Sound deadening fuel pump jacket - GT Project |
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Sound deadening fuel pump jacket - GT Project |
tailwind22 |
Jun 24 2021, 08:42 AM
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#1
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Member Group: Members Posts: 88 Joined: 7-November 17 From: Moses Lake, WA Member No.: 21,583 Region Association: Pacific Northwest |
My 914-6 GT tribute has a Holly fuel pump mounted on the rear firewall using rubber washers. Staying true to the GT theme I have no engine compartment backpad and want to keep it that way. The fuel pump is noisy in the cockpit and I am looking to try to quiet things down. Anyone wrapped some sort of an insulating jacket around their pump? Looking for ideas.
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tygaboy |
Jun 24 2021, 09:12 AM
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#2
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914 Guru Group: Members Posts: 5,292 Joined: 6-October 15 From: Petaluma, CA Member No.: 19,241 Region Association: Northern California |
I'm betting you know this but will hazard the comment:
Be careful "insulating" the pump. Anything that retains heat in the pump isn't your friend. Could you move it off the firewall and still keep it true to the look? Is it purely the sound or is any vibration adding to the situation? If there is some vibration that's adding to the problem, maybe "double rubber mount it"? Something like a bracket that attaches to the current rubber mounts, then attach the pump to that with another set of rubber mounts? |
mepstein |
Jun 24 2021, 09:17 AM
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#3
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914-6 GT in waiting Group: Members Posts: 19,272 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region |
Get a quiet pump, plumb it into the fuel system in a hidden spot, gut the existing pump.
Quiet and looks correct. |
Retroracer |
Jun 24 2021, 09:33 AM
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#4
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Senior Member Group: Members Posts: 612 Joined: 7-July 13 From: Bend OR Member No.: 16,100 Region Association: Pacific Northwest |
Maybe more work than you're looking for, but on my faux GT I located the fuel pump in the front trunk (as per the factory GTs), fuel regulator in the lower engine bay. I have a Facet pump - which is quite noisy - but can only just hear it before the starter engages.
With your pump mounted on the firewall, it's going to work against that whole panel to try and make it a loudspeaker, coupled into the passenger compartment - suggest at least moving it to the edge of the firewall or attached to a stiffer surface - rubber mounted of course. - Tony |
Shivers |
Jun 24 2021, 09:38 AM
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#5
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Senior Member Group: Members Posts: 2,378 Joined: 19-October 20 From: La Quinta, CA Member No.: 24,781 Region Association: Southern California |
Ok, it's a tribute car with a Holley fuel pump. So looking correct at the fuel pump is not a concern. Here is the quiet holley:
https://www.amazon.com/Holley-12-427-Mighty...;language=en_US |
tailwind22 |
Jun 24 2021, 03:22 PM
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#6
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Member Group: Members Posts: 88 Joined: 7-November 17 From: Moses Lake, WA Member No.: 21,583 Region Association: Pacific Northwest |
Good thoughts. Just for shits and giggles here is a pic of the current install. Should have done a front trunk install or maybe look for a quieter pump.
Attached thumbnail(s) |
mlindner |
Jun 24 2021, 04:00 PM
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#7
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Senior Member Group: Members Posts: 1,521 Joined: 11-November 11 From: Merrimac, WI Member No.: 13,770 Region Association: Upper MidWest |
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brant |
Jun 24 2021, 04:22 PM
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#8
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914 Wizard Group: Members Posts: 11,624 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains |
The engine bay is not ideal
There is a reason the factory moved the pumps from the engine bay to the front trunk. And that was at 30 psi Gas boils easier at 3 psi You created a potential vapor lock problem in the heat |
brant |
Jun 24 2021, 04:43 PM
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#9
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914 Wizard Group: Members Posts: 11,624 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains |
Ideally. You are really supposed to use a return line
Cooler fuel. More hp All cars use return lines for a reason Here is my fuel system Attached image(s) |
bbrock |
Jun 25 2021, 08:09 AM
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#10
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains |
I would start by getting actual vibration isolating mounts rather than just rubber washers. They are available in many sizes and styles. Check McMaster-Carr. Those mounts completely isolate the part from the mounting surface with a rubber cushion with no metal fasteners running all the way through to telegraph vibrations. They can significantly reduce vibration noise in situations like this.
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Johny Blackstain |
Jun 25 2021, 08:30 AM
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#11
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Walnut Elite Stratocaster player Group: Members Posts: 3,434 Joined: 5-December 06 From: The Shenandoah River Member No.: 7,318 Region Association: MidAtlantic Region |
It's a frikkin noisy pump. I use it on my truck and it's mounted everywhere with rubber- the ring around the pump is rubber lined, the ring is rubber mounted to the bracket and it's rubber mounted to the frame (IMG:style_emoticons/default/dry.gif)
Attached thumbnail(s) |
Krieger |
Jun 25 2021, 08:38 AM
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#12
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Advanced Member Group: Members Posts: 4,711 Joined: 24-May 04 From: Santa Rosa CA Member No.: 2,104 Region Association: None |
I have the same pump. Mine is mounted in the front trunk. It is loud, but I can only hear it when the engine is not running.
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tailwind22 |
Jun 25 2021, 05:08 PM
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#13
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Member Group: Members Posts: 88 Joined: 7-November 17 From: Moses Lake, WA Member No.: 21,583 Region Association: Pacific Northwest |
Lots of good ideas. Good to know the Holly is a noisy pump. Thanks. Will try the vibration isolating mounts first and if that doesn't help will add another winter project to my list in moving to the front trunk. Thanks.
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