2001 GMC 3500 8.1L engine with no fuel pressure. In this video I am showing how to test the fuel pump electrical circuit using a test light and scan tool.

Engine Performance Diagnostics chapter 16

Symptoms
no start
no fuel pressure

Fix
replace faulty fuel pump

Tests shown
how to measure fuel pressure
how to test the fuel pump relay
how to test for proper power and ground to a fuel pump
how to test the transfer pump
how to test for a proper ground on your test light
how to command a fuel pump relay to turn on with a scan tool
how to test the computers control of the fuel pump relay
how to determine fuel pump wiring without a diagram

Tools used
scan tool Autel MS905 MaxiSys Mini Diagnostic System
https://www.jbtoolsales.com/autelms9...
incandescent test light https://www.jbtoolsales.com/otc3633...
backprobing tools AES' Electronics Accupuncture Probes http://www.aeswave.com/cart.php?m=aff...
S.U.R. & R FPT22 Deluxe Fuel Injection Pressure Tester Kit
https://www.jbtoolsales.com/surrf...

Playlist
(Chapters 14, 15,16) Fuel Delivery and Fuel Pressure Testing
   • (Chapters 14, 15,16) Fuel Delivery an...  

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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
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Disclaimer:
Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.