I called Walbro and left a message. They called back and are going to send out parts to fix the issue. I told them what I did and that I did not expect warranty to apply with the bad tanks/fuel/etc. They indicated they were working on kits, but, are taking care of me no charge. At least I get a break on 6.5 parts for a change. Maybe I am the only one to FUBAR a Walbro pump and as new is the FRB-15 is...
Sigh... this gives me serious concerns about the IP's condition.
In this case a pre LP filter would have just plugged and be another expense. Too much dirt and slime going through the system. After all I plugged every screen and sock in the system pre-post filters did not matter. The pumps do have a screen in them that does the job. This screen plugged and I removed it. The tank sock has a bypass in it and will let dirt in that I didn't know about. Best to run without a hard to service sock and just use a pre LP filter.
I am looking at a pre LP CAT type of filter. Perhaps it will cut down on LP failures...
Even without a screen in place the lift pump screen bowl had a sludge/rust buildup half way up the bowl. Looked like someone had spit used chewing tobacco in the bowl. The FFM was simply disgusting.