I recently purchased a D4D 84J421 and when not running with the fuel tank valve open the fuel siphons out of the fuel pump and onto the ground.  I have not checked to see if it
overflows when running.  I'm looking for suggestions on how to fix it.

Thanks.

I was an ACMOC member for a few years right after the group was started, when I owned a '36 RD4.
I sold the tractor and life went on, now I'm back in the Cat business.

Thank you.

If your seeing fuel coming from the tell tale drain line from the auxiliary drive housing you have a bad seal in the transfer pump. Replace both seals.

Will do.

Thanks.