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Bud_Man


Joined: Jun 30, 2005
Points: 3

Bad Primer Bulb
Original Message   Jun 30, 2005 11:43 am
Hello,

I recently purchased a YardMan walk behind mower with a 6hp Tecumseh engine.  I think the primer bulb is bad.  When I press it, there is no compression.  My father-in-law purchased one many months ago from a different store and his currently does the same thing.  I realize that my mower is still under warranty and I can take it to a service repair shop, but I was wondering if anyone had experienced this recently with YardMan mowers or Tecumseh engines.  The bulb is red colored and there does not seem to be any obvious defects on or around the bulb itself.  Is there something I can do to troubleshoot and possibly fix it or should I just take it in the repair shop and let them handle it?

Thanks in advance.

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jubol


Location: Dover, De
Joined: Oct 3, 2003
Points: 1558

Re: Bad Primer Bulb
Reply #8   Dec 27, 2005 4:34 pm
Folks,

Make sure the primer hose line has not become disconnected.

If it has reconnect!!

                                                    Fred

Husqvarna STE927(11.5HP) snowblower,  MTD Pro Series 18/42 Lawnmower, MTD 6.5 HP  Self Prop Lawn Mower,  Weedeater 1500 Blower, Web Gensis  2000 
nibbler


Joined: Mar 5, 2004
Points: 751

Re: Bad Primer Bulb
Reply #9   Dec 28, 2005 9:51 am
riverknoll wrote:
Bud Man, same problem here too.  Primer bulb use to have resistence and I can tell when fuel is being pushed into the carb.  Now it feels like pushing air?  Anyone know what the prblem is?

It might also be time to check to see if there is fuel in the gas tank
riverknoll


Joined: Dec 27, 2005
Points: 2

Re: Bad Primer Bulb
Reply #10   Dec 28, 2005 9:41 pm
Fred, I topped off the tank with gas because I was told that the primer was gravity fed and works better with full tank.  Of course, no difference, as I remember previously with minimal gas in tank, primer bulb still worked.

Now what you said about the hose makes sense, as I am hearing air move but can't figure out where.  Took off the side panel and all hoses connected and no obvious mis or loose connections to the carb.  Sounds like the connection to the bulb it self may be loose, but it requires alot of disassembly to get to it, so I want to get some detailed instructions before I proceed. Thanks.

Majorxlr8n


Location: Freehold NJ
Joined: Aug 6, 2003
Points: 1092

Re: Bad Primer Bulb
Reply #11   Dec 28, 2005 11:27 pm
riverknoll wrote:
Fred, I topped off the tank with gas because I was told that the primer was gravity fed and works better with full tank. 


WRONG!

NO FUEL goes thru that tiny primer hose. What happens is that when you activate the primer, it pushes air into the fuel chamber in the carb & pressurizes it. Then, with the fuel under "pressure", it escapes thru the main well tube to PRIME the carb throat with available fuel for the engine to burn immediately.

As long as there is SOME fuel in the tank, the primer SHOULD work. If not, the hose could be loose, disconnected or broken, the atmospheric vent in the carb might be clogged, the primer bulb may have a hole in it (not to be confused with the hole in the center on some primers), or the carb's internals are clogged up.

Hope that sheds some light on the subject...

Marty

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