D'oh!!!
Got a Eheim 1260 on a 60 gallon. Noticed that there was very little water coming up from the sump. Pulled the pump, rinsed off the outside grill, backflushed some water through the pump discharge. Reinstalled, but still no flow. Ran a bendable brush through the supply line and checked the shut off valve for any obstructions. Now I'm about 45 mins into working on this problem and still no resolution.
Pulled the cover off the pump to discover there was a sponge filter that I never knew was on there. It was completely plugged with goop and other crud. I've had this pump for almost two years and never knew it had a sponge filter inside the cover.
The problem could have been resolved in 5 mins if I'd read the pump manual. What is your d'oh moment in this hobby?
I refuse to join any club that would have me as a member.
Groucho Marx