1999-2007 General QuestionsGeneral questions related to 1999-2007 Super Duty trucks. If it doesn't fit the other categories, post it here. Gas engine discussion that pertains to all models is allowed. Specific gas engine questions should use the Gas Engines forum.
ok my truck in my sig is doing a weird thing. it has less power when i have a quarter tank of fuel, but when i fill it up all the way, it runs like a raped ape. what do ya'll think would cause something like this?
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early 1999, 7/98, F-250 7.3L, 250,000+ miles, 4x4, triple disk torque convertor, AFE dryflo home made cold air intake, straight pipe exhaust, superchips tuner (stuck on high performance tune,because someone stole the tuner out of my truck), 4.7K mod, Glow shift gauges (pyro, boost, egt), CCV mod, 3in of lift in front, 1in in back w/ 2009 SD rims w/ 2in wheel spacers wrapped in 325/65/18 Fierce Attitude MT, aftermarket headlamps w/ LED's, ranchhand grill guard, 03' front bumper w/ fog lights, gooseneck hitch
At around 1/4 tank the fuel pickup will be getting air in the fuel. This is why so many folks eliminate the in-tank screens and relocated the pickup tube in tank.
Essentially, the return line dumps foamy fuel right over the pickup in tank. Once you're down to 1/4 tank, the pickup starts to get a significantly higher amount of the foamy fuel to feed the engine.
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New truck: 2002 PSD 4x4, CC, XLT, F350 dually. Air bags, 6.0 trans cooler, Fleetrite ELC, ISSPRO guages, DB HT starter (no more), Superchips 1705 tuner, Reese Titan, AIS, IPT pre-pump filter kit, in-tank mods, and much more to come.
Old truck: 2000 PSD 4x4, ext cab, XLT, F-350, auto, V-code springs, air bags, coolant filter, 203 thermostat, Fleetrite ELC, DB Alternator, DB high-torque starter, Tru-cool Max-cool trans cooler, B&M trans temp gauge, 47 gallon Titan tank, IPT pre-pump filter kit.
If go to the installation guide at ITP and look at picture 10 at the bottom you will see that the fuel pickup has a small one way valve made of rubber (I guess). When I did the kit that little valve insert was almost gone. So when I got close to 1/4 of a tank it was sucking air.
yea it sounds as if that is my issue, because thats exactly what its doing. thanks!
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early 1999, 7/98, F-250 7.3L, 250,000+ miles, 4x4, triple disk torque convertor, AFE dryflo home made cold air intake, straight pipe exhaust, superchips tuner (stuck on high performance tune,because someone stole the tuner out of my truck), 4.7K mod, Glow shift gauges (pyro, boost, egt), CCV mod, 3in of lift in front, 1in in back w/ 2009 SD rims w/ 2in wheel spacers wrapped in 325/65/18 Fierce Attitude MT, aftermarket headlamps w/ LED's, ranchhand grill guard, 03' front bumper w/ fog lights, gooseneck hitch
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