Priming washdown pump

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AMCarter3
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Priming washdown pump

Postby AMCarter3 » Tue Mar 13, 2018 2:46 pm

Any suggestion for priming the washdown pump? After cleaning the filter on it last Fall, it has not been used. Now it doesn’t prime. The thru-hull is open and the pump runs.., I spurts of air out the deck fitting, but no water. I also tried filling the filter cup.
Mac Carter
2006 34' PDQ PowerCat "All Heart"; MV 98
Bellingham WA

deising
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Re: Priming washdown pump

Postby deising » Tue Mar 13, 2018 3:09 pm

I don't know the internal design of the pump, so maybe this won't work. You could try inserting the hose, removing the spray nozzle and pouring water back down with a funnel. If the water dribbles into the pumping mechanism, that might make a prime.
Duane Ising
m/v Diva Di
Punta Gorda, FL
2006 PDQ MV 34 - hull 91, 75HP, 3-blade

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AMCarter3
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Re: Priming washdown pump

Postby AMCarter3 » Tue Mar 13, 2018 3:35 pm

Duane, if you mean our water down the deck fitting, I tried that 3 times. It only accepts a little water and it did not prime the pump.

My next thought was to remove the hose clamps on thd intake hose sync put water down it.
Mac Carter
2006 34' PDQ PowerCat "All Heart"; MV 98
Bellingham WA

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Re: Priming washdown pump

Postby deising » Tue Mar 13, 2018 3:45 pm

I can't quite picture the arrangement right now, but moving the pump as low as possible would certainly help. That might not be very easy. Good luck.
Duane Ising
m/v Diva Di
Punta Gorda, FL
2006 PDQ MV 34 - hull 91, 75HP, 3-blade

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Re: Priming washdown pump

Postby duetto » Tue Mar 13, 2018 8:48 pm

when you release the nozzle does the pump continue to run? if so, it could be an air leak downstream from the pump. the strainer seal ring would be a likely place but we had a pinhole develop in the hose to the strainer which had the same symptoms. if you have the same jabsco pump as we do it we easily self prime. another possibility is a faulty or clogged check valve in the pump head. if it's a clog you can disassemble the head and clean it. if the valve cups have taken a set you may have to replace.
john & diane cummings
duetto mv34 #23

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Re: Priming washdown pump

Postby AMCarter3 » Wed Mar 14, 2018 10:12 am

I solved it. The strainer cup was not completely tight. My maint. tech guy suggested that and, after tightening it, it instantly primed and we had water flow.

Thanks for the ideas! It all helps.
Mac Carter
2006 34' PDQ PowerCat "All Heart"; MV 98
Bellingham WA


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