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post #1 of 4 (permalink) Old 11-13-08, 07:36 PM Thread Starter
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high pitch hum in rear

i recently bought a 1990 grand marquis with 98000 miles. the car sat for past 6-9 months other than being started every once in awhile to keep battery charged because previous owner was ill. every thing seems ok other than that overdrive shudder i see others have talked about on the site and slight hesitation sometimes in overdrive. but there is a high pitch hum coming from the rear of the car it goes away sometimes but is almost always there. any thoughts on what this might be

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post #2 of 4 (permalink) Old 11-14-08, 10:04 AM
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Re: high pitch hum in rear

From my experience, I have found it is the fuel sending unit/fuel pump, i have owned a 1987, 1992, 1993 all with the same hum

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post #3 of 4 (permalink) Old 11-14-08, 08:41 PM Thread Starter
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Re: high pitch hum in rear

does this mean it is going bad? ive had a few go bad on me but never had a hum before. is this just the noise they make. I just had to change one a couple weeks ago in the escort i'm hoping i dont have to change another one. its starting to get cold out here and the garage doors need to stay open on this job so if it is i need to change it pretty soon
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post #4 of 4 (permalink) Old 11-16-08, 03:49 AM
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Re: high pitch hum in rear

it just seems to be that way i have replace them in two of my cars and they always hum. as long as its humming it working

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