I have a T770 with a no start issue this tractor died on me in the filed I got it back the shop here and seen the primmer bulb wouldn't stay tight did some research and seen these are bad about the rubber fuel lines leaking so I replaced every fuel line the primer bulb and the filter and filter housing and got it started it then had a little bit of a fuel knock i was in the process of working that out when it quit it now wont start wont smoke or anything just turns over iv primed it and bleed injector iv got good fuel to the injectors but no smoke or anything iv even hit it with some either to see if it would do anything and nothing again any ideas/help would be greatly appreciated also the only code its throwing is rail pressure control fault