How to Fix a Leaking Benjamin Marauder .25 Cal

This is how I finally fixed my leaking Benjamin Marauder .25 caliber air rifle. It would leak down to less than 1000 psi and was getting worse.
After determining it was leaking from the gauge area, I replaced gauge stem orings and even tried some Teflon tape to no avail.
After disassembling the gun, I found the orings were corroded from water intrusion around the gauge port assembly.
I attribute this to my hand pumping without using a drier. I have hand pumped this gun only a handful of times, having mostly filled from a scuba tank filled at a reputable dive shop.
I would recommend this as a general maintenance item if you hand pump ...especially if you are pumping in a humid environment.
Below are the Amazon links to some of the products used. Please use these links. If you make a purchase, I will make a small commission to help the channel grow. Mahalos!
Benjamin Marauder .25 cal. Setup:
Benjamin Marauder .25 caliber rifle: amzn.to/2F3QC8l
Utg 30Mm Swat 3-12X44 Fs Ie Ao Mil Dot Rifle Scope: amzn.to/2D07w7h
UTG Add-on Index Wheel for Side Wheel AO Scope, 80mm: amzn.to/2D1xwiw

[@johnod2417]

Good info, thanks for taking the time to put the video up. Please consider that the background music adds nothing to the content and if anything makes it harder to follow along for older guys like me. Thank you.

[@spiderman0863]

Actually the background music is atrociously annoying. Good video otherwise.

[@jeffmwoods]

music was a bit much til i started listening to it....great stuff. oh and your instructional video was excellent too. thanks

[@ronalbert3325]

Thanks for taking the time and effort to film this repair. I just can't for the life of me understand why you would go through the trouble of taking this all apart and even doing some deburring and not even touch the valve assembly/poppet?? That is THE main cause of leaks in many PCP air rifles. Again thanks for the video.

[@Romans--bo7br]

Why do some people think that they need to have "background music" (noise) in their otherwise, good video's?? Very distracting... from what could be very good information.

[@chuckward9793]

Really nice job. I can appreciate when a job is done with extreme thought and attention to detail. I am getting ready to do the same to mine and will do it just like you did. I also am pretty handy with whatever I want to do but like you I have never had mine that far disassembled. KZbin is great for things like this and your video is top notch.

[@OutdoorsMaui]

Chuck, Thank you very much for the kind words! Sounds silly, but it actually makes it worthwhile to do these vids when you get positive feedback. Thanks again and good luck with your tear- down.

[@BullseyeBob]

Excellent video!!! I have a Maximus that loses half the air in just 6 hours so I have an o ring kit on the way.

[@bokey1968]

Did you know there’s some goofy bebop musical track playing over your audio

[@Hogarth714]

Excellent video. Thanks for taking the time and effort to share this. I have the same problem. Do you happen to know the size of the o-rings you replaced?

[@roberttheriot7612]

Did you make that stock on your own? i love it. gun has to be much lighter. that's what i need with my bad shoulder maybe you can help me out i'd appreciate it. great video

[@iikkakonola]

I found out it's really hard to hear what you are saying because of the music. Good video but music was really not needed.

[@kxp.1496]

That and he’s not talking in the mic. The music was a dumb idea too

[@jankyfpv4081]

Why music so loud you cant hear what you are saying?

[@joearrieta]

Music gets in the way of your instructions, totally unnecessary.

[@WICH-ql1be]

What size is the O-ring?

[@FredCarney]

No music whlle you are talking please

[@chandrasanjaya756]

how to seal the hard one sir ??

[@scientist100]

I had my gun stored for some time with pressure; before it would eventually lose the air if it was sitting for a long time. This time, the kept noticing that the pressure was not being lost for several days and it was odd, I decided to shoot once and when I did, it started leaking after the shot, is there an seal that opens momentarily and is supposed to close after the timed shot? Mine appears to be stuck in the open position because the air started leaking a lot at the bore and it emptied the air. Any idea what could it be? Thanks in advance.

[@OutdoorsMaui]

Hi, Sounds as though your valve poppet is leaking. There can be several reasons, the first may be some debris is caught underneath the poppet and valve face. Sometimes you can shoot it several times in a row unloaded and it will dislodge the debris. But if you are actually hearing a leak from the barrel the poppet may be damaged. Also try backing off your hammer spring and striker it is possible but not probable it is pressing on the valve stem and causing the leak. Those are the easy things to try first.

[@scientist100]

@@OutdoorsMaui There was major leak and even when retracting the hammer, it would not do anything, I dry shot a couple of times before it completely emptied the air. I will have to disassemble and see if there is anything obvious. I put my finger at the tip of the bore because the hissing sound was a lot and there was a lot of pressure from it. I'm guessing it may need lubed but who knows, the an o-ring may be damaged. Where can I find kits to repair the .22 Marauder and what oil should I use to lube the o-ring and the components? Thanks in advance.

[@chaoticadventure]

@@scientist100 Amazon has kits and O ring assortments. Only use 100% silicone oils and grease never use petroleum based oils. "Super lube" can be had on Amazon for $5. Worls great

[@MrPeterschmit]

Its really hard to hear you over the music. Just fyi. Cool video though

[@junmangubat]

Music is a distraction.

[@Dutch1722]

Would ya make a prod video?

[@chaoticadventure]

Same thing just smaller

[@kxp.1496]

You should really take pride in your video and redo the talking so it’s not so hard to hear and while you’re at it lose the music, wasn’t too bright of an idea

[@NorthFloridaAirGunner]

The way i fix a leaking benjamin marauder, or and leaky pcp for that matter, is not buy one in the first place.😉