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P0171 P0174 Low fuel pressure?
We have this truck that has these dtc's. The dtc was cleared and fuel filter was replaced 193 miles ago. Naturally it came back on. My main question is about fuel pressure. The spec is 55-62 PSI. It had 42 PSI and 48 PSI with the regulator unplugged. We replac... Login to read more. 
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| Engine | 4.8 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
2002 Chevrolet Silverado 1500 4.8L
| Engine | 4.8 L |
| Trans | 4-speed Automatic (Electronic) |
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