Years ago, I put an electric fuel pump in line with my mechanical pump
to help in bleeding the fuel system. When I turned the key, it would
run till the system was pressurized and would then stop. If it ran a
lot, I knew I had to bleed the system. It finally had the diaphragm
go bad so I replaced it but was unable to get an exact replacement.
The new pump runs ALL the time unless I turn the key off and if I
allow it to run all the time it gets hot. Did I get two different
kinds of pump? Was the first a "demand pump" that turns off when the
output side is pressurized? Neither set of directions said anything
about this.