I don't have one those high buck things (like only contractors can afford) but I don't use the axle. I use a smaller rod that don't drag on the seals and it always have seemed liked it worked OK. I have never had a vibration anyway.
My wife had a 93 Escort GT back in the day that had the fuel filter mounted on the firewall. The fittings were plastic with just a small plastic C clip holding it together. She had the car a long time and never a leak there.