I have a UTV Inc. bed plate, which is easy to remove and give access to the engine compartment. Its actually easier to get to the fuel rail than it is to take the seat out to get to the pump!
I have found that if you test the pump, replace the pump, then turn the key on, the fuel rail pressurizes to 39 psi. If you start the engine...it stays at 39 psi. The pump has the capability to push more fuel than the injectors can use. So you can test with the engine off or the engine on.
Is the "however its spelled" valve at end of the fuel rail...towards the back of the RZR past the throttle body?
I believe NAPA or Ace Hdwe or someone that carries a lot of brass fittings will have a fitting that screws onto a valve stem and then converts to pipe thread. From there you can adapt to whatever you are using for the test kit.
RV shops may also have something that's used for blowing out water systems for winterizing.
I attach the test set up to the end of the fuel rail and clamp it.
Then turn on the key and check the pressure.
I've started the RZR and the pressure remains the same.
I've caught all kind of S*^* over past days on a "pressure regulator". If there is one, and I guess there is, then the pressure regulator must set the 39 +/-3 psi. A failing pump doesn't get there.
So I think my answer to you is that the pressure regulator does what its supposed to, by maintaining the 39 psi. If the test gauge reads low...then its the pump. Learning that there is a regulator makes me wonder if there is a chance the regulator can fail...causing low pressure, by relieving too much. Or as the other post, the pressure was too high.
Really not sure how to test the pressure regulator.
If you dont mind pls. It sure would come in handy. Just went to the local Napa store and tried buying everything I needed for my fuel pump pressure kit. Didn't have anything separate. He tried selling me one for $80.00. I ran out. Lol. Im looking into oreillys and it looks like they have what I need. I also looked into the fuel pump and it looks like E8335 is the one. I have 2011 rzr 4 800 eps robby gordon. Hope I get my baby up to speed.
had a question , hooked up pressure gauge as described above. pressure when up to 43.. when i rev the machine the pressure drops down 5 or6 psi ... is this normal ?or should it stay at 45 no matter what ?
I also have a 2011 robbie gorden 4 seater .. i couldnt find a thread on an aftermarket pump ... is this suppose to be a replacement ? E8335
thanks again for this post pirate .. helped alot...
Good response Chris! I'm really not sure how much the pressure is designed to drop when an injector opens.
But I would not recommend starting the motor with the fuel pump test set attached. Heaven forbid, if the test set blew off the end of the fuel rail, you would have a lot of gas blowing out right on to the exhaust headers...and that would be disastrous!!!!
The pump test set up is just a means to be certain the pump is delivering enough fuel at enough pressure to meet spec at the fuel rail, and thus at the closed injectors.
Question, mine is feeling very hot after riding around 45 mph for about an hour. Temp. Outside was around 50 degrees. When I take off in H or L I have to gas on it some or the Polaris acts like it is staining some to get going. Is this normal, or do I need to get it looked at? Thanks for any advice?
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