Fuel Pump Doesn't Prime Immediately

Since a friend replaced my fuel pump a while
back, I've had an issue with starting the car,
it's almost as if it's not holding the prime. After
the first few cranks I can hear the pump turn
on, and then click. Then it will usually fire
second turn of the key with the exception of it
being -35, then it may need me to prime again.
Never 4.
The fuel pump is accessible through the back
seat, so I'm hoping if it may be something
simple I'll try to fix it first before I bring it to a
shop. Im not sure where the check valve is
located, but could he have done something by
accident to that? Ive just quickly looked at it
before, and honestly the lid didn't look properly
sealed.

If someone could please tell me where I
should check first, and perhaps save me a bit
of time and headache it would be very greatly
appreciated.

Plus I can't imagine the starter is in much
agreement with the current setup lol.