Sounds like fuel is vapor locking in the fuel rail to the injectors. Try to cycle the key on for 2 seconds (without cranking the engine) and do this 10 times then try to start the engine. If this works, and I think it will, what you are doing is using fuel pressure to purge the fuel vapors from the system up to the injectors and replacing it with liquid fuel. You may want to give it a short crank on the 5th cycle to allow fuel vapors to be purged through the injectors and depending on how much vapor there may be in the system it may even start at that time.

 

Sounds like fuel is vapor locking in the fuel rail to the injectors.

Yep.

UTV Inc. makes a sweet little aluminum heat shield to protect the rail for turbos. That would likely do the trick for you long term. Just bolt it on. You'd have to ask for a part number, or look around their site. You could probably fab something up if you wanted to mess around with it. Theirs is nicely formed and fits perfectly around the fuel rail.

 

I have the same problem right now. Been fighting it for some time. Everything seems to point to vapor lock. im gonna try the heat shield thing.And maybe wrap the fuel rails with header tape. I just cant figure out why they ALL dont have this problem.

 

I have had luck with letting the motor idel for about 30 sec after I stop then shuting her down.

 

Yep let it run till temp drops back to 194 and fan cuts off and it will start. It's been talked about in another thread. Hard to start when warm i think is the topic. You might try and search for it,Kerry:ride:

 

Ok, Went riding today. I tried turning the key on and off 10 times. it worked once. it was a little chilly out so i let it sit til the temp dropped below 188 degrees. Then it would start. im building a heat shield and wrapping them. it seems like the only real solution

 

Might try ethanol free gas. Might make a big difference.

 

Hmmm....maybe its time to check the fuel pump pressure and see if the pump isn't part or all of the problem?

Just a thought...easy to do...

Pirate

 

Agree with Pirate - check fuel pressure. If that turns out to not be the problem, there is another thread about this problem either on this forum or on the 800 forum. A dealer talked with Polaris about it. Here is what they recommend.
1) Don't use oxygenated fuel (use non ethenal fuel).
2) Don't shut off the engine when the fan is running - wait until the engine cools down and the fan stops.
3) If the stop is going to be less than 20 minutes, leave the engine running for the length of the stop.

Mike

 

They actually said this is the fix just leave it running? Just think if the auto manufactures were to say something like that. The world would stop spinning. It is hard to believe some of the dumb ways they try to get out of actually fixing the problem.

 

Its the heat. and i think i know why. My rzr is snorkeled . The old cvt exhaust has been removed. It used to blow air under the bed which used to cool it a bit. Polaris did this to keep the bed from getting so hot. When i was out the other day i tried turning the key on and off ten times. That worked once. i tried shutting it off when the fan quit running. That worked once. The only thing that worked every time was waiting til the temp gauge dropped below 188. More like 185. Then it started. im making a shield and wrapping the fuel rail with header tape. That should solve it. Or installing a fan but thats not the permanent solution . And if there is a bunch of mud on top of the engine , I imagine that doesnt help things either.

 

Just a side note my 500 efi Ranger was exactily the same way as my RZR. It is as simple as letting it idel for 30 seconds before you kill it.

 

Ya right!! like everyone wants to hear your machine running everytime you stop to B.S.

as for leaving it run for 30 seconds. It didnt work for me.

 

Hmmmm...I...

If the cooling fan is on, I wait until is shuts off to shut down the motor.

When ever I stop, I let the motor idle for 30 seconds or so and shut it off. My belief is that if I let it idle for 20 minutes, there's a lot of heat being generated under the bed, and no movement of air to help disapate all that heat!

When mine wouldn't start easily after this type of shutdown, I tested the fuel pump...yup not up to par. New pump, no hot start problems.

JMO

Pirate

 

This is a problem with your fuel pump. Trust me, when this happened
to mine, I checked the t-map sensor, tps, changed air filter, changed
spark plugs, drained gas and refilled with non-ethanol. I finally
checked the fuel pressure and it was only a bit low. I went to a buddy
and swapped pumps with him, and it fixed the problem. I know many t
things may vary but if you have this problem, start with fuel pump!!!