Keeping find air in fuel filter in M9540

Hello,

My M9540 had clocked up enough hours to warrant changing the fuel filters. So I decided to change the filters and drop the diesel tank fuel at the same time.

I replaced the filters, emptied the tank, and bled the fuel lines. I thought everything was fine, but i was wrong.

I left the tractor overnight and then couldn't get in started the other morning. So, I checked everything and found that the new fuel filter was half full. I filled it back up again, re-bled the fuel lines, and got the tractor running again. The tractor ran fine too, no drop in power when it was working. I even took the tractor for ride up some hills with the throttle wide open and still had no loss of power or stuttering.

Anyway, I come to start it again this morning and the same bloody problem. Fuel missing from filter. It was around 50% full again.

I've just tried another fuel filter on it and the same problem.

I've also inspected the lines best I can and cannot find a leak anywhere.

Any ideas on how i go about diagnosing the cause of this problem?

Thanks in advance.

Most of the clamps are the thin wire type.

I'll check them in the morning and see if they move.

I think I might order some fresh fuel pipe and start replacing them. The tractors is a 2009 model and I don't think they've ever been replaced.

I got a funny feeling that this is going to be like trying to find a needle in a haystack.

Thanks for the help

Solved it. Turns out it was just a pipe with a slight tear. Didn't find the damage till i took that particular pipe off.

I thought it was going to be something more complex due to the air seeping into the system and no fuel leak. I assumed that if anything was punctured in the fuel line it would just leak. Yet there was no trace of fuel anywhere.

You learn something new every day.

Anyway thanks for the help guys. It's always appreciated.