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

[cn90]

Thanks andrewwynn,

The photo you posted above should NOT be used to show your point.
That photo I took is when I pried the Coupler out.
It was halfway out so it is NOT an in-situ photo of factory setup!

I am very convinced the root cause is either:
A. O-ring shrinking with time.
B. The one-way valve (Plastic+Spring) momentarily seized,
pressure builds up and blows the O-ring outward...

Just some theories...


BTW, I think one can remove the Plastic+Spring combo (I did not) w/o any issues. This is an over-engineered part.