GM Fuel Pump Relay Testing

The vehicle being tested is a 1999 Chevy Suburban with no fuel pressure. This truck had a new fuel pump installed and still did not have fuel pressure. In this video I will show you how to troubleshoot this entire fuel pump electrical system, including the fuel pump relay, wiring and computer. Engine Performance Diagnostics chapter 3 page 26 Symptoms - no start with good spark - no fuel pressure - no trouble codes Fix - repair wiring to the fuel (new pump was wired backwards Tests shown - how to test a fuel pump relay in a power distribution box. - power side switched circuit design description and operation. - Fuel pump power and ground testing. - how to manually jump a fuel pump from the fuse box - how to test a fuel pump relay - relay pins (what each one does and how to test them) - how to verify computer control of the fuel pump relay - bias voltage (what is it, how to use it, how it can cause misdiagnosis when using a voltmeter) - wiring diagram review of a fuel pump relay circuit in my classroom (a ScannerDanner premium segment) - how to measure fuel pump current - what sets a fuel pump relay control trouble code Tools used - ATD Tools 5519 Auto Ranging Digital Multimeter https://www.jbtoolsales.com/atd-tools-5519-auto-ranging-digital-multimeter-with-protective-holster#oid=1014_1 - incandescent test light https://www.jbtoolsales.com/otc-3633-mini-circuit-tester#oid=1014_1 - backprobing pins AES' Electronics Accupuncture Probes http://www.aeswave.com/cart.php?m=affiliate_go&affiliateID=60df1b5cf6e5582af6ff81c728f42d0d&go=http://www.aeswave.com/AES-Electronics-Accupuncture-Probes-p9474.html Playlist - (Chapters 14, 15,16) Fuel Delivery and Fuel Pressure Testing https://www.youtube.com/playlist?list=PLAFYVCyenqcrstVqfSc1PCbQ1pebuNIO6 Related videos - Fuel Pump Electrical Circuits Description and Operation https://www.youtube.com/watch?v=Rqtfrx-HeD0 - Fuel Pump Relay Problem https://www.youtube.com/watch?v=CEjmo_qT4yQ - How to test and fix a PGM-FI main relay on a Honda, Acura https://www.youtube.com/watch?v=X5Qp-ToR8KA - How to test an electric fuel pump (1997 4.3L Chevy Blazer CPI) https://youtu.be/yjQY613sql4 - Fuel pump electrical circuit diagnosis (no fuel pressure testing) GM https://youtu.be/ZgNY3ZpjSsU 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. Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium right here on YouTube. There is a 14 day free trial. On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!

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GM no start no fuel troubleshooting
visit me @ http://toolsandtime.com In this video i give an example of one way i go about trouble shooting a no start issue when i have limited resources. on a 95 Chevy Tahoe This isn't how I usually go about it however I wanted to give an example of what you can do with just the basic tools and schematics to trouble shoot a no start issue hope you enjoy





Relay test
Access to test a relay in place can be difficult. Here's a simply way to test the actual relay mounted in the relay box





How to test an electric fuel pump - using a test light
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/autel-ms905-maxisys-mini-diagnostic-system-with -vci-and-connector-kit-usa-version#oid=1014_1 - incandescent test light https://www.jbtoolsales.com/otc-3633-mini-circuit-tester#oid=1014_1 - back-probing tools - AES' Electronics Accupuncture Probes http://www.aeswave.com/cart.php?m=affiliate_go&affiliateID=60df1b5cf6e5582a f6ff81c728f42d0d&go=http://www.aeswave.com/AES-Electronics-Accupuncture-Pro bes-p9474.html - S.U.R. & R FPT22 Deluxe Fuel Injection Pressure Tester Kit https://www.jbtoolsales.com/s-u-r-r-fpt22-deluxe-fuel-injection-pressure-te ster-kit-1#oid=1014_1 Playlist - (Chapters 14, 15,16) Fuel Delivery and Fuel Pressure Testing https://www.youtube.com/playlist?list=PLAFYVCyenqcrstVqfSc1PCbQ1pebuNIO6 Related videos - How to test an electric fuel pump (1997 4.3L Chevy Blazer CPI) https://youtu.be/yjQY613sql4 - Low Fuel Pressure from a bad fuel pump ground (Ford Ranger) https://youtu.be/rQ7tvIxQSt0 - How to test an electric fuel pump (no fuel psi testing) Ford https://youtu.be/F2ZXhai-x9k - Fuel pump electrical circuit diagnosis (no fuel pressure testing) GM https://youtu.be/ZgNY3ZpjSsU - No Start No Fuel Pressure Troubleshooting https://youtu.be/R9PzG_FiNhY - How to test fuel pressure, injector pulse and spark with basic tools https://youtu.be/SUxagOAVS5M 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. Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium right here on YouTube. There is a 14 day free trial. On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!





how to make a bad fuel pump work
Fuel pump tests proved the fuel pump to be the problem, but I was able to get it to work, and use it anyway, and no, it did not involve kicking or banging.




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