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1997 GMC K3500 dually 4L80 4x4
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For me, the first simple test may be the most important. Command max pressure with the scanner make sure you can hit the relief pressure hot. I don't remember the spec off hand. That test is for the pump. Intermittent P0087 usually and up being the fuel rail sensor, or wiring around here. Good luck.

Mac
 
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