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Bosch 044 Fuel Pump is Loud

Have a few miles on my newly installed Bosch 044 rear fuel pump in an efi 930. From day one the pump has been ridiculously loud and I am questioning whether there is an issue causing this. Searching the web, you can read that many feel the pump is loud. Can a few of you weigh in on this?

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Old 11-04-2014, 12:18 PM
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If I get down next to the driver door I can hear it, but I wouldnt call it loud. Mine is working a lot harder since i'm still running CIS as well. I had my first 044 go out on me with about 1000 miles on it, but it didnt sound any louder before it died.
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Old 11-04-2014, 12:37 PM
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This 930 has a very loud exhaust and if I am driving with rpm less than 3000 I can hear the pump. Super loud when you prime it before bumping the starter.
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Old 11-04-2014, 12:47 PM
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Lots of fakies out there. You sure it's real bosch?
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Old 11-04-2014, 01:49 PM
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Mine are super loud.
Old 11-04-2014, 02:07 PM
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Quote:
Originally Posted by Tippy View Post
Mine are super loud.
After some comments out there on the web, I was trying to get comfortable with the noise. Then today, in speaking to Richard Clewett, he was concerned with the sound level. Tippy, have yours been loud for quite a while?
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Old 11-04-2014, 02:27 PM
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There are a lot of fake ones out there that were made in China.
I used to think if it had the right number and letter markings stamped into it and said Bosch and made in Czech Republic it's a real one. Now I'm not sure if the Chinese ones might say that too and there may be no way to tell them apart unless you know you have a real one in your hand next to a fake one and can see a difference.
So...
If you can return it, do it. and do it again and again until you get a relatively quiet ones.

I've returned two or three made in Czech Republic Bosch 044 pumps I've had because they were ridiculously loud after 10 to 20 minutes of running. You could hear them buzzing/screaming from over 200 feet away and it's unbearable inside the car.
After replacing the second front pump I just leave the heavy steel cover off the bottom of the car because I got tired of unbolting it and bolting it back on to access the stupid pump. Don't need it anyway.

I think part of the problem is they're made for current day EFI that runs around 40-50psi and not 30 year old CIS that runs up around 100psi and that puts a lot more strain on the fuel pumps. Another words they are the wrong fuel pumps for CIS.

The noise may be fuel cavitation or fuel vaporizing into little tiny bubbles in the rollers of the pump as it overheats and the internal pressure valve opens and some of the fuel is recirculating around and around inside the pump and getting hotter and hotter while it does it.. The fuel pump is cooled by the fuel flowing through it. Fuel flowing right around the spinning motor armature, the brushes, and the bearings.
If the pump overheats the fuel partially vaporizes and you get the buzzing noise.

Anyway, after returning 2 or 3 of them and getting new replacements I've got two of them that are not too bad at the moment.
Old 11-04-2014, 02:48 PM
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I got mine from amazon, and they have a great return policy. All automotive items are covered for 1 year warranty, and since its had fuel in it they dont want you to ship it back. After a 1 minute chat with the representative I had a new one on its way. I also think its unlikely that Amazon would be selling counterfeit products.
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Old 11-04-2014, 04:04 PM
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Quote:
Originally Posted by dos531 View Post
I got mine from amazon, and they have a great return policy. All automotive items are covered for 1 year warranty, and since its had fuel in it they dont want you to ship it back. After a 1 minute chat with the representative I had a new one on its way. I also think its unlikely that Amazon would be selling counterfeit products.
That is good to know. I did not realize that there were a lot of fakes out there. I believe mine came from an authorized dealer but I am sure no extended return policy. Sounds like quiet is attainable.
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Old 11-04-2014, 04:11 PM
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Quote:
Originally Posted by dos531 View Post
I got mine from amazon, and they have a great return policy. All automotive items are covered for 1 year warranty, and since its had fuel in it they dont want you to ship it back. After a 1 minute chat with the representative I had a new one on its way. I also think its unlikely that Amazon would be selling counterfeit products.
Amazon is really good. I like buying from amazon for the reasons you said and also because sometimes they have the best prices and they seem to always have free shipping and they take accumulated rewards points from buying things like gas and groceries as cash from some credit cards.
Old 11-04-2014, 04:50 PM
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Quote:
Originally Posted by tailwind22 View Post
After some comments out there on the web, I was trying to get comfortable with the noise. Then today, in speaking to Richard Clewett, he was concerned with the sound level. Tippy, have yours been loud for quite a while?
At least a decade
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Old 11-04-2014, 04:51 PM
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Make sure the rubber mounts are in good shape, the pump and hose ends aren't touching metal and all the hoses and wires have a little slack.

Any pump to metal contact acts like an amplifier.
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Old 11-07-2014, 11:50 AM
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I have to question the authenticity of many pumps sold online when they retail for less than a Bosch North America Master Distributor says he pays for them, and he buys pumps by the pallet load.

Jeff -- got that factory rubber pump housing in the mail to you, that'll definitely help muffle the pump.
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Old 11-10-2014, 08:21 AM
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Make sure that the noise is not caused by improper or worn out mounts. I had one pump that was mounted incorrectly on a car I bought. We had it moved to a rubber mount system, and I can barely hear it now even with the car not running!

-Wayne

Old 11-10-2014, 10:48 PM
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