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hi all I have a 2004 150 Johnson starts cold ok and runs fine the problem is if I sit for an hour or so it restarts but stalls. I have checked all fittings and hoses no fuel leaks. I did the fuel pressure test and the gauge gos from 4 psi to 1 psi back and forth.the book says it sould stabilize at one reading.checked pulse limiter and its clean no carbon. could a leaking needle valve and seat in vapor separator be causing this? or may a bad diafram in the fapor pump.any ideas? thanks joe458
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(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.
NOTE: There has been cases when the output valve in the fuel primer bulb would come apart, and the inner portion of the valve would actually reverse itself and be drawn back into the primer bulb's output valve body. This in effect would create a shut off valve and result in a fuel restriction. If this is the case, you should be able to feel something laying in the bottom of the primer bulb when held horizontally. -
04 150 hardrestart
No alarms or lighs, just don't restart like it used to.I have a new Oms pump coming along with gaskets and needle and seat for vapor pump we'll see what happens.Comment
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Johnson 150 hardstart
Well new oms pump and vapor pump did nothing.tested coils and stator seem to Be fine.I'm out of ideas.I guess next step is the dealer.if any one has any suggestions I would love to hear from them. Thanks let you knowComment
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