Fuel starvation??????

[M. Wolf]

I have a 2000 Johnson Ocean Pro V that runs great at idle. After a less than a minute on the throttle - the boat starts to sputter and will shut off. I noticed that the squeeze ball collapses when this happens. The fuel line runs from the tank to a fuel/water seperator, then to a "gizmo" that has two electrical wires hooked to it. The it goes through the squeeze ball and to the motor.

Where should I start troubleshooting. The fuel water seperator has 2 hours on it. Is the "gizmo" with the electrical wires the fuel pump?

I'm pretty new to this. Any help would be appreciated.

Thanks

 

[racerone]

If the squeeze ball ( manual fuel pump ) collapses then the fuel pump on the motor is working very well.------------Look for restrictions in fuel supply to the motor.------------------Anti syphon valve on tank outlet ----Plugged filters -------Too small a fuel line ------------Fuel line that has been damaged by " modern fuels "--------------The gizmo with the wires may be an " electric primer " , If you have that there then why the primer ball ( manual fuel pump )-------------Any pictures of this gadget.----Is there a switch near the helm that is marked ---" fuel pump " or " electric primer "

 

[joereeves]

(Fuel Anti Siphon Valve)
(J. Reeves)

Many of the later OMC V/6 engines incorporate a fuel restriction warning via a vacuum device attached to the powerhead. If the engine overheats, or if you have a fuel restriction, the warning is the same.... a steady constant beep.

NOTE... Only the V/6 & V/8 engines have the above "Fuel Restriction Warning". The warning horn will not sound on the other models.

The fact that a engine is not overheating, but the warning horn sounds off with a constant steady beep, and that the rpms drop drastically would indicate that the engine is starving for fuel due to a fuel restriction. Check the built in fuel tank where the rubber fuel line attaches to the tank fitting. That fitting is in all probability a "Anti Siphon" valve which is notorious for sticking in a semi closed position. It will be aluminum, about 2" long, and the insides of it will consist of a spring, a ball, and a ball seat. If this valve exists, remove it, knock out those inner components which will convert it to a straight through fitting, then re-install it. Hopefully that cures the problem.

The above procedure will cure a restriction problem with the anti siphon valve as stated. BUT, it may also allow fuel to drain backwards to the fuel tank when the engine is not running (siphoning backwards) due to the fact that the carburetors/fuel pump etc are higher than the fuel tank. This condition is not an absolute as the valves in the fuel primer bulb usually prevent this backwards siphoning problem. However.... if this does take place, the cure would be to install a new anti siphon valve.

Thousands of parts in my remaining stock. Not able to list them all. Let me know what you need and I'll look it up for you. Visit my eBay auction at:

http://shop.ebay.com/Joe_OMC32/m.html?_dmd=1&_ipg=50&_sop=12&_rdc=1

 

[M. Wolf]

Thank you both for the info. The motor is on a 1988 Grady White Tournament 19. When I removed the brass fitting from the top of the fuel tank, (where the fuel line connects to the fuel/water seperator, the fuel pick-up tube came out with it. There was a small screen lodged up inside of the tube near the fitting that was apparently obstructing the flow. I pulled the screen out of the tube, reassembled everything and took it for a test run. Problem solved. I did not see a anti-siphon check in the fitting itself.

Thanks again for pointing me in the right direction.

Mike