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> 73 fuel pump mounting question, It has been too long !!!!!!!
David_S
post Jan 20 2008, 01:05 AM
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I started tinkering with my project again a few days ago, and am in the process of getting the engine bay back together. Only problem so far is I had to replace the right engine shelf, and I cant remember how the fuel pump mounts ! I attached a pic of the area where the Haynes manual shows it to be, but the pic in the manual isn't the greatest. Also in the pic, what mounts in the slotted J shaped bracked above the motor mount? It has been too long ago since I tore this thing apart and I screwed up and didn't take enough pictures !!!!!! TIA


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cwpeden
post Jan 20 2008, 02:33 AM
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I replaced mine and didnt know either, this is what I ened up with

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cwpeden
post Jan 20 2008, 02:36 AM
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close up


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swl
post Jan 20 2008, 07:51 AM
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Here is the 'as installed' position. The pump mounts by way of 2 rubber bushings - noise and vibration isolation. You can just see one at the top of the pump.

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SirAndy
post Jan 20 2008, 11:48 AM
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QUOTE(swl @ Jan 20 2008, 05:51 AM) *

Here is the 'as installed' position. The pump mounts by way of 2 rubber bushings - noise and vibration isolation. You can just see one at the top of the pump.

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Cevan
post Jan 20 2008, 06:29 PM
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Why not relocate the pump to the front?
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ClayPerrine
post Jan 20 2008, 09:24 PM
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QUOTE(Cevan @ Jan 20 2008, 06:29 PM) *

Why not relocate the pump to the front?

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You are better off relocating the pump up front. That way you don't get the vapor lock problem. It will vapor lock, because the hot air dump from the heat exchangers points right at it.
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David_S
post Jan 20 2008, 11:12 PM
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QUOTE(ClayPerrine @ Jan 20 2008, 09:24 PM) *

QUOTE(Cevan @ Jan 20 2008, 06:29 PM) *

Why not relocate the pump to the front?

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You are better off relocating the pump up front. That way you don't get the vapor lock problem. It will vapor lock, because the hot air dump from the heat exchangers points right at it.


Havent really thought about it that much ......until now. The heat from the heat exchanger really could affect the pump and vapor lock. I guess now would be the time to do it if I was going to do it !!! Now .....where would it mount to in the front trunk ???
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SirAndy
post Jan 21 2008, 10:37 AM
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QUOTE(ClayPerrine @ Jan 20 2008, 07:24 PM) *

QUOTE(Cevan @ Jan 20 2008, 06:29 PM) *

Why not relocate the pump to the front?

(IMG:style_emoticons/default/agree.gif)


You are better off relocating the pump up front. That way you don't get the vapor lock problem. It will vapor lock, because the hot air dump from the heat exchangers points right at it.


huh? (IMG:style_emoticons/default/confused24.gif)

i ran my '70 1.7L for 6 years with the pump in the stock location. never had a single problem with vapor lock. not even on the 110 deg. central valley drives ...
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Phoenix914
post Jan 21 2008, 12:02 PM
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I just replaced the mounts on my '73 because one of them was broken. The mounts stick through the firewall from underneath into the very bottom of the hellhole. It's probably much easier to do it with the engine out! I was practically standing on my head trying to reach down there. It did give me an opportunity to clean out all the gunk that had accumulated, including the mouse carcass. (IMG:style_emoticons/default/barf.gif)

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ConeDodger
post Jan 21 2008, 12:53 PM
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In a properly maintained car you should not experience vapor lock. I suspect that Porsche relocated the fuel pump because they couldn't count on people properly maintaining their cars. In the back it is close to a source of heat and possible ignition for those cars that owners maintain poorly.

At the pressure in an EFI system vapor lock shouldn't occur with a properly maintained vehicle. It is easy enough to relocate if you have the proper mount but a pain to replace it and the fuel filter.

That said, mine is up front. But it came that way...
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SirAndy
post Jan 21 2008, 12:59 PM
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QUOTE(ConeDodger @ Jan 21 2008, 10:53 AM) *

At the pressure in an EFI system vapor lock shouldn't occur with a properly maintained vehicle.


vapor lock happens on the supply side of the pump. they're notoriously bad at pumping vapors ...
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swl
post Jan 22 2008, 11:42 AM
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I suspect that the original engineers located the pump close to the engine to minimize the amount of the fuel system that was under pressure. IMHO if you relocate to the front you MUST get rid of the original delivery line and replace it with a hardline.
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David_S
post Jan 27 2008, 11:14 AM
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So ....going by the pic that SWL posted .....the fuel pump mounts to the frame rail ?? I looked at a 72 here in town and it appears to mount to the engine tin. My 73 tin does not have holes in the tin in the same place as the 72.
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swl
post Jan 27 2008, 11:29 AM
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definitely not the engine tin. it stays with the car when you drop the engine. There were (I think) only two mounting locations. Originally they were mounted in the rear according to the picture. Then (75?) they moved it to the front and switched to a 2 port. 72 and 73 left the factory with exactly the same mount and plumbing. My pic is of an unmolested 73.

I'm looking at your pic trying to figure out the two holes that are there and can't visualize how they would be used in mounting the fuel pump. There should be two identical holes, one over top the other. Spacing, of course, is the same as the mounting ears on the pump. Fore and aft locations is with the end of the pump almost up to the firewall.
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David_S
post Jan 27 2008, 11:39 AM
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SWL ......The small hole in my pic is about 1/4" diameter. It is where the clamp is on the brake line in your pic. The other hole in my pic, the one in the corner, is about 1/2" diameter. I assumed it was for a wiring harness grommet. No holes anywhere else, which is why I think I may have welded them up in my repair. From what I can see of your pic, your pump is attached to the frame rail.
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swl
post Jan 27 2008, 11:46 AM
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My pump is not installed at the moment - would you like me to get a pick of the mount location without the pump in place? It's not too cold out in the garage today. I might even be able to get you a rough distance forward from the firewall and down from the lip.
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swl
post Jan 27 2008, 11:50 AM
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hmm. on your pic there are a couple of light spots that are pretty close to where I would guess the mounting points to be. Maybe those are remnants of your welding repairs. I don't think you need to be super accurate with the mounting location - just keep it clear of the firewall and as high as possible and you should be good to go. Do you still have the rubber grommets?
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David_S
post Jan 27 2008, 11:56 AM
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A pic would be wonderful!!!! I did notice the "spots" you are trferring to, and wondered if that is where it went. I don't have the rubber mounts yet, but they are on an order that I am fixing to place.
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swl
post Jan 27 2008, 12:20 PM
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just had a quicklook. I tried to grab a pic but I was shooting in the dark and they are pretty shitty. I'll have to try again after I break out the trouble light (I'm in hibernation mode up here in the cold cruel north). Looks like Pelican will send you the rubber mounts.
http://www.pelicanparts.com/catalog/shopca..._pg3.htm#item11
901-501-864-00-OEM
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