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****URGENT HELP REQUESTED****Fuel In EXHAUST****

This is a discussion on ****URGENT HELP REQUESTED****Fuel In EXHAUST**** within the General Help forums, part of the LSx Technical Help Section category; I Recently completed my LS Conversion wiring and went to start my dad's 1967 Olds Cutlass with 4.8LS (Engine from ...

  1. #1
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    ****URGENT HELP REQUESTED****Fuel In EXHAUST****

    I Recently completed my LS Conversion wiring and went to start my dad's 1967 Olds Cutlass with 4.8LS (Engine from 2003 Chevy Silverado) Conversion and smelled fuel, I luckily had the exhaust and headers separated.

    I saw fuel spraying out of the passenger side of the header. I Swapped injectors for Cylinder #4 & #6 after smelling fuel on the plugs. I restarted the engine and the fuel still leaked unburned raw fuel.

    Any Ideas on how I should fix?

    Thank you in advance for ANY help.

    John

  2. #2
    Spaz is My Mentor SMWS6TA's Avatar
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    Navy Blue Metallic
    98 T/A w/ mods, 00 FBVert

    Are these new injectors or came with the engine?

    Is this the same ecm that came with the engine or a different one? If different one did it get a tune installed to adjust for the engine requirements? For example a 5.7/6.0 ecm tune will be greatly different for a 4.8.

    Once you figure out why you have so much fuel in the cylinders fix, check your oil. If you flood the cylinder enough you can thin the oil to the point it can cause serious issues like wipe the cylinder walls (ring failure) wipe the bearings etc...
    http://www.ls1.com/forums/f7/my-6-liter-build-174257/

    http://www.ls1.com/forums/f8/my-8-8-rear-build-165553/

    6.0L Block - Forged 403 built, breaking it in , Polluter Stg3 Cam, FAST 102mm Intake, NW102 TB, MSD wires, NGK TR6 plugs, Truck Coil Packs, LS3 Fuel Injectors, CC Pacesetter LT Headers, TS&P ORY, QTP e-Cutout, Magnaflow Muffler, 104mm Air Lid & Line Lock, Catch Can, Stage 2 T56 w/Viper shaft, PRO 5.0 Shifter, Tick MC, SPEC Stg3+ Clutch, QT SFI BH, MWC DSL, UMI: Sway Bars, SFC, PHB, LCA's, LCA Relocation Brackets & TA, Belstein Shocks, Hotchkis Springs (1" Drop), YR1 Snowflake Wheels wrapped in NT555 tires & Custom Fab Ford 8.8 rear w/4.10 Yukon Gears, WSQ Hood, 3"CM Strange Eng Drive Shaft.

    00 FB Vert - Stock

    Horsepower never lies, but is often lied about!

  3. #3
    Super Moderator pajeff02's Avatar
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    Injector is either stuck open or you have a wiring issue.

  4. #4
    Spaz is My Mentor SMWS6TA's Avatar
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    That's what I was trying to get to.


    Is it just one cylinder or all of them?

  5. #5
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    Hello All,
    So after a great deal of research, I was able to resolve the fuel in my combustion chambers and out through my exhaust. When installing a truck engine into any vehicle, its critical to know if the engine fuel rails have a return to the tank line. Plus while the engine is out and being prepared to be installed, replace the inline fuel regulator, which i on the driver's side of the fuel rail. Plus, I installed the Corvette external fuel pump which is already regulated. So If installing a truck engine be sure to choose which option you will use to regulate your fuel, the corvette pump or the regulator inline on the fuel rail of the truck engine.

    Install an LS Engine in Any Car - https://tii.ai/LSSwapForAnyCar

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    Install an LS Engine in Any Car - https://tii.ai/LSSwapForAnyCar

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    Install an LS Engine in an car

    Install an LS Engine in Any Car - https://tii.ai/LSSwapForAnyCar

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