1997 Suburban humming sound from rear

1997 GMC YUKON
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BLUESBRO
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1997 GMC Surburban with 87K and 5.7L. The humming is present only when the engine is running, but does not change pitch with engine RPM. It sounds like it is coming from the fuel tank and I think it is the fuel pump. I removed most of the fuses one at a time and the noise persisted. When I removed the fuel pump relay the noise stopped, of course so did my engine.

Do you think I should replace the fuel pump, and how big of a job is it?

Thanks a bunch!
Jan 3, 2006 at 3:12 PM

What to check next

Diagnostic guidance. Suggested checks and possible repairs are separate from the owner's reported results.

Have pump performance assessed if the noise is new or changing, rather than replacing the pump from sound alone. Investigate the interior-light battery drain separately.

Guidance references and applicability

Source: This question and its visible discussion. The roadmap distinguishes the original owner's reports from other participants' experiences; proposed follow-up is editorial guidance, not a confirmed diagnosis. HELLA: Injection-valve diagnosis https://www.hella.com/techworld/en/technical/sensors-and-actuators/injection-nozzle/ General pressure-test background; use the installed fuel system specifications.

Read the replies · Discussion summary and reported outcome

AI-ASSISTED GUIDANCE · REVIEWED BY 2CARPROS
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PHIL
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I had 140.00 on my first fuel pump. Just replace the fuel filter if its been a while and drive it like you own it. My aftermaket fuel pump is noisier than the stock one but it works fine.
Jan 4, 2006 at 7:42 AM
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WIMPY
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my 97 sierra has made that very same noise since day one no biggie just a little annoying from time to time
Jan 4, 2006 at 12:53 PM
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BLUESBRO
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That makes me feel better. I just bought it off a lot. I probably will replace the fuel filter along with the tranny fluid and check the brakes. Apparently it has some sticky door switches as well; I found the battery near dead with the interior lights on this morning.



[quote:45503e2178="wimpy"]my 97 sierra has made that very same noise since day one no biggie just a little annoying from time to time[/quote:45503e2178]
Jan 4, 2006 at 2:20 PM
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PALCO
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when ever I buy a new to me used car I just go thru it and change all the fluids and filters. to know my base line on service. and most people don't know to change other fluids than the eng. oil. differential, trans., front diff., power steering (some have a internal filter that can be serviced). fuel etc. i don't know when or if the last owner did
Jan 5, 2006 at 12:40 PM

Discussion summary

1997 Suburban humming sound from rear

A newly purchased 1997 Suburban had a hum near the fuel tank only while the engine ran. Removing the fuel-pump relay stopped both the sound and engine. Other owners described similar noises; the owner planned maintenance and also reported interior lights draining the battery.

Reported outcome: No pump test or repair was reported.

Other vehicles' noisy but functioning pumps do not establish that this pump is healthy. Relay removal also stopped the engine, limiting that observation.

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AI-ASSISTED SUMMARY · REVIEWED BY 2CARPROS
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