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B&s 18Hp


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#1 Boots02 OFFLINE  

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Posted October 01, 2014 - 04:55 PM

Hello everyone i am in need of some help. I recently purchased a craftsman II with the B&S 18 hp motor. When i got it it would not run. So i put in a new battery and it would crank but wouldnt start. It has oil and i put a little gas in the tank. Still wouldnt start. So i pulled the spark plugs and the were bone dry. I tested them and they were no good. So i will replace them tomorrow and possibly the spark plug wires. So my question is why are the spark plugs dry? the fuel lines are not clogged or anything and the tiny fuel filter on the fuel line coming out of the tank is clean. why am i not getting any gas?



#2 Auburn David OFFLINE  

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Posted October 01, 2014 - 05:10 PM

Probably has a fuel pump on that engine...or the the needle valve in the carb could be sticking..just a couple of things to check.



#3 Auburn David OFFLINE  

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Posted October 01, 2014 - 05:14 PM

Hard to say without knowing the type engine you have.



#4 GTTinkerer OFFLINE  

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Posted October 01, 2014 - 05:14 PM

Several things come to mind:

Possibly you may not have cranked it long enough to fill the fuel lines, fuel pump and the fuel bowl in the carb.

The fuel lines may have deteriorated to the point the pump may be just sucking air.

The fuel pump may not be working.  It is normally on the metal "firewall" between the engine and the dash.  The impulse hose from the block to the fuel pump may be blocked or deteriorated causing the pump not to work or the diaphragms in the fuel pump may have hardened.  Fuel pump could also be built into the carb.

The float in the carb may not be opening the fuel inlet in the carb. 

The jets in the carb may be plugged with debris or water.


Edited by GTTinkerer, October 01, 2014 - 05:18 PM.


#5 GTTinkerer OFFLINE  

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Posted October 01, 2014 - 05:17 PM

Hard to say without knowing the type engine you have.

 

Should be a B&S horizontal shaft opposed twin.  Great engine that really sounds good if it has the dual mufflers.


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#6 Boots02 OFFLINE  

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Posted October 01, 2014 - 05:20 PM

Thank you very much i will have to check all of that tomorrow, i got fed up today lol. Also where is the carb located at? i took the entire back half of the tractor apart and some of th engine apart but i cant seem to see the carb at all maybe im just blind haha



#7 Boots02 OFFLINE  

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Posted October 01, 2014 - 05:21 PM

Should be a B&S horizontal shaft opposed twin.  Great engine that really sounds good if it has the dual mufflers.

Thats the one. i plan on putting dual stacks on it



#8 GTTinkerer OFFLINE  

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Posted October 01, 2014 - 06:19 PM

Hope this helps.

Attached Thumbnails

  • B&S 18 hp hor.JPG

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#9 Boots02 OFFLINE  

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Posted October 01, 2014 - 07:02 PM

Hope this helps.

Thank you very much that's what I needed
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#10 superspeedex OFFLINE  

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Posted October 01, 2014 - 08:32 PM

maybe a switch somewhere on carb that stopps fuel flow if theres now like weight on seat



#11 superaben OFFLINE  

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Posted October 01, 2014 - 09:42 PM

Fuel isses are pretty common if the machine has sat for some time.  Listen to Bill's suggestions.

 

maybe a switch somewhere on carb that stopps fuel flow if theres now like weight on seat

 

Its too old to have a shutoff "anti backfire" solenoid I believe.  But you might be right.  Those things are notorious for sticking after sitting, too. 

 

Ben W.


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#12 larrybl ONLINE  

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Posted October 01, 2014 - 10:10 PM

Not adding much, but the stacks will require cutting the hood, or running without it. And try adding more gas to the tank, the pulse pump is kinda weak and requires some cranking to get fuel to flow. Not too much 5 sec with a 2 min starter cool down.

 

https://www.youtube....-tLIZkrLxjJEtbA

 

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  • HPIM1388.JPG


#13 WNYTractorTinkerer OFFLINE  

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Posted October 02, 2014 - 08:07 AM

Not adding much, but the stacks will require cutting the hood, or running without it. And try adding more gas to the tank, the pulse pump is kinda weak and requires some cranking to get fuel to flow. Not too much 5 sec with a 2 min starter cool down.

 

https://www.youtube....-tLIZkrLxjJEtbA

The Hulk looks nice with the pipes Larry!

 

Pull the air filter off and give it a prime with gas to see if it will start and run a bit..  May be enough to get the pulse fuel pump to get things moving..  Just a thought..


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#14 Boots02 OFFLINE  

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Posted October 16, 2014 - 01:23 PM

ok guys i still cant get it running so i tore it down to where the spark plug wires come out of the ignition coil? is that right? can i replace just the wires or do i need to buy the entire ignition coil and it would come with wires?



#15 larrybl ONLINE  

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Posted October 16, 2014 - 01:54 PM

You need to buy the whole coil pack, the wires are not replacable. I assume the wires were pulled out instead of a "no-spark" condition, in which the coil may not be bad. Many times a bad ignition switch, or safety switch will prevent spark.






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