Comment on P0093 – Fuel system leak -large leak detected by John

J

John

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#1
Same code on this 2008 GMC W5500 Truck with 4HK1 engine, We check the tank along with the fuel lines and replace the fuel filter. We next change the SCV and backprobe its connector which seems to be ok, After no success we then inspect the injectors for loose connection and test the engine oil for diesel contamination in the event we had a stuck in open injector. Our scanner are showing fuel pressure desired and actually within good tolerance of each other until the truck goes into limp mode somewhere around 1800rpm and above. Starting and throttling is perfect. Not sure what next to do. Any help is much appreciated

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grcauto

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#2
I would do a volume and balance test of the injectors. Probably one or more are leaky.