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ryanagler replied to the thread 2018 Mercury 40 EFI – rhythmic RPM surging at WOT after 5 minutes – video.

Thanks for the suggestion, I just ordered a gauge, should be here Friday. My understanding is there is a Schrader valve to attach it...

Yesterday at 4:02 PM
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ryanagler reacted to alldodge's post in the thread 2018 Mercury 40 EFI – rhythmic RPM surging at WOT after 5 minutes – video with Like.

My first thought is weak fuel pump I would suggest putting a pressure gauge on it to see if it's falling off

Yesterday at 4:00 PM
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ryanagler posted the thread 2018 Mercury 40 EFI – rhythmic RPM surging at WOT after 5 minutes – video in Mercury & Mariner Outboards.

Serial 1C563963, runs perfectly for ~5 minutes at full throttle, then RPM oscillates very rhythmically about 2 cycles/sec, no warning...

Yesterday at 1:01 PM

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