Power surge when the boat pitches.

ppping · 11-27-2008, 12:58 PM

I am losing fuel pressure to my 2000 Yamaha 150 2 stroke whenever the boat starts pitching and the power is above idle. The motor will lose power for a second or two and then surge back to where it should be in sequence of going over a swell.. I have checked the fuel primer ball and it is deflated. Motor runs fine when the water is flat. I have tried draining the fuel filter and the ball looks fine. Any suggestions?

Thanks,

Bart

sosmarine · 11-27-2008, 02:59 PM

Assuming your motor is carburated, could be float level, although this would not effect the primer bulb. Could be the pick up in the tank. If it is in the forward part of the tank, rare, and your fuel level is down, it could sucking air.

The Maintenance Shoppe · 11-28-2008, 11:28 AM

It sound like your antisiphon valve is causing you problems, Or it could be a kinked fuel line or a very dirty fuel/water seperator with alot of water in it.

11-27-2008, 12:58 PM	#1
ppping Senior Member Mingo Join Date: Mar 2008 Posts: 142	Power surge when the boat pitches. I am losing fuel pressure to my 2000 Yamaha 150 2 stroke whenever the boat starts pitching and the power is above idle. The motor will lose power for a second or two and then surge back to where it should be in sequence of going over a swell.. I have checked the fuel primer ball and it is deflated. Motor runs fine when the water is flat. I have tried draining the fuel filter and the ball looks fine. Any suggestions? Thanks, Bart

11-27-2008, 02:59 PM	#2
sosmarine Senior Member Sailfish Join Date: Sep 2007 Location: Navarre/Town Center Posts: 1,826	RE: Power surge when the boat pitches. Assuming your motor is carburated, could be float level, although this would not effect the primer bulb. Could be the pick up in the tank. If it is in the forward part of the tank, rare, and your fuel level is down, it could sucking air.

11-28-2008, 11:28 AM	#3
The Maintenance Shoppe Senior Member Snapper Join Date: Nov 2007 Posts: 530	RE: Power surge when the boat pitches. It sound like your antisiphon valve is causing you problems, Or it could be a kinked fuel line or a very dirty fuel/water seperator with alot of water in it. __________________ *The Maintenance Shoppe* Full service boat, pwc, and trailer repair 4048 Creighton Rd Pensacola, FL. 850-221-6789 www.themaintenanceshoppe.com

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