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Old 07-02-2008, 02:15 AM   #1
Lt. JG
Join Date: Jun 2006
Location: Collierville, Tennessee
Posts: 17
Default Loss of RPMs on 2700 SCR 5.7L MPI B3

My engine will not go over 3700 RPM out of the hole at WOT. I cannot get on plane even with the trim tabs. I sometimes even lose a few RPMs. Used to peg 4600 out of the whole and on plane in about 40 yards with a top speed of 38 mph. New plugs, dist cap and fuel pressure checks close to 50 lbs. No water in fuel even added SeaFoam to be sure. Fresh gas. Could it be an exhaust problem? Could the flappers in the exhaust stick and cause this problem?
Please help.

Peace Keeper (mmccaslin)
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Old 07-02-2008, 04:36 AM   #2

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Join Date: Nov 2005
Location: Everett Wa
Posts: 4,681
Default the tank is a pickup tube with a screen...if that is crapped up..your not going to get enough gas no matter what pressure you have....the other thing to check is the tank vent tube....if that's plugged....same thing...a vacuum forms and you can't get up on check if it's the fuel fill port...go out and run the boat....betcha the rpms comes back then.....
one other item....what does the hull look like??? any slime or crude on the bottom???..your not going to make plane if that is there....

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