We installed a different fuel pressure spring in the return. This was done over 2 years ago, to smooth out the idle, and cold weather starts. It also brought the fuel economy up just a touch. It is still with in Specs from International and ford.
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Thank you and have a great day, Troy Detweiler
I have a '99 F 250 7.3L Diesel w/ a 6 speed Tranny and 4x4.
Mods: Amsoil dual bypass oil filters, Amsoil air intake mod DIY, fuel preasure spring mod(70psi), FU Chip and Burner , 3.73 rear gears, leveling kit (DIY), Stabilizer bars on the rear axle (DIY).
'02 F 350 7.3L, 6spd,4x4,CC, Dually- Just bought 4-15-11
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