VRO: Minimum Compression to Run the Air Pump
Posted: Thu Jul 14, 2016 11:21 am
I have been wrestling with my 2002 Johnson 175 for a few weeks now. I just completed a [cylinder pressure measurement] test and the results are 104-105-105-104-102-95-PSI for cylinders 1 to 6.
[The 2002 Johnson 175] runs good at idle and mid-range but starves for fuel at higher RPM's and WOT. If I pump the primer bulb all symptoms clear up until it uses all the primer pumped fuel again. Then the engine begins to misfire again due to lack of fuel.
I have rebuilt the VRO with the two diaphragm kits, I have checked and or replaced all of the fuel lines and primer bulb, I have checked and changed the fuel filter.
I know from doing the research that cylinder-6 is the cylinder that sends the pulse to the VRO for operation of the air pump. Is it possible that 95-PSI is not enough to run the VRO efficiently?
Should I replace the VRO with a new one?
Thanks for any input or assistance--hazzman
[The 2002 Johnson 175] runs good at idle and mid-range but starves for fuel at higher RPM's and WOT. If I pump the primer bulb all symptoms clear up until it uses all the primer pumped fuel again. Then the engine begins to misfire again due to lack of fuel.
I have rebuilt the VRO with the two diaphragm kits, I have checked and or replaced all of the fuel lines and primer bulb, I have checked and changed the fuel filter.
I know from doing the research that cylinder-6 is the cylinder that sends the pulse to the VRO for operation of the air pump. Is it possible that 95-PSI is not enough to run the VRO efficiently?
Should I replace the VRO with a new one?
Thanks for any input or assistance--hazzman