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One concern on the safety, will a moving piston sliding on a shaft seal ignite the nitro?
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Shouldn't be a problem, my understanding is that nitro is only shock sensitive if it is very high purity. There were some serious accidents with 99+% purity nitro in rail tank cars that detonated when they were being "humped".
(humping -- practice of letting rail road freight cars roll down a siding to sort cars. If the car gets going too fast, the impact when it crashes into other cars at the bottom of the hill, can be a pretty good collision)
Speculation was that the liquid nitro sloshed forward in the tank and water hammered when it hit the dead end creating a superheated compressed vapor bubble initiating the explosion.
Your best bet would be to touch base with Sunoco fuels or someone experienced with handling nitromethane.
The above incident involving Nitromethane in freight cars is commonly mentioned in hazardous materials training courses for fire fighters here in the U.S. in fire science college classes.
Larry