Loss of power above 2500 rpm

DonHarv

Recruit
Joined
Aug 26, 2018
Messages
3
I have a 1999 fourwinns 245 with a 5.7 sx Volvo penta system
With a full boat I can no longer get up on plane. It seams to starve for fuel. If it was a car I would look for a restricted filter.
i have replaced the fuel flow valve,high pressure fuel pump, checked timing.
until approx 2500 rpm it seems to work fine but dosen't have the torque to pull the boat up on plane
any suggestions
 

Fishhead-1

Petty Officer 2nd Class
Joined
Oct 10, 2003
Messages
110
What model engine? You said you changed high pressure pump so is it a 5.7 Gsi or Gxi a throttle body engine? Any beeping sound like it's in protect mode?
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
70,465
Ayuh,...... Welcome Aboard,...... Seein's yer askin' this question in January, I'm gonna assume this boat is somewhere warm,.....

That said,..... How much sea life is hangin' out on the bottom of the hull,..??
 

Grub54891

Vice Admiral
Joined
Jun 17, 2012
Messages
5,908
Ran across a similar issue twice this summer, two different boats. Got ahold of Volvo, directly they had me checking all kinds of different stuff. Finally I simply changed the sparkplugs, the problem went away. The plugs I removed looked fine though. For the 2'd boat, I just went directly to the plugs. Done!
 

Scott Danforth

Grumpy Vintage Moderator still playing with boats
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Jul 23, 2011
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47,304
What motor

What is your fuel pressure?

What does Rinda tell you?
 

DonHarv

Recruit
Joined
Aug 26, 2018
Messages
3
I'm new at this
it is a throttle body injection
i am in nj and the boat is now winterized
I'm trying to get an idea for the spring
I have done nothing with the injectors - they are original
 

QBhoy

Fleet Admiral
Joined
Mar 10, 2016
Messages
8,286
Good common cause of this is the pick up from the tank getting clogged. Gets worse the more throttle applied with the suction increase. Have a look. Likely the bottom of your tank is crappy.
 

DonHarv

Recruit
Joined
Aug 26, 2018
Messages
3
I have checked fuel line pick up in tank - clean nothing on the screen and changed the fuel back flow valve.
i will need to recheck the high and low pressure in the spring
 
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