[jouk45]

Jo,

Funny that

When I use my BP I often hear a slight hissing sound, especialy after I have run it for a while. I am certain it is the lid valve sucking . I have never had any problems with the preasure (only when I had a blocked jet).

David

david, i have heard it to,   next time it happens look at the water pressure from the nozzles, then press the black air valve.
it picks up instantly,

[Jeff Brimble]

Matabi was sold by Cleantech with an uprated Flojet pump, Matabi found out and withdrew it off the UK market ( think its still available) . Rectangular witha nice big handle on the top.
Drill a tiny hole in the top of the container or lid, or put a hot needle through to make an air vent to stop the vacumm build up.

[Jeff Brimble]

Matabi 12v sprayer link-  Spanish Goizper http://www.matabi.com/eng/agricola/frame00.htm
Click Matabi then electric sprayers for pic.

[jouk45]

so did everyone know about this black realease button, or am i a plonker,  i can take it like a man  :

[jeff1]

I must admit Joe, I give mine a press a couple of times a week, I do this just to ensure the spring is not stuck, but I have never pressed it during operation, so I will keep an eye on this in the future.

[Captain Scarlet]

heres a 20 ltr backpack,

http://www.gardening-tools-direct.co.uk/Merchant2/4.13/merchant.mv?Screen=PROD&Store_Code=1&Product_Code=coopercp3&Category_Code=SPRAY

[Jeff Brimble]

The cooper pac looks like a hand operated piston pump  in the 3rd pic, not a 12v system.

[D.Salkeld_Ltd]

david, i have heard it to,   next time it happens look at the water pressure from the nozzles, then press the black air valve.
it picks up instantly,

Jo, I'll give it a try next time it hisses at me

David

[jouk45]

where you a crash test  dummy  so am a plonker he he

[Peter Fogwill]

Jouk, I don't know much about the backpack but it seems like yours could have a faulty valve? Maybe not letting enough air in?

Peter

[jouk45]

Jouk, I don't know much about the backpack but it seems like yours could have a faulty valve? Maybe not letting enough air in?

Peter

peter i have looked at the spring, quite a simple valve really, seems ok, instead of an external valve that pushes up and lets air out under pressure, this one is internal under the lid?? maybe its supposed to be pulled down, under pressure, the oposite if you know what i mean,  to let air in, funny thing is it says nothing about it in the instructions,

[Peter Fogwill]

If it dosn't say anything in the instructions it seems like you probably shouldn't have to press it to draw in the air.  Seems like you have a faulty one.

What could be happening is on high setting the water is going out faster than the air is coming in, the valve is not letting the air in fast enough??

Peter

[jouk45]

yes see what you mean peter, if it comes down to it, i may remove it, and see how it it works from there, thanks peter,

[jeff1]

The spring is a very weak one and should operate with ease, I know mine does.

[dai]

I never bother pressing the button down either. I assumed that as it will leak if it tips over, the air can find it's way in. I knew what the button was for. Been using outboard motors for years, these can develope the same problems if a vacum builds up in the fuel tank. Dai

[jouk45]

I never bother pressing the button down either. I assumed that as it will leak if it tips over, the air can find it's way in. I knew what the button was for. Been using outboard motors for years, these can develope the same problems if a vacum builds up in the fuel tank. Dai

yes i understand, but what throws me of all the fault solutions is, if its meant to do it automaticly, why?? THE BIG BLACK BUTTON, staring at us, normaly it would just be a small hole, but this big black button almost says push me, as its finger size,
and it does push down? get what i am saying, i always learn theres logic in everything, thats what got me puzzled,