1997 Mercury 150 efi Lunges under load

W

wdel9

Cadet
Joined
Jun 21, 2008
Messages
6
I have a 1997 Mercury V6 EFI 150 HP. Starts fine, runs great at idle. When I increase idle past 1200 rpm the boat wants to lunge. It lunges then backs off then lunges and backs off. It does not die. When I back off the throttle the boat cruises at slow idle perfectly. I suspect fuel related problem. I took off the fuel seperator filter cannister and dumped into a pan. No water in the fuel and fuel seemed to be clean. The boat has a hand pump primer bulb and gets hard when pumped. Seems to hold pressure. Please advise me of problem or ask questions. What is VSP and how do I check this?
Thank you,
wdel
 
R

Ram57

Cadet
Joined
Jun 19, 2008
Messages
13
Re: 1997 Mercury 150 efi Lunges under load

VST - Vapor Seperator Tank. In the VST is another fuel filter sounds to me like that is your problem. If you have never changed the fuel filter in your VST then its probably whats causing the restriction at higher RPMs.
 
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