I am debating with a guy in another forum about the role the o-rings and caps play in letting air into the system and causing hard starting.
We all know the o-rings cause it when they leak air. He claims the return system has nothing to do with the fuel filter or the input to the injection pump. Like I said we all know it does, I have experienced it myself. But can anyone explain how the fuel is drained from the fuel filter and the input to the IP if the fuel leaves the injector return circuit?
I see the fuel filter head has a line running directly from it to the return caps on the pass side. But he argues that there should be a check in the filter head at that line connection, and I have also read that some of you guys just delete this line, eliminating that pathway.
I also see a return line leading from the IP. I thought aha!, this is the connection between the return system and the fuel input and fuel filter. But he argues that the return line connection from the IP comes from a upper portion of the IP and there is no way that fuel leaving that line from the IP can suck all the fuel out of the input to the IP and the fuel filter.
I told him recently I had the o-ring leaking on the heater in the filter head and he admitted this would be a problem and let the fuel drain from the filter.
I find myself having experienced this problem, and know all about how to fix it, but not knowing the details of how it exactly happens.
We all know the o-rings cause it when they leak air. He claims the return system has nothing to do with the fuel filter or the input to the injection pump. Like I said we all know it does, I have experienced it myself. But can anyone explain how the fuel is drained from the fuel filter and the input to the IP if the fuel leaves the injector return circuit?
I see the fuel filter head has a line running directly from it to the return caps on the pass side. But he argues that there should be a check in the filter head at that line connection, and I have also read that some of you guys just delete this line, eliminating that pathway.
I also see a return line leading from the IP. I thought aha!, this is the connection between the return system and the fuel input and fuel filter. But he argues that the return line connection from the IP comes from a upper portion of the IP and there is no way that fuel leaving that line from the IP can suck all the fuel out of the input to the IP and the fuel filter.
I told him recently I had the o-ring leaking on the heater in the filter head and he admitted this would be a problem and let the fuel drain from the filter.
I find myself having experienced this problem, and know all about how to fix it, but not knowing the details of how it exactly happens.