Sprinkler pump won't prime

Discussion in 'Irrigation / Sprinkler Forum' started by lsc87, Aug 4, 2007.

  1. lsc87

    lsc87 New Member

    Messages:
    11
    I have a new 1.5 hp sprinkler pump to draw surface water. The pump is next to the lake, with 12 feet of 2" hose between the pump and water, with a checkvalve at the end of the pipe. The vertical distance is 3 feet. Then I have 70 feet of 1 1/4 inch pvc going to the sprinklers.

    I had it working once, and it easily primed by turning on the city water (which is still cut into the sprinklers via a valve with backflow) and letting the city water fill the discharge pipe and pump. The water will also flow into the intake pipe in this way.

    I dont' have a T pipe at the pump. I know this would work too, but filling the outflow pipe IS filling the pump. I looked at the checkvalve and it's facing the correct way. Even without it wouldn't draw.

    What am I doing wrong?

    thanks
    Doug
  2. Bob NH

    Bob NH In the Trades

    Messages:
    3,317
    Location:
    New Hampshire
    The line from the lake to the pump should be always rising. If there is a high spot (a hump) in the suction line it will collect air and will not pump efficiently if at all.

    If there is a leak in the suction line it will lose prime.

    You usually want a valve to let the air out of the discharge side of the pump when it is getting started.

    If the pump is not staying full of water when the pump is off, then the suction side pipe or the check valve is leaking.

    If the discharge pipe has an outlet that is lower than the top of the pump then the water can dribble out and cause loss of prime.
Similar Threads: Sprinkler pump
Forum Title Date
Irrigation / Sprinkler Forum Sprinkler Pump lost/losing prime? (Florida) Mar 23, 2013
Irrigation / Sprinkler Forum pump start relay bad? (hunter sprinklers) Oct 4, 2011
Irrigation / Sprinkler Forum Lawn Sprinkler Pump Short Cycle Jul 20, 2010
Irrigation / Sprinkler Forum Replacing a Goulds J10S 1 hp pump for home sprinkler system Jul 6, 2010
Irrigation / Sprinkler Forum How to turn on sprinkler pump? (novice=may be an easy answer!) Apr 14, 2010

Share This Page