I have had some problems with my ATV. The dealer said it is a problem with the fuel injection pump regulator. Of course, I decided to check the pressure myself. Here is what I get. I know the manual says the pressure should be 39psi. When I turn on my key and the fuel pump kicks on, I get less than 39psi, close to 20 - 30psi. When I start it, it slowly creeps up. After running it for about 10 minutes, it is up to 70psi and my exhaust manifold is glowing red. Can someone confirm I need to buy a $493 fuel tank/fuel pump? Also, why would the exhaust manifold glow red hot? This is one symptom, as I continue to run the bike, it will start acting like it is starving for fuel, as if a vapor lock occurred.
I know a lean condition causes it to get hot, but the cause is due to the irregular fuel pressure. Am I correct? I believe it is supposed to be 39psi all the time, but mine runs up to 70psi in about 10 min.
when the fuel pressure goes up it atomizes the fuel more, meaning a finer spray mist into the cylinder you will get better mileage,but a leaner mixture will also cause higher temp in the exhaust. Engine timing with the electronics needs to adjust for this and is not set up for it
I have been shopping for a regulator for my bike for a couple days now and no luck except on ebay and somebody else got the bid but u had to buy the whole thing meaning pump/ regulator/ sending unit/ and it was used.but at 45$ thats cheap.If i find one ill post it.
Sounds like you need a new fuel regulator, My 800efi would go up to 52psi and it would run rough and not have same power. I found one at Napa that fits like a dream and holds steady so far at a solid 39psi. Napa regulator part # 2-19679.
I had a high psi problem on my '04 700. I replaced the pressure regulator (w/ the same part # that Russ posted) and it fixed the problem. Change your oil too, I would be there is some fuel in there too as mine had. I replaced the fuel pump while I had it out. Check out this thread for tons more info: http://www.polarisatvforums.com/for...itting-sputtering-dying-when-ridden-hard.html
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