Fuel Pump Or Vapor Lock? - Yamaha Rhino Forum - Rhino Forums.net
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post #1 of 17 (permalink) Old 07-01-2019, 12:26 PM Thread Starter
Oil Spot
 
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Fuel Pump Or Vapor Lock?

New to me Rhino, 2006 Rhino 660 that I’ve been figuring out one issue at a time. First issue was the long crank time to get fuel to the carb before it would start. My solution was to install a marine primer bulb and it worked great! Started right off after that.

Next was the temp light coming on. Bled the system, topped it off with coolant and installed a radiator cap which now includes a temp gauge. Fan comes on around 140 and cycles as it should. The temp got to 200 but never shut the engine off nor did the light come on. 140 seems low to me?

So the next issue is this.... this weekend it just died like it did when the temp light was on but no temp light this time - it just died? Both times the fuel tank had about 1/4 of a tank left when it did it. Anyway It just turned off like I turned the ign switch off, would just crank after that. Let it sit for 20 mins and fired right back up. I also checked the marine primer bulb and she was flat. The next time it quit I pumped it up using the bulb and it ran fine for a few minutes then died.

No temp light came on though? Does the 660 turn off when overheated? No coolant leaks, everything looks fine. Is it possible to be a Fuel pump issue or low fuel pickup issue maybe?

Any help would be greatly appreciated !!! Thanks in advance!!
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post #2 of 17 (permalink) Old 07-01-2019, 12:32 PM
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Quote:
Originally Posted by mcdenney View Post
New to me Rhino, 2006 Rhino 660 that Iíve been figuring out one issue at a time. First issue was the long crank time to get fuel to the carb before it would start. My solution was to install a marine primer bulb and it worked great! Started right off after that.

Next was the temp light coming on. Bled the system, topped it off with coolant and installed a radiator cap which now includes a temp gauge. Fan comes on around 140 and cycles as it should. The temp got to 200 but never shut the engine off nor did the light come on. 140 seems low to me?

So the next issue is this.... this weekend it just died like it did when the temp light was on but no temp light this time - it just died? Both times the fuel tank had about 1/4 of a tank left when it did it. Anyway It just turned off like I turned the ign switch off, would just crank after that. Let it sit for 20 mins and fired right back up. I also checked the marine primer bulb and she was flat. The next time it quit I pumped it up using the bulb and it ran fine for a few minutes then died.

No temp light came on though? Does the 660 turn off when overheated? No coolant leaks, everything looks fine. Is it possible to be a Fuel pump issue or low fuel pickup issue maybe?

Any help would be greatly appreciated !!! Thanks in advance!!

Recommend you review the multiple threads on 660 performance issues - this forum is plum full of issues and remedies for the 660.
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post #3 of 17 (permalink) Old 07-01-2019, 02:30 PM
JVT
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the fuel pump sucks fuel from the tank. so the line between the stock pump and the tank is a vacuum line. so it will not show any leaks . it sucks in. if restricted at the tank end that bulb you put in will collapse if installed between the pump and tank.

this line must be good or it will cause a long start.
i would check in your tank and make sure none of your connections are loose. look in your tank .rhinos are good for getting dirt in it.

jim
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post #4 of 17 (permalink) Old 07-02-2019, 07:23 AM Thread Starter
Oil Spot
 
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Yeah I have read many of the numerous posts on the 2006 Rhino 660 issues. Sometimes they are helpful if you find the right one.


The primer bulb is installed between the tank and carb. It does not collapse but also it does not keep the bulb tight with fuel. When it dies I hit the primer bulb and pump it back up and it starts right up. The primer bulb really took my long cranks down to 1-2 cranks max. It seems to me that it dies when the fuel tank is more towards empty rather than full of fuel like say 1/4-1/3 of a tank left.


I guess if it was a vent issue on the tank it would do it all the time?
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post #5 of 17 (permalink) Old 07-02-2019, 01:11 PM
JVT
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I owned one of the first rhinos #255 I just recently sold it. if you think venting is the cause . loosen the fuel cap. I never had a starting issue on mine.

I would try to look in the tank and see if it is clean.
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post #6 of 17 (permalink) Old 07-02-2019, 06:50 PM
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You said in post primer bulb installed between tank and carb? did you bypass fuel pump?
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post #7 of 17 (permalink) Old 07-02-2019, 08:02 PM Thread Starter
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Actually it’s the fuel tank, primer bulb then the fuel pump. I have it mounted behind the passengers seat on the roll bar towards the drivers side. The fuel pump looks relatively new so I wonder if there were issues like this before.
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post #8 of 17 (permalink) Old 07-03-2019, 10:00 AM Thread Starter
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Quote:
Originally Posted by JVT View Post
I owned one of the first rhinos #255 I just recently sold it. if you think venting is the cause . loosen the fuel cap. I never had a starting issue on mine.

I would try to look in the tank and see if it is clean.
I am going to check and make sure the tank is vented and not stopped up if I can. Is the vent in the gas cap, coming off the tank, in what they call a rollover valve or somewhere else ???
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post #9 of 17 (permalink) Old 07-04-2019, 03:33 PM Thread Starter
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Traced all the lines coming out of the tank. And I think I found how it’s vented. One thing I noticed was the roll over valve when in the correct up position didn’t seem to allow air to flow through all the time. I really had to shake it around to try and make it work - is that normal? Anything that I can be done to clean it or should I just replace it? The line going into the frame was open. There is also what seems to be a vented cap? Interesting that I heard some air rushing in when I took the cap off so I think that might my issue - venting that is.
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post #10 of 17 (permalink) Old 07-04-2019, 05:53 PM
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Quote:
Originally Posted by mcdenney View Post
Traced all the lines coming out of the tank. And I think I found how itís vented. One thing I noticed was the roll over valve when in the correct up position didnít seem to allow air to flow through all the time. I really had to shake it around to try and make it work - is that normal? Anything that I can be done to clean it or should I just replace it? The line going into the frame was open. There is also what seems to be a vented cap? Interesting that I heard some air rushing in when I took the cap off so I think that might my issue - venting that is.

Replace the cap - I think you may have found your issue.
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post #11 of 17 (permalink) Old 07-05-2019, 07:03 AM Thread Starter
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I would agree with the cap but also Shouldn’t the roll over valve when in the up position allow air to flow freely through the valve? I had to really work at it - shake the valve, bang it on something etc to air to flow through it. That didn’t seem right to me.
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post #12 of 17 (permalink) Old 07-05-2019, 04:58 PM
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Quote:
Originally Posted by mcdenney View Post
I would agree with the cap but also Shouldnít the roll over valve when in the up position allow air to flow freely through the valve? I had to really work at it - shake the valve, bang it on something etc to air to flow through it. That didnít seem right to me.

Sounds like it may also be faulty although I'm not real familiar with them.
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post #13 of 17 (permalink) Old 07-05-2019, 09:59 PM
JVT
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I don't think the gas cap is suppose to vent
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post #14 of 17 (permalink) Old 07-24-2019, 03:03 PM
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Hope you straighten out your problem..that's why clear fuel line is nice, you can see what is and isn't happening..
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post #15 of 17 (permalink) Old 07-24-2019, 07:24 PM Thread Starter
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I’m honing I’m on it as time permits. It’s interesting that recently it dies and seems to run out of fuel only when idling. I’m thinking it could be the roll over valve possibly but I’m almost certain I need to insulate the fuel lines. Just haven’t done it yet.
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