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I bought this 2009 Yamaha 700 rhino brand new. It was just used around the property and has less than 100 miles on it. I drain the fuel in it once a year and put a new fuel and stabil in it. A week ago I want to replace the fuel and it will not idle without stalling every two minutes. Sometimes she’ll start right up and others times you have to crank it for a long time. It acts like it has dirty jets if it had a carburetor. I am new to this fuel injection system on this Rhino. I believe the two main components are the fuel pump and the fuel injector itself. I am just wondering what steps I should take on troubleshooting this problem. Thanks in advance everybody, I really appreciate it.
 

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Thanks, I will pull the pump assembly out and check the filter. Can the filter be cleaned or should I just replace it if it’s dirty? All the lines look good that I can see, could it be a line inside the tank? Thanks again.
 

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I am just going to order a new filter tonight like you said it’s over 10 years old, any recommendations where to get it from. Thanks
replace it. You can get them at any auto parts store. Take the old one with you so that you can be sure that you get one with the right size intake outtake. Also if the fuel lines are original which they probably are, you should replace all of them including the pickup tube in the tank. While replacing the lines, switch the short one from the filter to the pump with the long one from the tank to the filter. This will allow you to have the filter sitting on top of the tank. This will make it much easier to replace the filter. Also, while doing this, you might want to take the tank out and clean it out. You will need to syphon out all the gas. You can't remove the tank with gas in it without spilling it everywhere. I washed it out with water, then poured a couple of ounces of Sea Foam in it, splash it around, and poured it out. I did the Sea Form part a couple of times. Every couple of tanks I run Sea Foam in the gas, 1 ounce per gallon of gas. You could run fuel injector cleaner instead.

If you don't replace your fuel lines and clean your tank, you might want to get a couple extra and keep one in your Rhino. i have a lidded box I keep in the bed with a tool kit, fuel filter, electric fuel pump and other stuff I think I might need. I replaced the crappy stock pump with an electric one off of amazon. It mounts where the stock one was. It was only $10, so I keep an extra. Actually I think your 700 has an electric fuel pump already.
 

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Thanks for all that great information. I believe the pump and filter are in the gas tank. When I put in an in-line gas filter can I remove the gas filter that’s in the gas tank? Is there any way to check pump pressure or the injector? l think the pump should have at least 40 psi or over. Thanks again.
 

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Thanks for all that great information. I believe the pump and filter are in the gas tank. When I put in an in-line gas filter can I remove the gas filter that’s in the gas tank? Is there any way to check pump pressure or the injector? l think the pump should have at least 40 psi or over. Thanks again.
If what you say is true about the pump and filter being in the gas tank on your Rhino then ignore everything i said. My antique 04 660 is carbureted and had the old crappy rubber diaphragm fuel pump. Someone on here with the fuel injection system knowledge should answer shortly.
 

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Thanks you for the information, I wished it had a carburetor, It would probably be easier to work on. I really don’t want to bring it to the dealer if I could fix it myself. Thanks again
 

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"I wished it had a carburetor" .. no you don't!. You've got somewhat of a unusual problem for a 700 (FI) but once you figure it out you'll be much better off than the carb units. Kinda sounds like, as stated above, a plugged fuel line system likely due to just lack of use. How does the fuel smell - fresh or stale? If stale then by all means remove the tank and flush it and the lines out with a fuel system cleaner such as Chemtool B12 (available at autoparts and some Walmarts) a very potent fuel system cleaner. Can't find Chemtool then go for Seafoam. Also before you do all this check YouTube on how to remove the fuel line at the throttle body. With the line disconnected have someone turn the key on while you monitor how much and how clean the fuel is - you'll only get a short burst turning key on - this is to prime the system. Cranking the engine over should send a strong steady pulse of fuel to whatever container you have the loose end of the hose pointed in. If the fuel squirt is strong, smells good (like fresh fuel) and is clean then you may have other issues. Perform the above and get back to us (please) and we'll go from there.
 

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Thanks sandbuster, the fuel tank was drain every year and new fuel and stabil was added. I also drove it a little to get the new fuel into the injector. The fuel I drain out smelled good. I will remove the fuel line and check the fuel flow. Thanks for all that information and I will get back to you.
 

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First thing I would do is replace the plug and do so with an iridium for life. Understand this is not a real Fuel injection system. It is a throttle body injector similar to the original GM Rochester type things. It squirts and atomizes the gas in the throat of the throttle body depending on rpm and location of the crank by CPS. If the nozzle gets a ethanol fuel bogger or piece of trash in it it will do what you describe. Static fuel pressure will build and give it a squirt but residual pressure while running is not enough.
 

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Discussion Starter · #15 ·
First thing I would do is replace the plug and do so with an iridium for life. Understand this is not a real Fuel injection system. It is a throttle body injector similar to the original GM Rochester type things. It squirts and atomizes the gas in the throat of the throttle body depending on rpm and location of the crank by CPS. If the nozzle gets a ethanol fuel bogger or piece of trash in it it will do what you describe. Static fuel pressure will build and give it a squirt but residual pressure while running is not enough.
Thanks so much for the informatio, I will order a iridium spark plug today. I didn’t know it was a throttle body injection. I thought it was regular fuel injection my fault. I will install the spark plug when I get it and let you know if it clears up the problem. I am sure hoping it will. Thanks again
 

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If you still have problem, look for a Youtube on cleaning an injector with a flashlight battery and a can of carb cleaner by spraying the cleaner thru injector. You do have a throttle position sensor and an idle motor also if memory serves and you need to make sure the throttle plate has proper clearance. Get a service manual, it is very helpful, well written.
 

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Discussion Starter · #17 ·
Thanks Jim for the information. The new iridium NGK spark plug just came in yesterday. I installed in and added some fuel injector cleaner to the gas, so far it’s running very good no stalling issue. The old spark plug was kind of black, it could be 4 or 5 years old. Thanks everybody for all the help, I keep you guys informed but I think it’s fixed. Thanks again
 
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