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Discussion Starter #1
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.

2005 sportsman 700 efi.

Thanks in advance.
Bob
 

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Lean conditions can lead to a hot exhaust I believe! But I've been wrong MANY times before!
 

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Discussion Starter #3
Fuel Pressure

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.
 

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Fuel Pressure

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.
 

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Can buy pump from Napa , o'reilly;s ect airtec #E8198 Carter #E7000 around $100 not sure on regulator have only changed the pumps
 

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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.
 

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I hope he has it fixed by now. This thread was started four years ago. :D
 

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