I've tried 3 different fingerings and none feel right.
Ascending left hand;

F C Eb F Ab Bb ( all 8th notes)

I've tried:

5 2 1 2 1 2

5 2 1 3 2 1

5 3 2 1 3 2


My next measure is the chord Bb Eb F Ab

Any suggestions are appreciated - I just need to decide on something and stick to it. I have small hands!!

532132

I like 521321. If you're hand's really small you might try 513212? I don't like 532132, especially for a small hand.

Sometimes there may not be a fingering that feel comfortable and easy. Only you decide which you like best unless someone makes another suggestion. Sometimes it can be very difficult to decide and only time will allow a final decision.

How about 514321?

The stretch from 1-4 is rather large, but I'm assuming that the chord you play next is beneath the B-flat that you end this passage on, and thus the center of your hand will lie approximatley even over the chord.

it might help to say what the tempo is also, since that can make a difference in fingering

I just tried it and the most comfortable fingering for me (and my hands) is 532132 or possibly also 514321.

Depending on a few variables, another alternative that may work is 532121. You will have to move your hand in more to get the thumb up onto the Bb. If you can't get 5321 to work, you either have the smallest hands ever, or there is likely a technique issues. It's not a very large stretch by any standard. If you can reach a seventh comfortably, you should be able to play this as an 8th note passage without trouble.

If, however, you truly do have a severely small hand issue, you can try playing 55 as opposed to 51 for the first two notes. Might help get your hand in a better position, but I really don't like this option unless your hands are truly small.