DIY: E53 X5 Siphon Pump with Improved O-ring and Teflon Wrap

[cn90]

Another thought as to root cause...

The fuel pressure regulator is built into the fuel filter.
I wonder if or when the FPR fails, does it allow too much fuel
pressure in the return line to rise let's say from 20-25 psi
(does anyone know the normal fuel pressure in a return line?)
to the 45-55 psi range (which is normal operating range),
causing seal blowout?

For every problem, there must be a cause...