Question about Pentair 2.0 Hp Whisperflo Pump

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My pump is making noise like its going to start but it doesnt. If I leave it on for awhile it finally starts. What could cause this?

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It is either the starter capacitor or the motor brushes. check the starter capacitor first.

Posted on Aug 23, 2009

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Hard to start in mornings


A common cause is a faulty check valve in the pump. The check valve prevents fuel pressure from draining back into the tank. The pump gets power from the relay for only 3 seconds during crank which would not be enough if the fuel line has zero pressure. You could cycle the key on and off a few times and probably start it quicker if that is the problem.
Have the fuel pressure checked after sitting overnight.

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It's possible that the fuel pump is starting to go out. More often than not if a fuel pump goes bad, it just leaves you stranded. Sometimes as the pump wears it will develop a catch in it and lock up temporarily.

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My car seems to all of a sudden shake when I accelerate and then the muffler makes a weird noise and it dies. I try to restart but will not restar...then I leave it for like 15min and then it will start....


Coil or ignition module may be getting hot and failing but the Most common cause of an engine that stalls and will not start back, but starts after it sits awhile:

Clogged catalytic converter. It lets your exhaust gasses build up backpressure and it can no longer breath. The pressure releases over time, allowing your engine to start again, only to build up the backpressure again.

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THE NOISE YOU ARE HEARING IS THE ELECTRIC HIGH PRESSURE FUEL PUMP IN THE GAS TANK, THE NOISE IS CAUSED BY THE PUMPS ROTOR BEARINGS BEING EXCESSILY WORN, IT COULD STOP WORKING TODAY OR KEEP GOING FOR YEARS, BUT THE NOISE IS A WARNING THAT THE PUMP HAS A PROBLEM. I RECOMEND IF IT IS REALLY THAT NOISEY YOU HAVE IT REPLACED.

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That is the fuel pump doing its job of pumping. If it stops making noise, it stopped pumping, and no gas is getting into your motor. Your bike will not run without a running fuel pump. :)

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1 Answer

Starts fine most of the time but once in awhile it will crank but not start, never shuts off while driving it. I drove it 30 miles one day made 2 stops and it started fine then I stoped for gas and it...


Could be your fuel pump starting to go. When it doesnt start, open your gas cap and listen for a whining noise when the key is turned onto the on position. This will indicate the fuel pump is working. If you dont hear that noise, then it most probably is the fuel pump.

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1 Answer

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