Fuel pump constant humming noise

3500 Views 9 Replies 7 Participants Last post by GTVMach1, Oct 30, 2007

GTVMach1

Discussion Starter · Oct 23, 2007

Hi,

Has anyone heard a constant humming noise in the rear of an '84 GTV 6?
I am assuming its from the fuel pump (how would i know if its the one internal to the tank or external to the tank? When does the humming noise level (can be heard clearly when the key is turned without starting engine) l indicate that a replacement is needed for fear of getting no fuel /low fuel pressure to the injectors and getting stuck somewhere?

Any advice on where to get pumps if replacement is warranted? IAP?

Happy motoring

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GVVGTV6

· #2 · Oct 23, 2007

Actually you should be able to hear it - if you don't something isn't right. If it's humming it means it is working. It is funny you mention this though as the other morning mine seemed to be a little louder of a hum than usual, I almost believe it's the onset of cooler weather! All I know is I've only replaced mine once and the car is about to turn 200K miles.

GV

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alfettish

· #3 · Oct 23, 2007

You shouldn't hear it unless the AFM is operating. Just turning the key to on should not activate the fuel pump. Unless it's been modified.

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mjr

· #4 · Oct 23, 2007 (Edited)

exactly, are you pushing the gas pedal before you start? this is a BIG no no on the V6, dont push the pedal at all, unless you feel like spending the morning re-seating your plenum. it doesnt open the afm, but I mention it because youre obviously not familliar with injection workings of this car, so just another thing to have in mind when starting up. Sounds as if your AFM flap has been tampered with, if the pump is coming on straight away.

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sh0rtlife

· #5 · Oct 23, 2007

i will say this about cold weather and pumps...sometimes they will make more noise in cold weather or extreem full or extreem empty (in tank vs out of tank)

and yeah the fuel pump should NOT be on unless the engine is running unless someones done something they shouldnt have

ever wonder why the gtv6 has a black plastic cover?...so that if the plenum blows off from someone starting the car while pumping the gas pedal the plenum can blow off break the plastic but not damage the hood

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alfettish

· #6 · Oct 23, 2007

sh0rtlife said:
ever wonder why the gtv6 has a black plastic cover?...so that if the plenum blows off from someone starting the car while pumping the gas pedal the plenum can blow off break the plastic but not damage the hood

Mine's red

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fragmaster170

· #7 · Oct 23, 2007

Isnt the in-tank pump only really used to help out at low RPM?

I had one go bad in an E30 BMW I owned and the dang thing kept on trying to bog down and die below 1500rpm or so.

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jack_linguini

· #8 · Oct 23, 2007

it is not an in tank pump. it is an inline pump.

It's just hanging out back there in metal clamp.

Mine was buzzing when I first bought my car. I replaced it
w an OEM bosch fuel pump. still some buzzing.

buzz buzz... I'm a little fuel pump

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mjr

· #9 · Oct 23, 2007

The buzzing isnt an issue, if it was drawing huge current, the fuse would blow regularly. If that isnt happening, I really wouldnt worry about it. I would address the fact that it runs with the ignition on though, that is a bit of a safety issue, and a fire hazard if you had a crash.

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GTVMach1

Discussion Starter · #10 · Oct 30, 2007

Thanks for all the replies

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