I'd be willing to bet that the lower pump cap with the filter screen fell off the pump when you pulled it out of the bowl. There's no way the pump could have fit in the bowl unless the cap was installed and aligned correctly. Also, you said this was a "fix" but never said if it actually fixed the issue.
There is one sensor (the neutral throttle switch) that prevents the engine being over revved in neutral, but that limits rpm to 3000rpm approx. In other words, in neutral won't go faster than 3000 rpm. It is a self-protection. Under load should work at much more revs, unless the sensor is defective, or there are other mechanical or electrical problems.
Does the drain tube ever drain anything ever? Mine doesn’t have anything coming out, supposed to do that in the winter/storage to keep vst dry and clean
I have exactly the same problem, but my motor has only 29 hours. Mine constantly above 3000 RPM. Trying to avoid initial tear-down, I installed a pressure gauge in line between the high-pressure pump to see if the pressure fluctuated any during the surging. Logic tells me that if the suction does get blocked, the fuel flow will stop until the motor drops RPM to 3000 and the black plastic screen cap drops down to allow fuel to flow again. My assumption is that the pressure in the line should fluctuate too. I ran it several times and the fuel pressure stays at 52 pounds through the entire surging action. Any thoughts? Thanks Leon
How old was your outboard? Mine has around 50 hours on it and is doing similar. Haven't noticed what RPM i get up to but i'm only able to flow at around 9 gallons per hour.
Sweet! Nice video man, really informative! Thanks for making this :)
Excellent video
I'd be willing to bet that the lower pump cap with the filter screen fell off the pump when you pulled it out of the bowl. There's no way the pump could have fit in the bowl unless the cap was installed and aligned correctly. Also, you said this was a "fix" but never said if it actually fixed the issue.
There is one sensor (the neutral throttle switch) that prevents the engine being over revved in neutral, but that limits rpm to 3000rpm approx.
In other words, in neutral won't go faster than 3000 rpm. It is a self-protection. Under load should work at much more revs, unless the sensor is defective, or there are other mechanical or electrical problems.
Is this the same joe cappa who does the dope animations?
did you find that after you replaced that piece that your issue was fixed. My Suzuki 140 is doing the exact same thing as you described.
Does the drain tube ever drain anything ever? Mine doesn’t have anything coming out, supposed to do that in the winter/storage to keep vst dry and clean
I have exactly the same problem, but my motor has only 29 hours. Mine constantly above 3000 RPM. Trying to avoid initial tear-down, I installed a pressure gauge in line between the high-pressure pump to see if the pressure fluctuated any during the surging. Logic tells me that if the suction does get blocked, the fuel flow will stop until the motor drops RPM to 3000 and the black plastic screen cap drops down to allow fuel to flow again. My assumption is that the pressure in the line should fluctuate too. I ran it several times and the fuel pressure stays at 52 pounds through the entire surging action. Any thoughts?
Thanks Leon
How old was your outboard? Mine has around 50 hours on it and is doing similar. Haven't noticed what RPM i get up to but i'm only able to flow at around 9 gallons per hour.
Mu Suzuki 140hp the RPM no going up than 3000, I have 2 engine in my boat and both with the same issue. Can any one help on this?!
if you need help i will help you
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