115 mercury outboard loses power

[benry2537]

We have a 24' pontoon with a 2005 115 mercury ELPTO model # 1-115412DD Since we bought it from the dealer it has not run properly, after running for about 1/2 hour it starts to cut out.... like its not getting gas, if you pull it into neutral wait a second or 2 then throttle it open it will pick back up and run for a while but starts cutting out again, drops from 5000 rpms down to 2000 or 2500 at times sometimes it will go to 3000 rpms. We have had it back to the dealer many times this is what they said they did, ck'd for spark & compression-OK, ck'd fuel line for internal collapse-OK, lake tested found spark was good & would run with primer bulb constantly pumped, they removed all carbs and cleaned, ck'd fuel pump said it ran good when they tested it however it did not...left us dead in the water, back to dealer they replaced the CDM module assem. boat seemed to run ok for a while but now it is back to cutting out .....Does anyone out there have any idea as what could be causing this....we put on a new fuel line and ball

[boats.net]

Sounds like a fuel pump or fuel line restriction. It is hard to say.