Nissan: 92 stanza fuel pump replaced, now intermittent start prob

Last Friday, 1/16, had the fuel pump replaced in mom's 92 Stanza XE
2.4l KA24E.
Since then, every so often the car will keep cranking and cranking
before starting. My thought is that the shop miserably connected the
lines to the pump either inside or outside of the tank and it's
letting the pressure drop, requiring it to build again before it
starts. Or the check valve is messed up and the fuel is running back
into the tank. It happens randomly and there's no gas smell. The car
started fine before the fuel pump issue. When the pump went it was
about zero degrees outside and my initial thought was frozen fuel
lines because there was no fuel at the filter and she let the tank go
til almost empty. I added 5gal gas and a bottle of water
remover/anti-freeze and throughout the day would crank on it hoping it
would thaw out. Could I have killed (or maimed) the relay, or did the
shop that put the pump in screwed up?

TIA,
Mike

She had the work done at a local shop (non-Nissan), so I don't know
where they got it. The price for the pump was listed as $125 on the
invoice. I know that's cheap compared to other prices I've seen. It's
more than likely that it came from Parts Plus or Autozone. One of
those places had one for $86 for the pump only and $125 may be the
shop's markup. It did cross my mind that the replacement is too weak
and doesn't put out enough pressure. But when you're driving it it
doesn't hesitate and when you hit the gas it's right there.

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