In-line Fuel valve rather than new pump

[jedw7503]

I'm having pressure retention troubles overnight with an E30, resulting in excerssive cranking in the morning.
I understand that means the non-revurn value built inot the pump has had it, and usually requires a complete new pump to fix.
Rather than replace an otherwise lovely quiet pump, has anyone had any joy installing a non-return valve inline?
I've heard it does work and can saves a stack of money, but not sure what sort to go looking for.

Jeff -320i Cabriolet in Perth, Western Australia