Mercury 200 hp Surging At 6500

[1fastg3]

So I haven This trouble For the last 3 times Out if not more .
It Surges in and out at 6500 to 7100 RPMS ? So I was talking And everyone Said I needed a Electric Fuel Pump So I added a fuel pump and It still does it ? I have 130 psi on all 6 .. This is the pump I got ..http://www.jegs.com/i/Mr-Gasket/720/12S/10002/-1?parentProductId=1196572

[rev.ronnie]

I have been told a bad stator will cause that. Just a thought.

Are the reeds ok?

[Gorilla0178]

First off welcome to my world, did you keep the stock pump too? If not I'm not sure if the 35gph that thing pumps is enough at those speeds. Have someone pump the primer ball while you run and see if that helps....

[1fastg3]

Stock pump it Still On .. I took the primer ball out and added a pump

[Gorilla0178]

I see, not sure then. When I had the same issue with my omc, everybody said check for restrictions. I found that it was just running out of fuel do to a internal problem with the pump. I put a holly style pump in and took the stock one out. It seems to work fine now, but I havent had it out alot since then. Take the pump apart and see if everything is ok inside.

[1fastg3]

Yea I Am broke for the next 2 weeks So I will take the pump off and look ..

[Gorilla0178]

I hope you figure it out, It was a pain in the azz for me.

[1fastg3]

I have been told a bad stator will cause that. Just a thought.

Are the reeds ok?
I was thinking the reeds to ? Could it act like that ? I thought It would have a bad idle?

[johnboy 88 vegas]

Do you have an anti siphon valve on you fuel pickup? If so remove it.

[rev.ronnie]

Reeds will do funny things. If they are leaking, you will lose intake charge. Missing at idle is a sure sign, but not always the only sign. It really does seem fuel related though. Keep it from surging as much as possible when testing, don't drive it into the surge for long, if it's lean, parts will melt!

[eli]

maybe air in the system put in a piece of clear line and watch for bubbles , will do what your describing.

[afr]

its always been the stator for me my old 2.4 did that till i changed out the stator not that high a rpm but none the less it use to surge
im sure you cleaned and drained the carbs

[Forkin' Crazy]

Bad reeds affect more on idle than top end IMO. I can't see how reeds could produce a surge. Sounds like you may have a cylinder coming in and out (ignition)…?

You need to rig a temporary pressure gauge at the carbs--- piped up front so you can verify pressure at speed.

[1fastg3]

I was Playing with my Fuel lines and fuel filter today ... I have bad gas on the engine side of the fuel pump ? Brown ? But from the boat tank Its fine ? I am going to run a clear fuel filter and Run Velocity stacks ..

[1fastg3]

Help Me out here Guy I want going to leave tonight But Cant now Becuase Of the boat ... Alot of guy are thinking its the stator.. But for $300 Its a big guess