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Electric fuel pump?
Vin 1 Duramax Turbo diesel - As-built would this truck have an electric fuel pump? I see this in the schematic from Alldata for this engine and the underhood PDM has a fuel pump relay which seems to have no load on it as measured at the relay switched output -... Login to read more. 
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| Engine | 6.6 L |
| Trans | 5-speed Automatic (Electronic) |
Vehicle Data
2003 GMC Sierra 2500 HD SLE 6.6L
| Engine | 6.6 L |
| Trans | 5-speed Automatic (Electronic) |
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