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My '95 250 (details in signature) is shaking not vibrating but shaking. At 45 to 50 mph in overdrive it starts shaking. it only happens when your running on flat road never up or down hill. it will stop if you give it some throttle an turn it up above 50 or back out below 45, or punch the od off button and maintain the same speed and it will quit. punch the od back in and it will start again.
now the fuel pump is leaking i'm thinking mabe air in th fuel system or torque converter out of balance.
check your center bearing carrier grab the driveshaft and pull push see how much it moves in the rubber mount Oh btw the fuel pump leaking is it the lift pump on top under the turbo if it is its a easy fix with out taking out the turbo and no your not getting air in the system because i bet its leaking out the weep hole on the bottom and you other pump in the tank feeds that one you really have 3 pumps tank, lift, and injection i got a 97 cc first was the lift pump then the air pump then it started shaking it was the center bearing