Should I worry about fine "mist" of bubbles in return line?

[Monoaural]

Long story short, I have a 1.6 with a 1.5 pump on it, that was just resurrected from sitting 6+ years. The return line started leaking, as with several of the jumpers, so replaced them all with clear vinyl line. At idle, small amount of bubbles, if you rev it, and a fine mist of bubbles in the return line. Also, the jumpers just spit a little, didn't fill up with a drive around the block. A small bubble or two will come through the feed when idling as well. Only real drivablity issue I have is at 55mph in 4th(4 speed), it has a nasty vibration, the gas pedal feels like those feet massagers at the fair.
Also, I have the 1.5 pump timed at 1.00mm, is that too far advanced?

[8v-of-fury]

Does the vibration happen at that engine rpm in any other gear? If yes, then there may be an engine problem. If no, then it is likely a drive train problem. Such as axles, tires, or brakes. If it is only that speed, then it is likely the latter.

Small air bubbles are not supposed to be there, but generally don't cause any huge issues. As I'm sure you have seen, it probably drives fine.

On the timing, depending on the 1.5 pump it may even need a static timing as high as 1.15mm.

[fatmobile]

If you just opened it up and replaced lines you might have some small air bubbles running around for awhile.
 
 Vibration is probably caused by a loose injection pump bolt.
  Not just the main 4 but also check the bolts holding the brackets to the block.

[Monoaural]

If you just opened it up and replaced lines you might have some small air bubbles running around for awhile.
 
 Vibration is probably caused by a loose injection pump bolt.
  Not just the main 4 but also check the bolts holding the brackets to the block.

I think you nailed it on both counts. I have a stripped out bolt on the pump. And seems after the 60 mile commute today, no air. And I know it isn't accurate with such a low fill up, but got 47mpg@ 65mph. http://fuel.ly/141954

[hillfolk'r]

yep fatmobile hit it on the head..seen that more than once..get any and all stripped bolts fixed..itll vibrate...surge at speed too very annoying

[Monoaural]

And here I was gonna ask if it was gonna make it surge. Because it is.

[hillfolk'r]

The sucky cone bolt on the pump head end ?yea it sucks if you lose it.dont lose it!
you could halfbutt it witha nut and bolt,bit thats way not cool,only to get ya home if needed.
and the 2 bolts holding the bracket to the block?if those are stripped,ya may as well pull the pump so you can rethread or heli coil them.
dont forget your hi psi line clamps too.
leave them off for long and you will break a line.