Jabsco Pressure Pump for camper
Submitted: Friday, Nov 21, 2008 at 16:52
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Member - Nick (TAS)
Gday guys, hope someone can help.I got a 2.9GPM Jabsco pressure pump a fortnight ago to plumb into our camper for sink and shower duties.Plumbed it all up but pump dosnt shut down.It pumps good pressure but when you turn a tap off, it cycles on/off/ on/off(fast).There are NO leaks anywhere.First time it happened the supplier told me to take it back and get another.
Well just hooked the new one in and it still does it.
The pump draws from a 20lt drum into the pump and then to two taps.Its ment to self prime to 1.8mts.
Ideas.....pls(oh yeah, ive tried adjusting the little grub screw on top of the pump to no joy)
Reply By: Dunaruna - Friday, Nov 21, 2008 at 17:09
Friday, Nov 21, 2008 at 17:09
Have you checked for leaks, even an intermittent drip will cause the pressure valve to cycle.
I usually change the 'O' rings in the new pumps for thicker ones.
AnswerID:
336349
Reply By: Member - Redbakk (WA) - Friday, Nov 21, 2008 at 17:47
Friday, Nov 21, 2008 at 17:47
Cut in and cut out pressure too close together.....widen them apart by adjusting the differential?
Say by for example 80 kpa.
.
AnswerID:
336355
Follow Up By: Member - Redbakk (WA) - Friday, Nov 21, 2008 at 22:38
Friday, Nov 21, 2008 at 22:38
Can you put a pressure gauge on it to see what it is doing...ie how much the pressure is dropping.
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Reply By: Ray - Friday, Nov 21, 2008 at 17:56
Friday, Nov 21, 2008 at 17:56
Do you have an airlock in the piping?
AnswerID:
336356
Reply By: Notso - Friday, Nov 21, 2008 at 18:14
Friday, Nov 21, 2008 at 18:14
Maybe the non return valve is leaking back
AnswerID:
336359
Follow Up By: kev.h - Friday, Nov 21, 2008 at 19:17
Friday, Nov 21, 2008 at 19:17
Does it even have a non-return valve ? that could be the problem Another solution is to fit a small air
tank to the pressure side, if you don't have much pipework you wont have enough volume for it to hold pressure - even one of the small ones they use to stop
water hammer in your household plumbing will work - the problem with small volume pipework is that one or two drips will be enough even the leakback through the pump or streatch in the hose under pressure to cause cycling
Kev
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Follow Up By: Notso - Friday, Nov 21, 2008 at 20:06
Friday, Nov 21, 2008 at 20:06
It'd have to have some sort of stop valve to prevent drain back through the pump.
I have a Shurflo in the van with no reservoir and it works OK. It does have a hot
water service attached though so that would probably have a bit of air in the head space.
FollowupID:
604045
Follow Up By: oldtrack123 - Friday, Nov 21, 2008 at 21:50
Friday, Nov 21, 2008 at 21:50
Hi
Notso posted:
"It'd have to have some sort of stop valve to prevent drain back through the pump"
Very true but does it have one fitted integraly or do you need to fit one yourselve in the suction line.
Did it come with a manual?
I have no actual knowledge of that Flojet model & there does not seem to be much worthwhile info on the net,except to say it has a bypass system to minimise cycling when on demand @ low flow rates.
But the symptoms you describe seem to indicate a pressure loss with tap turned off.
AsK the supplier if it needs an external back flow check valve, [they may know]
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604056