Fuel pressure low? 2011 800 - Polaris ATV Forum
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post #1 of 2 (permalink) Old 12-20-2015, 06:30 PM Thread Starter
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Location: Iowa
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Fuel pressure low? 2011 800

Hey guys
Just want to ask a question about this 2011 Sportsman 800 EFI that I am trying to figure out. Starts only with a lot of cranking cold. Or a squirt of gas in the intake it fires right up. No codes. So I am checking fuel pressure and the manual says 39 plus or minus 3. Doing this turning the key on and off several times it will only pump up to 29 pounds. Now if I run it the pressure will come up to 39. New battery,runs fine when it gets warmed up, not real smooth idling until it is warming up, but runs and has good power when it's warmed up in a few minutes. What do you think? Is this normal for the pressure to be this way? And/or what else could make it to be so hard starting?
PS. New plugs good spark, fuel pressure holds for several hours after its shut off checked the resistance at the temp sensor and that seems right 3.1K ohms at about 50 degrees
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post #2 of 2 (permalink) Old 12-20-2015, 08:39 PM
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Location: New York
Posts: 6,991
If the pressure holds over time then it sounds like the pump isn't building up to the 39lbs fast enough to start the machine properly. I would start with the pump. It doesn't sound like an injector nor does it sound like the filter which is a sock in the tank on the pick up.

2011 Sportsman® 800 EFI
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Polaris front lock n ride cargo box
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CTEK 3300 battery maintainer
added 7 zerks
beefed up wiring harness
OGIO rear bag
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Kolpin Over Fenders
Rigid Industries E-Series 10" flood
Walker Evans struts
NGK Iridium's (2,500 miles on Champion's and they looked great!)
Odyssey Extreme battery PC545

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Last edited by bp405; 12-20-2015 at 08:50 PM.
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