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Discussion Starter #1
Did a fuel pres test 05 8.1Lvortec c5500 im under 50lbs 48-49 motor rumning when i turn key off it quickly drops help me guys
 

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The great white Canadian
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1,633 Posts
Fuel pressure should be 58psi on that motor, and it shouldn't drop off like that after being shut off. Sounds like the regulator is failing.
 
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