I presume you've solved this problem by now. But for future reference, the Marauder "Owner's Manual" explains why this may happen, and how to solve this problem!
"TIP: If your airgun is being filled from completely empty (zero pressure) the tension of the hammer pressing against the valve may keep the valve open which will cause air to leak down the barrel. This is most likely to happen with a gun tuned for a high fill pressures, where the hammer spring preload is adjusted to a high rate. In the event this occurs try cocking the bolt and leaving it in the rear (fully open) position to eliminate
the force on the valve allowing it to close. Always make certain the airgun is not loaded and there is not a pellet in the chamber."
If a drop of oil in there won't swell up the seal, you will have to send it back to Crosman. They bought all Benjamin/ Sheridan services, they repair the rifles fairly cheap. You cannot take this apart, If you do, you will be sending them the pieces anyway. They have giant presses and jigs for holding the springs. I have had a bunch of rifles sent there. Check it out.
SOURCE: Benjamin Air Rifle Model 342 not building pump pressure
Springs tend to loose their performance after a few years is air rifles. Check also the seal/o rings on the piston rod and the blow hole. I found waxing it with Vaseline makes it last longer and seals more.
SOURCE: I need a parts diagram for a benjamin sheridan
you can find parts diagram in crossman web page under other help compleat dig with part#s
SOURCE: need parts for a benjamin franklin air rifle moel
http://www.crosman.com/airguns/service/repair
I couldn't find the model 317, But crosman bought benjamin, sheridan. Check it out.
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