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 - digital multimeter - incandescent test light - backprobing pins Playlist - (Chapters 14, 15,16) Fuel Delivery and Fuel Pressure Testing Related videos - Fuel Pump Electrical Circuits Description and Operation - Fuel Pump Relay Problem - How to test and fix a PGM-FI main relay on a Honda, Acura - How to test an electric fuel pump (1997 4.3L Chevy Blazer CPI) - Fuel pump electrical circuit diagnosis (no fuel pressure testing) GM For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at 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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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 Relays- EricTheCarGuy
How To Test Relays- EricTheCarGuy How to test relays is a video about just what it says. Every once in a while you need to test a relay and when you do it's important to check it thoroughly, if not you may think it's good and it's not, just because it 'clicks' doesn't mean it's good because that's only part of the equation. Yes you can swap it out with a known good relay and that will save you time but if you don't have a known good then this test should do the trick for you. This video is also a good way to get to know what's inside a relay and how it works so if you're curious about that this would be a good video to watch. If you want to see a video on basic electrical diagnosis click here. Visit me at: --- Click below and Stay Dirty Visit me at Visit EricTheCarGuy Forum Visit my Facebook Page: --- Stay dirty ETCG Due to factors beyond the control of EricTheCarGuy, it cannot guarantee against unauthorized modifications of this information, or improper use of this information.  EricTheCarGuy assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. EricTheCarGuy 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 EricTheCarGuy, 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 EricTheCarGuy.

GM no start no fuel troubleshooting
visit me @ 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

How To Tell If Your Fuel Pump Is Bad
Scotty Kilmer, mechanic for the last 46 years, shows how to find out if your car's fuel pump has gone bad. Some simple tests are all that's needed, and you don't want to guess with a new pump without testing, as some can cost over a thousand dollars to replace. And, If you like my car help, be sure to watch my live car talk show every Saturday morning at 10 AM CST on YouTube. I answer your car questions LIVE there. Just check it out at eature=c4-overview . And remember, every TUESDAY I upload a new video, so don't miss them.