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AnsweredMV 18hp

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bullwinkle
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2019/06/07 08:09:09 (permalink)
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MV 18hp

I turned off my mower, and now it won't start again.  If I dump fuel into the carburetor it the engine will run.  I cleaned out the fuel tank, changed the fuel pump, and made sure the fuel lines were clear.  The air filter is clean, the vent cap in the fuel tank is clear and the spark plugs fire right up until the engine slowly dies.  If I gravity feed fuel by putting fuel in the fuel line ahead of the fuel pump - the engine runs.  I have a brand new clear fuel filter, and it doesn't fill with fuel, (not sure if this is an issue, but I would think so).  Is there a way to bleed the fuel line to get the air out?  Do any of the vents in the carburetor bleed off the air in the lines?  I'm getting so frustrated with this goofy engine.  Thanks
AVB
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Re: MV 18hp 2019/06/07 08:59:55 (permalink) ☼ Best Answerby bullwinkle 2019/06/07 16:55:56
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Need the spec number for the engine and the PN of the fuel pump you used as it sounds like you may have installed the wrong fuel pump. Also make sure that you haven't installed the fuel lines backwards.
 
Either way it sounds like the fuel pump is not working as intended.
bullwinkle
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Re: MV 18hp 2019/06/07 17:00:57 (permalink)
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The spec number for the engine is 58560, and the new pump is a KIPA, and I believe the PN is B075DF26HV.  Everything looks identical on the outside, other than the old pump used a gasket between the pump and engine, and this one uses an "O" ring type seal.  I can't imagine that making a difference though.  Thanks for your response.
 
bullwinkle
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Re: MV 18hp 2019/06/07 17:01:59 (permalink)
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Oh, I double checked my fuel lines and they are hooked up the right way.  There is an arrow by each fuel line port.
 
 
bullwinkle
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Re: MV 18hp 2019/06/07 18:04:38 (permalink)
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I think I may have finally found the issue.  It looks to me like the pump arm that rides on the cam is at a different angle to the mating surface of the pump.  The shape of the arm looks the same.  I believe the arm on the original angles back to the cam more than on the new. 
AVB
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Re: MV 18hp 2019/06/07 20:33:50 (permalink)
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appears to be the correct aftermarket fuel pump. Since you are getting no fuel flow remove the pump and try manually operating it to see if it pumps fuel.
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Re: MV 18hp 2019/06/08 08:23:39 (permalink)
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Thanks for the info, it's helped.
 
bullwinkle
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Re: MV 18hp 2019/06/09 11:17:38 (permalink)
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I re-bent the actuator arm on the fuel pump so it would come closer to the cam in the engine, and that appears to have worked.  Just to think...I diagnosed the problem correctly weeks ago, but due to a part that wasn't quite right, I spent hours looking for another issue that didn't exist.  Thanks again for your help.
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Re: MV 18hp 2019/06/09 14:31:03 (permalink)
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That is one of the problems with aftermarket parts, they don't always work as intended.
 
This is one of the reason I avoid 2 cycle aftermarket carbs.
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