i have a 99 f350 that runs fine until i try and pull a load on it . i have put new fuel pump, map sens, regulator, and fuel filter. it is a 7.3l diesel motor . has anyone experienced anything like this. thanx

 

The 7.3 has a fuel tank mounted module (sending unit ect) that has '2' cylinder shaped micro screens 'inside' the plastic module body.. (it un-snaps apart) Not just the large external suction/inlet screen.. Over time they plug and restrict fuel volume/pressure and usually shows up as a hard acell/heavy load condition for flat throttle/stumble, misfire ect.. The micro screens are cleanable/reusable.. A fuel pressure/volume test will generally show if their restricted.. My bet is that they are...