Help with water supply issue from fresh water tank

newman fulltimer wrote:
then it can only be two other things eaither your suction line is collapsing or your pump is weak and wont pull the distance needed

I am afraid you are right about the suction line collapsing...the pump pulls water from my 7 gallon water jug just fine...but I am puzzled as to why I can't blow back through the line easily either...

Wonder how big a job it is to replace the suction line????

Regards