burner only low pressure

wow.. that's a test !

If it has a flow switch..
the magnetic slider could have come apart inside,
..where more flow pushes the magnet out of the slider-shell, away from the magnetic switch. ??
When you say low pressure, you mean reduced flow by reducing engine-spoeed ??
or by putting on a bigger nozzle (or opening variable-pressure wand) ??

these are reasons you need a reliable "troubleshooter" locally..
"Respect the tech" that can cover your back on a difficult day.
 
Does it gave flow switch, or pressure switch ??
send images of the pump and heater plumbing for more help.

wait a minute.. ..you have an "older" unit..
it might have a "vac-on switch" plumbed into the inlet-side of the pump..
If your pump seals or unloader seals are bleeding,
the limited flow will dis-allow the vac-on to do its thing !
Get a pressure gauge on that pump (permenantly,)
so we can continue troubleshpooting. Eh?
send pictures !!!!
and .. you HAVE to come to Tampa !
best education you can get IN A WEEKEND !

So you send those pictures yet ??
 
JERRY,
Pleasr excuse my ignorance for not knowing what parts i may or may not have on my unit, I am very new to this and only know what i have learned here or thru my own trial and error.

this proplem only started today but prior issues may have led up to this so I will give you a little background. three days ago I took my pluming apart to clean out all my lines because of a blockage. after cleaning out all the lines i then took out the 6 plugs and cleaned up the check valves, while i had them out i noticed some stuff keeping the valve open so i took the garage out after inspecting it closer i noticed the plastic that holds the spring was cracked. not haveing a new one i just put everything back together and the pump seems to works great.I have a general t991 pump.that originally was 1900 psi but was bumped up to 2400. the gauge i have says 2400 while i spray and there is no more blockage issues.
again sorry aout the not knowing names but there is one part on the discharge side of the pump that has a diaphram on it and a small finger lever pump, this same part has a small button on one end and a bolt on the other. i noticed the other day that the button would go in and out while the pump is on. today that button seems stuck and does not go in and out

does this help at all? i took pictures of everything so when i put it all together i would put it right but i can not get to the pictures right now i can upload them tommorow
 
picture

001 (640x480).jpg002 (640x480).jpg003 (640x480).jpg


here is apic of what i was talking about. the center picture has the bolt and button ( the button that no longer goes in amd out)what is that part called? the third picture shows the diaphram part. the diaphram is under the electrical box, that electrical box has contacts,if those contacts are not working properly would that affect the burner? confused yet?
Thanks for the help Steven
 
Sounds like your unloader is messed up. If the "button" (which is actually the end of the bypass piston) isn't moving, the unloader is staying in bypass, so the vac switch won't pull in. A quick fix for you to try is this: remove the cover that the "button" pokes through. Pull the piston out of the cover, and get the spring that is underneath it. Stretch the spring EVENLY about 1/4" and put it back together. While you're using it like this, go ahead and order a new one. That bandaid repair won't last forever.
 
I would get rid of the galvanized and regular pipe fittings, just a short time before they rust through and start leaking or have a serious blow out which could be dangerous.

Get high pressure or hydraulic fittings to replace the regular pipe and galvanized fittings.

The rust that flakes off will clog nozzles and start headaches dealing with that mess.
 
thanks for the tip, everything is working correctly, for now, streched the spring 1/4 inch and all is well. as to changing over to stainless and ordering a new unloader I will need to make some cash first. but i did get a job for wednesday yahooooo!!!!!!!!


again thanks for the help EVERYONE
 
STAY with the K-7.. the BEST unloader in the world,
rebuildable to a degree, (call for details)

Don't give that pump another 100psi.. it can handle where you are, but don't go over.
also.. I totally agree with Tom & Chris.. yer fittings suck.. air, when the rust thru.
use brass on inlet fittings, and plated steel or stainless on HP side

and that is a Vac-On switch, under the K7.
I guess good. Eh?
 
Thanks Jerry, the unit is pretty old, but it does start and run good. right now i will be concentrating on keeping it that way. I have a job for wednesday and will be pounding the pavement today. I understand the importance of having the right lines and i will be replacing them a.s.a.p.
I would assume from your signiture that you have parts for sale, is that correct?
Thanks Steven
 
several of us (suppliers) "active on the boards" sell these parts,
I stock more of these specialty parts typically,
..my favorite topic is reclaim equipment. :)

are you coming to the Tampa event in July ??
 
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