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2002 GMC Sierra fuel related

Tiny
GREGNEXA
  • MEMBER
  • 2002 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 100,594 MILES
Truck was parked two nights ago with low fuel. Next time I tried to start it, it would not. I assumed the 10 month old fuel sending unit went bad and warrantied the sending unit(oem part). Made no difference. I have noticed the fuel gauge doesn't work(currently has about a half tank of fuel) and the highlight on shift indicator that tells what gear it's in is no longer there. "Fuel" fuse shows power on both sides with key on, "Fuel" relay shows no power at all where it would plug in to fuse box. I jumped from DRL relay to fuel only to get truck home and it did start. However, once I put truck in reverse to move it, truck died and i'm back with the same problem. Any advice?Thank you for your time.
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Thursday, August 26th, 2010 AT 6:09 PM

10 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Terminal 30 at the fuel pump relay, shows to be hot all the time.


https://www.2carpros.com/forum/automotive_pictures/170934_gmc_sierra_fuel_pump_relay_1.jpg

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Friday, August 27th, 2010 AT 2:44 PM
Tiny
GREGNEXA
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  • 6 POSTS
No, terminal 30 does not show hot with key on, previously I jumped from drl relay(#30) to fuel(#30) and truck started until I moved from park position
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Friday, August 27th, 2010 AT 4:34 PM
Tiny
JDL
  • MECHANIC
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It gets voltage from the ecm B fuse.
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Saturday, August 28th, 2010 AT 9:16 AM
Tiny
GREGNEXA
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  • 6 POSTS
Where is the ecm b fuse located? Is it in fuse box under hood?
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Saturday, August 28th, 2010 AT 12:30 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Yes, underhood fuse block. Your owners manual should give fuse location and label, if not, maybe I can find a picture?
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Saturday, August 28th, 2010 AT 12:45 PM
Tiny
GREGNEXA
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  • 6 POSTS
If u could find a picture that would be great, seeing as my truck did not come with a owners manual. I appreciate all your help!
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Saturday, August 28th, 2010 AT 12:59 PM
Tiny
GREGNEXA
  • MEMBER
  • 6 POSTS
Do you have any idea on what would've caused this to occur?
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Saturday, August 28th, 2010 AT 1:01 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
I'd have to check for voltage at the ecm B fuse. Maybe a wiring circuit problem? If the fuse is blown, a faulty fuel pump might cause it. In the picture, fuse number 30-- 20 amp should be the ecm B fuse. You should be able to look at an online owners manual for free. gmownerscenter.yahoo.com, try that link.


https://www.2carpros.com/forum/automotive_pictures/170934_sierra_underhood_fuse_box_1.jpg

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+1
Saturday, August 28th, 2010 AT 3:03 PM
Tiny
GREGNEXA
  • MEMBER
  • 6 POSTS
Dude, I dont know who you are or what state you live in, but you are the man! Truck is back up and running. Thank you so much for your help and if you're ever in tulsa please let me know, I owe ya a cold beer and a steak dinner. Thanks again!
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Sunday, August 29th, 2010 AT 6:48 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Glad you got it going your way.
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Monday, August 30th, 2010 AT 8:49 AM

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