P-Mod suddenly not holding pressure?

[steve-kville]

I have a P-Mod I set up for recreational shooting and teaching younger children. I've had it for almost a year. I first had a simple 11mm/pic rail mounted with a red dot on top. This past winter I decided to mount a scope with 11mm rings direct to the receiver. After that, I started loosing pressure, maybe 100 - 200 psi a week. My other PCP's have held solid.

Did I somehow torque the receiver that caused it to develop a weak spot in the system? Or am I being paranoid? I just took the scope off and charged it 3k psi to see what happend over the next few days...

 

[DonaAna1]

I have a prod and it developed a leak at the fill port.

Soap and water will help you find the leak.

 

[steve-kville]

I could just be spoiled. I have 4 Benji products and they all appear to hold solid except for this P-Rod



(I see I wrote P-Mod in the OP. My mistake!!)

 

[dizzums]

doubt it .. the cylinder is a self contained unit .. commomly theres 2 spots they leak the gauge or the fill adapter .. usually the gauge ..put alittle soapy water around the threads and watch under a good light, with it full ..if it leaks try a slight tweak on the gauge watching the bubbke situation, think its a 15/16 ... dont get too crazy, if alittle bit wont do it it needs a new seal ..

 

[PeeWeeDaddy]

Fill port, gauge and the poppet.

If it is the first two, easy fix.

The third is easy too, but…

I have had to replace two poppets.

Now that I have spares, they never break..

Motorhead is making own poppets out of PEEK…

They never wear out.

 

[Ezana4CE]

doubt it .. the cylinder is a self contained unit .. commomly theres 2 spots they leak the gauge or the fill adapter .. usually the gauge ..put alittle soapy water around the threads and watch under a good light, with it full ..if it leaks try a slight tweak on the gauge watching the bubbke situation, think its a 15/16 ... dont get too crazy, if alittle bit wont do it it needs a new seal ..

@steve-kville I’ve found what he said to be true from reading and my experience with Crosman/Benjamin air guns. It’s definitely a good place to start. If it’s a year old and you bought it new it should still be under warranty. I suggest that you call Velocity Outdoors (Crosman) 800-724-7486 for replacement parts. Dealt with their warranty department on multiple occasions. They ship parts out pretty fast. My last shipment from Crosman in New York took 2 days to reach Texas via USPS.

 

[steve-kville]

Thanks for the replies. I topped it off this morning and we shall what it does overnight.

 

[PeeWeeDaddy]

Steve,

Behind the gauge is a weeper hole, typically they will leak there.

For everything else put a balloon over the muzzle and wait…

 

[2L8]

Steve, if you need a fill probe O-ring DM me and I will send you a couple to help solve your problem. 

Patrick

 

[Dairyboy]

Yeah the scope thing was just plain coincidence. Like others have mentioned can be the fill port or the gauge weeper hole. I'd bet the gauge but have had issues with the fill port in the past on an older Mrod also.