"If a fuel pump is applied 12V
"If a fuel pump is applied 12V directly, what might cause it not to pump?
The only thing I can think of is that it must have a pressure sensor to tell it to stop pumping if the carb is full (i.e., the needle valve is shut because the float is at the top of the bowl).
I ask because I'm applying 12V directly to the pump via a pushbutton switch at the console, and sometimes it doesn't come on. There have been times that I pushed the button once, and it didn't work (at a cold start). I waited a few seconds, pushed it again, didn't work. Waited again a few seconds, pushed it, and it did work (filled up the carb with fresh gas)."
"If a fuel pump is applied 12V directly, what might cause it not to pump?
The only thing I can think of is that it must have a pressure sensor to tell it to stop pumping if the carb is full (i.e., the needle valve is shut because the float is at the top of the bowl).
I ask because I'm applying 12V directly to the pump via a pushbutton switch at the console, and sometimes it doesn't come on. There have been times that I pushed the button once, and it didn't work (at a cold start). I waited a few seconds, pushed it again, didn't work. Waited again a few seconds, pushed it, and it did work (filled up the carb with fresh gas)."