Cutting Out Under Full Throttle

[Bigshowdawg]

Hey guys I have an f550 with an SCT from ID with Extreme Street. It will roll some smoke down low, but it will cut out up on top side. When it hits overdrive it will start to sputter and cut out a little. What could this be? I plan on doing the 6.4 banjo bolt and the upgraded fuel spring other than that what should I do? I also get horrible fuel mileage like 7 empty around town with the 4.88s and 37s.

[RescueF250]

Too much gear for 37's is one. Sounds like you running out of fuel up high two. Also could be injector issues for the sputtering.

[smokersteve]

Sounds like a fuel issue or injectors. Most likely fuel flow.

[Goose350]

Injector(s). Need to hook it to a good scanner to know which one(s)

[Bigshowdawg]

The truck came with the gears from the factory I have 4.30s I'm about to put in it. The truck just runs and cranks so good to be an injector but I don't doubt it.

[DieselJoE26]

Sounds Like Injectors to me. They will work great while cruising, but once u apply more throttle they will need more fuel. So either spool valves sticking, plunger/piston sticking or fuel pump..

[Bigshowdawg]

Well I towed yesterday a little jeep cherokee and 25 ft goose. The truck pulled fine, but if I was in tow haul going down a hill and it geared down and pushed the rpms up to around 2800 if I barely pushed the gas to get it to shift back out at the bottom of the hill it would act like it was on the rev limiter. Whats up with that?

[6.0psd916]

I am having the same problem

[TwinTur8os]

get a fuel pressure gauge

[Bigshowdawg]

thats what I'm thinking I got the upgraded spring and banjo bolts from ford I'm goin to try them and see if they help. I kind of doubt they will.