To my knowledge all fuel line o-rings are the same size.

This was posted by ncof300D:
Snap-on Hose seals
O-ring
13mm OD
8mm ID
2.5mm thick

Shut-off Valve seal
O-ring
17mm OD
12mm ID
2.5mm thick

Is the top of the IP where the delivery valves attach free of fuel? Those valves have o-rings too.

I've had difficulty getting the pre-filter o-ring to seal after repalcing it. You might check it again. What about the o-rings on the bolt that the main filter spins onto?

I suspect that as time goes by, your bubbles will begin to cause harder starts and eventually a leak will develop somewhere. You could try parking nose downhill to see if you could get fuel to leak so you could track it.

__________________
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)