My pre-filter always has Air in it, About 1/3air, i have changed both filters, Bled it to death,even when i am bleeding it the air remains,checked hoses and still their is air in it, cars seems to runs ok, any ideas?? where is it picking up the Air?
and why can't i expel it. Thanks

The air in pre-filter, quantity a function of orientation of pre-filter, is normal. This air is not pumped, but remains in filter. No problem. You can't expel it because the air sits at the top of the fuel (and stay's there).

Thats normal, their is supposed to be a bubble in the filter.

__________________
1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

Thanks
I can strike that from my to-do list

depending on how your filter is positioned 1/3 may be a lot or may be normal....like has been said its common to have some in there. The fact it runs fine under full load (no loss of power) says you have no reason for concern.

Mine is positioned such that I have little to no air in my prefilter.

__________________
Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
---------------------
Section 609 MVAC Certified
---------------------
"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche

If it's running okay forget about it and enjoy your ride.

Have a great day,