 Noisy fuel pump (carbs) |
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| Zundfolge |
 Apr 23 2009, 01:05 PM
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#1
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Senior Member  Group: Members Posts: 847 Joined: 12-August 07 From: Colorado Springs Member No.: 7,994 Region Association: Rocky Mountains  |
So I have a 2.0 with a pair of 40mm Webers, the PO installed a Mr Gasket 42S fuel pump back when he put carbs on the car many moons ago and a few days ago it died.
It always made a little bit of noise, sounded like a real loud fish tank pump (sort of rattely). Well I replaced the pump with a new Mr. Gasket 42S fuel pump and this one is even noisier. More of a high pitched whine mixed with a rattle. (IMG:http://ecx.images-amazon.com/images/I/41WM7SFV53L._SL500_AA280_.jpg) (this is what the original one looked like, the new one has a plastic body) (IMG:http://go.mrgasket.com/ProductImages/500/42S.jpg) (this is what the new one looks like) The pump is bolted to the firewall, down low about 5" to the right of where the fuel line comes out. Under it is a piece of rubber. Anyone have any idea how I can quiet this thing down ... I have a Kerry Hunter header with Supertrapp and I can STILL hear it. |
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| hydroliftin |
Apr 23 2009, 01:15 PM
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#2
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Member Group: Members Posts: 378 Joined: 8-November 06 From: Vallejo, CA Member No.: 7,180 Region Association: Northern California |
I have a Kerry Hunter header with Supertrapp and a CB fuel pump and I can't hear the pump. I think the way your pump was designed makes it loud.
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| GeorgeRud |
Apr 23 2009, 01:20 PM
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#3
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Advanced Member Group: Members Posts: 3,725 Joined: 27-July 05 From: Chicagoland Member No.: 4,482 Region Association: Upper MidWest |
As a rule, a lot of these fuel pumps are noisy, and the rubber isolating mounts can only do so much. You might check on the McMaster Carr website to see if they have some different rubber mounts that might be more compliant and stop some of the noise.
This is one of the reasons many of today's cars have the fuel pumps mounted in the gastanks themselves. I use a Piermat (sp?) pump mounted by the front steering rack under the gastank, and it's not too noisy IMHO. |
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| SirAndy |
Apr 23 2009, 01:26 PM
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#4
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Resident German Group: Admin Posts: 42,190 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
Get the CB rotary pump and no more noise. Best $50 bucks i spent when i still had the carbed 2056 ...
http://www.cbperformance.com/catalog.asp?ProductID=577 (IMG:style_emoticons/default/bye1.gif) Andy Attached image(s) 
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| jmill |
Apr 23 2009, 01:29 PM
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#5
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Green Hornet Group: Members Posts: 2,449 Joined: 9-May 08 From: Racine, Wisconsin Member No.: 9,038 Region Association: Upper MidWest |
Use a rotory pump. You might hear a whine but not the rattle. Had one of them whiz bangs for about 2 days before the rattle drove me nuts. I swapped over to a Holley red and a pressure regulator. They make smaller rotory pumps that put out around 4 psi so you wouldn't need a regulator.
Andy beat me to it. (IMG:style_emoticons/default/bye1.gif) |
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| markb |
Apr 23 2009, 01:31 PM
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#6
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914less :( Group: Members Posts: 5,449 Joined: 22-January 03 From: Nipomo, CA Member No.: 180 Region Association: Central California 
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QUOTE(SirAndy @ Apr 23 2009, 12:26 PM)  Get the CB rotary pump and no more noise. Best $50 bucks i spent when i still had the carbed 2056 ... http://www.cbperformance.com/catalog.asp?ProductID=577 (IMG:style_emoticons/default/bye1.gif) Andy (IMG:style_emoticons/default/agree.gif) That looks very similar to the Pierburg setup I put on my car. Works like a champ. |
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| Zundfolge |
Apr 23 2009, 02:19 PM
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#7
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Senior Member Group: Members Posts: 847 Joined: 12-August 07 From: Colorado Springs Member No.: 7,994 Region Association: Rocky Mountains |
darn ... and only about $5 more than the pump I bought (I figured someone would post some whiz bang dead silent pump that costs somewhere around what the original Bosch FI pump cost (IMG:style_emoticons/default/tongue.gif) ).
I think what I'll do is put a couple more diffuser disks in the SuperTrapp and it won't matter (IMG:style_emoticons/default/biggrin.gif) |
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