# 350 Corvette boat engine loosing rpm's when cruising?

**URL:** <https://community.cartalk.com/t/350-corvette-boat-engine-loosing-rpms-when-cruising/17378>\
**Category:** Maintenance/Repairs\
**Created:** [July 29, 2008, 6:08am UTC](https://community.cartalk.com/t/350-corvette-boat-engine-loosing-rpms-when-cruising/17378 "2008-07-29T06:08:41Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![bartyUW](https://avatars.discourse-cdn.com/v4/letter/b/3be4f8/32.png) [@bartyUW](https://community.cartalk.com/u/bartyUW)\
**Post date:** [July 29, 2008, 6:08am UTC](https://community.cartalk.com/t/350-corvette-boat-engine-loosing-rpms-when-cruising/17378/1 "2008-07-29T06:08:41Z")

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I have a 1997 Mastercraft ProStar 119 with a 350 Corvette engine in it. I have recently taken it out of winter storage to find that I could only get about 2000 rpm’s out of it before it “bogged down”. After treating it with seafoam, thinking it might be a clogged fuel filter, I was able to get it to 4000 rpm’s before it gave me no more and once again “bogged down”. I now have changed the fuel filter and the same problem still exists. I can get to around 4000 rpm’s and cruising speed but it slowly looses rpm’s over time and I have to turn off the engine in order to get back up to 4000 rpm’s. I have noticed that my fuel pump is making a very loud screeching loud when running, could it possibly be a bad electric fuel pump?

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**Author:** ![NYBo](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nybo/32/17281_2.png) [@NYBo](https://community.cartalk.com/u/NYBo)\
**Post date:** [July 29, 2008, 1:42pm UTC](https://community.cartalk.com/t/350-corvette-boat-engine-loosing-rpms-when-cruising/17378/2 "2008-07-29T13:42:18Z")

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Sounds like a weak pump that can’t keep up with the engine’s demands under load.