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Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 1685
Experience:  GM Grand Master Technician 2007. 14 year experience.
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GMC Sierra 1500 Classic SL: , Replaced the fuel pump

Customer Question

Hello,
Replaced the fuel pump on my 2000 GMC Sierra classic and still doesn't work. Checked the fuse relay and had power check at the pump had no power. When checked the relay again had no power. What's going on? What else can I do?
Submitted: 2 years ago.
Category: GMC
Expert:  Gm Tech (Cam) replied 2 years ago.
Hi there. Can I get your name please?
Customer: replied 2 years ago.
Jessica
Expert:  Gm Tech (Cam) replied 2 years ago.
Jessica, did you remove the relay and inspect for corrosion/discolouration on the terminals?
Customer: replied 2 years ago.
Yes and replaced the relay as well
Expert:  Gm Tech (Cam) replied 2 years ago.
OK, if there was, did you look at the terminals in the fuse block? Is the terminal discoloured and the plastic melted?
Customer: replied 2 years ago.
No everything looked good
Expert:  Gm Tech (Cam) replied 2 years ago.
OK Jessica, if you take a wire and manually jump from pins 30 to 87 on the fuse block that the relay goes into, using the number stamped into the bottom of the relay, does the pump run?
Customer: replied 2 years ago.
Pump doesn't run. Had power there once on meter and now it's not showing power there on the meter
Expert:  Gm Tech (Cam) replied 2 years ago.
OK, the ECM and PCM B fuses are both good?
Customer: replied 2 years ago.
Where are those located?
Expert:  Gm Tech (Cam) replied 2 years ago.
in the underhood fuse block beside the relay.
Customer: replied 2 years ago.
Okay yes those fuses are all good
Expert:  Gm Tech (Cam) replied 2 years ago.
Does the ECM B fuse get power all the time?
Customer: replied 2 years ago.
Yes there is power all the time
Expert:  Gm Tech (Cam) replied 2 years ago.
OK, so if one of the pins 30 or 87 from the relay does not get power all the time and the fuse does, that means you have an open circuit in the fuse block.
Customer: replied 2 years ago.
Stupid question but where is the fuse for the fuel pump
Expert:  Gm Tech (Cam) replied 2 years ago.
It is the ECM B fuse.
Customer: replied 2 years ago.
Okay. What do I do about the op n circut
Expert:  Gm Tech (Cam) replied 2 years ago.
You can lift up the fuse block and see if you can repair the bad wire under it. Otherwise you can replace the fuse block.

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