Benjamin Marauder Troubleshoot. No Pressure, can't fill

[boataphile]

So I went to shoot my Maruder (to rid myself of the red squirrels eating Internet fiberoptic cable) and I found no pressure in the gun. Attempt to pump up the gun fails as it seems the fill valve is not letting any pressure get to the gun. The gauge on my hand pump goes up rapidly but no pressure reaches the gun. Ideas?

Thank you

 

[WorriedMan]

Sounds like gunked up one-way fill valve. Drop, or two, of heavyweight silicone oil, in male foster fitting or inserted fill probe end, let soak, try to fill again. No luck, might need to dis-assemble valve, making sure zero pressure first. WM

 

[boataphile]

Thank you. That might explain why I can't fill it up but does it explain why it went from 2900psi yesterday to zero this morning?

 

[3Crows]

Sounds like you need to find the cause of the leak. It could be the stubborn fill valve is also leaking or an entirely different issue. Rifle might need cleaning and a reseal. The fill valve is nothing special, take it apart, clean, reseal or purchase a new one.

 

[WorriedMan]

Thank you. That might explain why I can't fill it up but does it explain why it went from 2900psi yesterday to zero this morning?

No, but need pressure to find leak. Suspect problems are related, possible moisture in system, handpumps can do that, if not careful to avoid heat buildup. Share outcome, if willing. WM

 

[Stubbers]

Cock the rifle with safety engaged, tape/rubberband a bag over the barrel while pumping and see if that is where the air is escaping while you attempt to pump, if not, repeat but with one fashioned around where the manometer/pressure gauge is. Those are the two most likely areas of pressure loss.

Ultimately it's near impossible to chase an air leak over the internet, the marauder is very simple and only a few places air can escape.

Fill valve (balloon/zip lock taped could locate)
Poppet valve (balloon/zip lock taped could locate from barrel)
Gauge or Gauge block orings (tough but a bag taped up could locate, if not soapy suds)
Valve oring (Would likely have air escaping from the trigger screw hole, easy to determine with soapy suds)

A tear down and close inspection of o-rings would be the BEST route if its been years since its been done, the o-rings are cheap, I got a bag of 50 from grainger for 3 or 4 bucks that will last me a life time.


-Matt

 

[boataphile]

Ok Thank you. It is the check valve. Have one on order as well as a bunch of o rings