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  #1  
Old 06-19-2013, 04:18 AM
emtigene emtigene is offline
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Can I do away with fuel solenoid?

I have a Kawasaki FX730V, 26 HP, only 62 hours. Engine will not run, installed new plugs and new fuel pump. With talking to mechanic and online research I am thinking the solenoid is not working. With a price tag of around 130.00 I am wondering if I can do away with it and if so how to go about it. I would greatly appreciate any help you could give me.
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Old 06-19-2013, 06:44 AM
BleedingGreen BleedingGreen is online now
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You should hear a click when you turn the key to the run position (don't crank just run position) from the fuel solenoid. This click is the fuel solenoid opening. You can also bench test this with 12 volts. I've even used a 9 volt battery. When the fuel solenoid sees power the plunger retracts allowing the fuel to flow. It might not be a bad idea to take it out anyway to see if there is debris blocking it too.
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Old 06-19-2013, 06:46 AM
BleedingGreen BleedingGreen is online now
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Oh and to answer your question, in theory yes you could bypass the fuel solenoid. Either remove the plunger from the fuel solenoid or if you had a safe way to block the opening where the fuel solenoid would be if you removed it (not recommended) . All the fuel solenoid does is prevent fuel from flowing while shutting the engine down to prevent backfiring while the engine is still turning but the ignition is off since the created vacuum is pulling fuel.

Last edited by BleedingGreen; 06-19-2013 at 06:53 AM.
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Old 06-19-2013, 07:17 AM
dboyd351 dboyd351 is offline
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Quote:
Originally Posted by BleedingGreen View Post
Oh and to answer your question, in theory yes you could bypass the fuel solenoid. Either remove the plunger from the fuel solenoid or if you had a safe way to block the opening where the fuel solenoid would be if you removed it (not recommended) . All the fuel solenoid does is prevent fuel from flowing while shutting the engine down to prevent backfiring while the engine is still turning but the ignition is off since the created vacuum is pulling fuel.
BleedingGreen - sort of a question/comment - I was wondering if the solenoid would also keep all the fuel from draining into the crankcase if the needle seat failed in a float bowl carb? I recently had all the fuel drain from the gas tank into the crankcase on a motorcycle because the needle valve controlling flow into the float bowl got stuck open. Seems like the solenoid would have prevented this - No?
Either way, it isn't something you need unless you have a float bowl carb and your needle valve fails.
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Old 06-19-2013, 07:49 AM
taxidermist taxidermist is offline
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Take it apart and clean /lube it. I dont see many go bad but I do find a lot of them stuck.


Rob
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  #6  
Old 06-19-2013, 09:05 AM
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BigFish BigFish is offline
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Quote:
Originally Posted by dboyd351 View Post
BleedingGreen - sort of a question/comment - I was wondering if the solenoid would also keep all the fuel from draining into the crankcase if the needle seat failed in a float bowl carb? I recently had all the fuel drain from the gas tank into the crankcase on a motorcycle because the needle valve controlling flow into the float bowl got stuck open. Seems like the solenoid would have prevented this - No?
Either way, it isn't something you need unless you have a float bowl carb and your needle valve fails.
The "fuel solenoid " as it is used on most all small engines, only controls/stops the gas from entering the main jet/nozzle. It usually is called an "anti- afterfire" solenoid in most IPLs.
It has nothing to do with fuel flowing thru the inlet needle and seat. In most cases, if the float/needle gets stuck in the open position the carb will still overflow and fill the crankcase with gas!

And yes, all ya gotta do is snip the end/tip off the solenoid.
It helps to stop the backfire if you let the motor idle down a bit to cool off before shutting off.
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Old 06-19-2013, 09:59 AM
emtigene emtigene is offline
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Thanks guys. It will be this evening before I can try that. It makes sense that a small amount of fuel is still getting thru when setting as after it sets awhile it will start and run for about 2-3 seconds. I will let ya'll know if that is what the problem is.
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Old 06-19-2013, 11:13 PM
emtigene emtigene is offline
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So I took off the solenoid and held my finger over the hole while my son started the engine (not recommended). It fired up immediately and run fine. We cut the plunger off and reinstalled solenoid, mower is running like new. Thanks again for the replies to my questions.
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Old 06-19-2013, 08:58 AM
BleedingGreen BleedingGreen is online now
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Dboyd351- typically no. The fuel solenoid does not create a 100% seal. You would think it does due to it's name and purpose but typically the main jet also has other ways(slots, holes, etc.) of allowing fuel to continue to flow, usually beacause of gravity I.e. fuel tanks, lines, etc. that are higher than the carb. Even faulty fuel shutoffs. So if you have a needle and/or seat problem, while slow will still allow your condition to occur.
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Last edited by BleedingGreen; 06-19-2013 at 09:03 AM.
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Old 06-19-2013, 11:16 PM
BleedingGreen BleedingGreen is online now
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Good glad to hear it. Curious to know if it actually failed, debris, electrical problem, etc though. Glad it's running again!
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