Duel tank issues 95 f150 4.9

My truck just started acting up went to start it
would crank over but no start until I turn the key off
and on several times without turning it over , you
can hear the pumps come on but until I turn key on
several times and listen the pumps come on then a
louder click comes right after the pumps then it will
start and it won't switch tanks unless i switch the
switch from front to back then it switches . I switch
the relays around , I checked the inertia switch it's
good or not blocking , I took the rear fuel pump out
tested it it's good they both come on when you turn
key on , I checked the distribution box for broken
wires I did pressure test same thing wont go to
pressure until I turn key on and off then the click
comes then it pressurized I changed the fuel filter
and now I'm stumped please help