I have read through as much of the previous posts as I can and found nothing specific enough to my issue at hand. This summer we had a fuel filter blockage where I changed both the 10 micron Racor and the 4 micron secondary engine mounted filter. A few weeks later the Racor plugged again and I changed just that one. My post Racor filter vaccuum gauge was reading 11psi after the second stoppage and 8psi after the change. I don't have any reference to what numbers should be good to start with but at least now I know what does not work. The engine runs fine now but I am expecting more crud in the filters. I will add Biobor to the tank soon in hopes of an improvement.
The racor filters didn't look too bad but obviously were bad enough at least for a fuel system that is depending on gravity flow to get through. As I understand the system, and I may be wrong, once the engine starts the electric fuel pump stops and lets the fuel siphon down and probably gets sucked in by the injection pump hence the vacuum pressure. To facilitate bleeding after a filter change and to eliminate the blaring oil pressure beep from the panel with the ignition switch turned on, I previously wired in a hot wire that quick disconnects to the pump's positive wire to keep it running as long as necessary.
So finally the question is: would there be any harm in running the electric pump continuously if and when the fuel filters start to clog again? An accessible swith could be installed for emergency use. That extra pull through the Racor seems like what the halting engine needs to make it to a destination without the drama of dodging a regatta and maneuvering a few turns into a marina.
I wish to avoid the drama.
The racor filters didn't look too bad but obviously were bad enough at least for a fuel system that is depending on gravity flow to get through. As I understand the system, and I may be wrong, once the engine starts the electric fuel pump stops and lets the fuel siphon down and probably gets sucked in by the injection pump hence the vacuum pressure. To facilitate bleeding after a filter change and to eliminate the blaring oil pressure beep from the panel with the ignition switch turned on, I previously wired in a hot wire that quick disconnects to the pump's positive wire to keep it running as long as necessary.
So finally the question is: would there be any harm in running the electric pump continuously if and when the fuel filters start to clog again? An accessible swith could be installed for emergency use. That extra pull through the Racor seems like what the halting engine needs to make it to a destination without the drama of dodging a regatta and maneuvering a few turns into a marina.
I wish to avoid the drama.
