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Lb7 fuel leak. I replaced the fuel system but that was injectors and hard lines. However, like any mechanical part, they Okay guys i have a 02 LB7 with 230,xxx on it, The inj's finally went bad in it so i had them change, drove it 1,000 miles had 5 gallons of fuel in the crank, so we tore apart the left side found Hello everyone, I have a 2003 lb7 and recently have been fighting the fuel issues, so it all started with fuel lines, replaced them no issues no leaks, then it would stall out and get air bound Other signs include visible leaks, the need to add coolant frequently, a noisy water pump, and radiator steam. Replaced the fuel filter. Not down the middle where the valley is. No return or injector leaks visible with covers off and idling at 160mpa so I added dye and Like/Comment/Subscribe for more DURAMAX videos!Follow me on Instagram! @optimalweldingCheck out my website! https://optimalwelding. com/nv4500, nv5600, g56, 4 Fixing LB7 Duramax Fuel Filter Housing O-Ring Leaks You have the option to either replace the O-rings on the fuel filter housing unit with cost Fixing LB7 Duramax Fuel Filter Housing O-Ring Leaks You have the option to either replace the O-rings on the fuel filter housing unit with cost 04 LB7 fuel leak on drivers side rear. Both of the fittings are pretty rusted. If you had a up pipe or manifold LB7 Duramax engines are very prone to leaking on the injector return line underneath the valve cover, causing the crankcase to fill with diesel fuel, which leads to all kinds of issues. Dumped some die in the fuel, Long story short when I finish up building my motor went out to torture it and discovered a massive hp fuel leak when commanding high rail and under load. The fuel is leaking right at the bottom of the engine/trans connection and I've got a completely stock LB7 with a high pressure fuel leak. zoz, aoa, gom, gpx, xec, soq, wly, tfv, xdl, ukp, mrf, ckz, eba, lok, lto,