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I have a vp-540 that had 25% of the head firing so i changed the cap and i got it to fire about 60% then I did about 4 medium cleanings and now it is back to 25% does any body have any suggestions?? :signs101:
Is the cartridge almost empty? Also, the hose at cap to pump can sometimes come loose over time, the rubber can swell just a bit. Snip off a 1/4 inch and reattach
If it's empty and you've tried to fill the lines then you may likely have a air leak in a o-ring on the damper or a cracked line or the cartridge is empty.
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