's happening here.

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I have a CS4518 Earthquake chainsaw that will crank fine when you pump a little gas to the carb, but stops as soon as it burns the gas. I have replaced all fuel lines, primer bulb , cleaned the carb and...


Hi, OK firstly when you pump the primer bulb the primer bulb pulls fuel from the reservoir and pushes it to the carb then after around six to ten pumps the carb chamber is full and the fuel then goes back to the feservoir. Normally if you have a leak on the fuel line you get air in the priming bulb. Next thing is having primed Put the choke on full and pull the engine over a few times untill you hear it fire. Then depress the throttle and put the choke lever back to normal run position and pull the starter a couple of times untill it starts. Thats a pretty fool proff method on all two stroke machines and I have a few. Hope that is of some help.
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Carburetor change


Primer bulbs pull fuel from the carb, into the bulb and dumps it back to the tank, if you have re connected the hoses to the primer the wrong way around it will try to force fuel into the carb and make it flood.

Jun 01, 2013 | Poulan Garden

1 Answer

I changed the primer bulb and now it's not getting


sounds like you hooked the lines up backwards, when you press the primer it is supposed to squirt gas into the tank on the return line cause what it does is draw fuel through the carb and back to the tank....filter line from tank goes to fuel pump side of carb and return line on carb goes to primer bulb then opposite line on bulb to tank...... so when you press bulb it draws fuel through filter in tank through carb and back to tank ! good luck! 2StrokeJim

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1 Answer

I have a Husqvarna 455 about 2 years old. At about 1 year point it would no longer start using the primer pump button on the side when cold. If I take off the air cleaner and give it a a shot of gas down...


Your seeing the problem. Air in the fuel lines usually caused by a cracked fuel line or a pin hole in the primer bulb. Until you can stop the air bubbles by either replacing the actual primer bulb or fuel lines your always going to have the hard to start problem. This can also cause the engine to run lean at high RPM settings and eventually burn a hole in the piston. You should repair the fuel problem ASAP. If you do not find any fuel line / primer bulb problems then it is time to start looking at the carb diaphram.

Thanks for choosing FixYa,

Kelly

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1 Answer

Fuel dont get in carbruator put gas in the carb thru the choke it starts but dies .i put a new gasline in it and a new carb kit Why dose pressure build in the fuel tank i removed the fuel line and gas...


When you prime/puge your carburetor, make sure fuel (w/ no air) is moving from the fuel tank towards the body of the carb. Also, make sure that there is fuel/air bubbles leaving the primer bulb and going back towards the fuel tank...and that when you push the bulb down and release it, there is no fuel movement in either line. If fuel does move when letting up on the bulb, you either have the fuel lines reversed or, the check valves in the primer base assembly are not functioning. The primer/puge valve's funcion is to draw fresh fuel into the fuel pump side of the carb and to push old fuel/air from the metering chamber side of the carb back to the fuel tank. Here is proper fuel routing:
This is an ongoing issue for users, and rightfully so. Small diameter line out of fuel tank (has filter in-tank on end) connects to the side of the carburetor that has the fuel pump....that is the cover without the hole in it. Other larger diameter fuel line out of tank connects to the longer nipple on the external purge/primer bulb. The bulb "pulls" fresh fuel from the fuel tank to the carb and then out of the carb to itself, where it then pushes any air/old fuel back into the fuel tank. The remaining larger diameter fuel line in this setup goes from the metering chamber (has cover with writing on it and a vent-hole) side of the carburetor to the smaller nipple on the purge/primer bulb. Years ago on 2-stroke trimmers, primers were not even used,...you choked the carb with a slide lever and gravity let fuel enter the carb from above...a few pulls, a "pop"...slide it off of choke and away you went.
If the purge/primer bulb is on top of the carb...small line from carb body to small hole in tank with filter. Larger diameter line goes from the bulb on the fuel pump side of the carb to the larger hole in the fuel tank where the line is held in place with a nylon nipple connector that keeps the line from pulling out of the tank.

Sep 03, 2010 | Homelite Garden

1 Answer

Troy bilt gas trimmer gas lines broke and now I'm not sure which lines go where.


The gas lines probably broke because of the ethanol-laced gasoline we have to use nowadays. It deteriorates them. If the unit has the external purge/primer bulb, the way mine did, it is not that hard. Just remember...the primer bulb "pulls" fresh fuel from the fuel tank to and thru the carb, thus pushing out any air/old fuel in the metering chamber of the carb back to the fuel tank in the return line...that said..
Fuel tank...2 lines...smaller diameter line goes directly to the carb body. There are probably 2 brass nipples on the carb. This line goes to the one on the body opposite the end of the carb with the vent-hole in the cover. This is the fuel pump end...where fresh gas enters the carb.
The larger line out of the fuel tank connects to the longer nipple on the purge/primer bulb. This is the fuel return line.
The remaining fuel line (larger diameter) goes from the vented-cover (has writing on it) end of the carb to the shorter nipple on the purge/primer bulb. This line carrys air and old fuel OUT of the carb to the bulb where it is then PUSHED back to the fuel tank via the return line...so you have a small diameter supply line to carb...an intermediate larger diameter line from the carb to the bulb and finally the larger diameter return line from the bulb BACK to the fuel tank.
Go to a small engine shop and purchase about a foot each of the 2 different diameter fuel lines needed and install those new "Tygon" fuel lines as your fuel line replacement.

Jul 09, 2010 | Troy Garden

1 Answer

I have a Sears craftsman lawn mower that will not stay running. The model # in the engine is 12h887-2314-E1. Can you give any suggestion?


Your engine parts list can be found here: http://www.briggsandstratton.com/maint_repair/manual_and_more/docsearch.aspx?enginelookfor=12h887-2314-E1

There are 3 different carb variations on this unit.

Primer type
Choke type
Auto-choke type?

On the Primer type with the plunger on the side of the carb the primer bulb gets a pin hole in it that allows air to be drawn through the primer bulb. So the engine will start an then die after priming.

On the Choke type carb debris in the bottom of the float bowl AND bowl nut will cause this.

On the Auto Choke type there is a diaphram under the carb that can get damaged and allow airflow where there should be fuel flow.

I am pretty sure that your mower has the float bowl on it. remove the bowl nut... take some carb cleaner and spray directly up into the hole the bowl nut screws into and clean it. Then also spray around the float needle.

If your still having problems.. just fro grins remove the fuel supply line to the carb and check for fuel flow. If there is little or no flow either the fuel slector is off or the fuel tank outlet has debris covering the tank outlet hole inside the gas tank.

Thanks for using FixYa.

Kelly

Jul 04, 2010 | Garden

1 Answer

Engine wont stay running


It is a diaphram carb. Doe's the primer **** straight gas or does it have air bubbles in it? If it has bubbles in it then it is a leak in the fuel line.
If not then Unhook the intake fuel line and pump the bulb until all of the gas is out of it. Then pour the gas out of the tank and rinse it out with new gas. Pour in new gas and it should be ok.

May 23, 2010 | Briggs & Stratton Power Products 1539...

4 Answers

Ryobi 725r 31cc


Ryobi is Japanese for "Piece of ****" My suggestion is to throw it out!
My 767r has had fuel line and carb trouble from day one. I'll never buy another Ryobi or Craftsman tool again.

Jun 13, 2008 | Ryobi 15" Electric Factory Reconditioned...

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