yamaha golf cart will not keep a prime in fuel system

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  #1  
Old 08-24-14, 10:52 AM
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yamaha golf cart will not keep a prime in fuel system

first off, thanks for taking the time to stop by and help ! I am post this for a very good friend, he has a yamaha golf cart and it is gas not electric. over the past few weeks we have been scratching or heads and wallets over this cart.what happen was this.....it quit running so through the process of elimination we fould out the fuel pump was bad and we replaced it. It ran fine for a couple days then the wifes all went for a ride and ran it out of gas........ever since that we have not been able to get it to run again unless we pour gas into the carb. We have cleaned out the carb bowl, replace ALL lines that go from fuel tank to pump and subsequently to the carb, including the line that goes to the engine . we cleaned out the fuel filter (it was replaced with the fuel pump two weeks ago). if we take off the line going from the pump to the carb and turn the engine over gas steadily pours out.............any thoughts?
 
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Old 08-24-14, 12:43 PM
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Welcome to the forums!

Did you check to make sure you have spark?
 
  #3  
Old 08-24-14, 12:57 PM
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What model or year cart is it? Yamaha has made golf carts for over 30 years from 2 strokes up to 4 strokes and EFI.

You say the engine will not run unless you pour fuel in the carburetor. After it starts that by pouring gas in the carb will it keep running thereafter?
 
  #4  
Old 08-24-14, 02:25 PM
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yes, it has spark, it is NOT efi i believe it is a 1999 roughly give or take a few years either way.............the fuel delivery system is very basic, tank , filter, pump and carburetor
 
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Old 08-24-14, 06:55 PM
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additional info.............its a G16 A 1997
 
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Old 08-24-14, 06:58 PM
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only long enough to burn up the gas that has been poured into the carb..........
 
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Old 08-24-14, 07:36 PM
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Sorry , missed the part of pouring the gas in the carb.

If the pump gets fuel to the carb fine, and the motor runs when you put fuel in the carb throat, you must still have an obstruction in the carb.
 
  #8  
Old 08-25-14, 05:45 AM
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Yep, sounds like a carburetor problem. Pouring gas into the carb and the engine runs verifies that the engine (compression & ignition) are OK. Disconnecting the fuel line and having fuel come out in a stream when you crank the engine confirms that the fuel pump and piping are OK. That leaves the carburetor. It's a Mikuni so it is repairable but probably just needs a good cleaning. If you are careful you won't even need new gaskets.

If you consider purchasing a new carburetor be wary of the ones costing less than $150. They are Chinese clones and I've seen some with extremely poor quality. All I've seen have been good enough to get the engine to run but some have poor throttle control and just aren't "right". You'll probably have to go to Yamaha or a Yamaha dealer to order the OEM Mikuni which will be double the cost but will make the cart run like new.
 
  #9  
Old 09-07-14, 10:32 AM
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it was the carb........we took it off and took it apart and thoroughly cleaned it, now it runs great. thanks to everyone who took the time to help!
 
  #10  
Old 09-07-14, 12:42 PM
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Save the old carb. It can be a useful source of parts in the future.
 
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