 What is this hole for? |
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| sdthomas |
 Dec 28 2013, 07:57 PM
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#1
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Member  Group: Members Posts: 64 Joined: 14-June 11 From: Seattle Member No.: 13,193 Region Association: Pacific Northwest 
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I'm thinking about mounting my fuel pump on the firewall since my stock pump failed and one of the bolts holding it in place rusted away (IMG:style_emoticons/default/dry.gif) . So I pulled out the seats and backpad to find a good place to drill a hole for the pump bracket mounting bolts and noticed that there are two small holes already in the firewall and the surrounding sound-deadening material. They don't seem to go through to the other side but are clearly there for a reason. Any idea what they are for? The car is a 74.
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| porschefile2010 |
Dec 28 2013, 08:17 PM
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#2
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Member Group: Members Posts: 228 Joined: 26-May 11 From: Whangaparaoa, New Zealand Member No.: 13,118 Region Association: Australia and New Zealand |
From memory I think there was a bolt went through there to hold the soundproofing in place on both sides of the firewall. I ditched mine on the engine side and replaced it with more modern sound deadening. We'll see if I'm right shortly??
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| JawjaPorsche |
Dec 28 2013, 09:19 PM
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#3
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Advanced Member Group: Members Posts: 3,463 Joined: 23-July 11 From: Clayton, Georgia Member No.: 13,351 Region Association: South East States |
Here is my fuel pump mounted on firewall. Used long bolts from behind back pad with large fender washers.
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| anderssj |
Dec 28 2013, 09:19 PM
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#4
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Dog is my copilot... Group: Members Posts: 1,664 Joined: 28-January 03 From: VA Member No.: 207 Region Association: MidAtlantic Region
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IIRC there are 4 phillips head screws near the bottom of the back pad (2 behind each seat). Could those be the holes for the screws?
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| sdthomas |
Dec 28 2013, 10:24 PM
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#5
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Member Group: Members Posts: 64 Joined: 14-June 11 From: Seattle Member No.: 13,193 Region Association: Pacific Northwest
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No these holes are different from the four backpad screws. It makes sense that they would be for screws that hold up the sound deadener though. Maybe I should add some?
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| sdthomas |
Dec 28 2013, 10:27 PM
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#6
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Member Group: Members Posts: 64 Joined: 14-June 11 From: Seattle Member No.: 13,193 Region Association: Pacific Northwest
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JawjaPorsche, you don't happen to remember to remember the length of the bolts you used? It would be great to know that ahead of time, with fuel likely dripping out.
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| Cap'n Krusty |
Dec 28 2013, 11:00 PM
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#7
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
Holes in the firewall higher than about 4-6" from the bottom should be ignored, as the pump needs to be mounted low on the chassis.
The Cap'n |
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| JawjaPorsche |
Dec 29 2013, 07:55 AM
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#8
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Advanced Member Group: Members Posts: 3,463 Joined: 23-July 11 From: Clayton, Georgia Member No.: 13,351 Region Association: South East States |
QUOTE(sdthomas @ Dec 28 2013, 11:27 PM)  JawjaPorsche, you don't happen to remember to remember the length of the bolts you used? It would be great to know that ahead of time, with fuel likely dripping out. I can't remember what I had for breakfast! Seriously, I think they are six inches but not sure. Did this 20 years ago! You can always get a little longer and cut them if too long. I used an extra coil bracket I had for the fuel pump holder. Used rubber between bracket and pump to silence pump vibration noise. |
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