Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

2 Pages V < 1 2  
 Reply to this topicStart new topic
> Fuel pump relocation wiring question, the wiring is done I have a new question!
SLITS
post Oct 27 2012, 07:28 AM
Post #21


"This Utah shit is HARSH!"
**********

Group: Benefactors
Posts: 13,602
Joined: 22-February 04
From: SoCal Mountains ...
Member No.: 1,696
Region Association: None
QUOTE(gothspeed @ Oct 24 2012, 09:19 AM) *

Scott, thanks for following up on your progress! I have finally mounted my fuel pump under the steering rack. So far I think I will be running 12v power to the pump from the battery using a relay. The relay will in turn be triggered by the factory harness wires for the orignal fuel pump.

Since I am going with carbs for now, I will be going with the extra ground from the relay panel in the engine compartment.

Did you run fuel pump power with the 'key only' or did you also include an oil pressure switch to control power to the pump? If you included an oil switch in the circuit, how was it done?

I am under the impression the the swtich is open under pressure, which is the opposite of what one would need to complete the circuit.


It's been a long time, but the switch has contacts for NO and NC. The NC powers the pump while turning the starter. Once the engine fires and you have oil pressure, the NC opens and the NO closes to provide continuous power to the pump.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Dave_Darling
post Oct 27 2012, 11:35 PM
Post #22


914 Idiot
**********

Group: Members
Posts: 14,991
Joined: 9-January 03
From: Silicon Valley / Kailua-Kona
Member No.: 121
Region Association: Northern California
QUOTE(Nozzle @ Oct 20 2012, 06:00 AM) *

Why not just run both ground and positive leads from the engine compartment to the steering rack area?


That also works. A ground is a ground, so you can run a new ground wire from the old one, or you can just run a wire to any convenient ground. And the chassis itself is a ground, so that can be just about anywhere.

--DD
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
gothspeed
post Oct 28 2012, 02:36 PM
Post #23


Senior Member
***

Group: Members
Posts: 1,539
Joined: 3-February 09
From: SoCal
Member No.: 10,019
Region Association: None
QUOTE(SLITS @ Oct 27 2012, 05:28 AM) *

It's been a long time, but the switch has contacts for NO and NC. The NC powers the pump while turning the starter. Once the engine fires and you have oil pressure, the NC opens and the NO closes to provide continuous power to the pump.
That is awesome ....... I was wondering about power to the pump while the engine was turning .......... I thought if one used the oil pressure only, one might be cranking for a while until oil pressure built up ........... so power to the pump while cranking makes perfect sense ....... (IMG:style_emoticons/default/smile.gif)

Just to be clear ........... we are talking about the ignition switch that has the NC and NO options correct?

QUOTE(scott_in_nh @ Oct 27 2012, 05:18 AM) *

I am running D-jet so I am wired to the fuel pump terminal on the relay board.

OK thanks! I was working on the fuel lines this morning ..... (IMG:style_emoticons/default/smile.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
scott_in_nh
post Oct 29 2012, 12:09 PM
Post #24


Senior Member
***

Group: Members
Posts: 808
Joined: 10-December 10
From: Hampton, NH
Member No.: 12,471
Region Association: North East States
So it is on the ground and running again. (IMG:style_emoticons/default/biggrin.gif)
I only had time to take it to the gas sation and back before having to start preparing for the storm.

The shifter still needs a slight adjustment, but I think it is already better then it was.
The console still has to go in once the shifter is done.

The limited cornering I've had indicated a major change with the front bar in!
(IMG:style_emoticons/default/driving.gif)

I don't usually lose parts, but I've misplaced the "buckle" end of one of the gas tank straps, and the car already was missing the strap for the carbon cannister.

If anybody has those parts let me know.
I'll be posting a WTB.

Scott
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
gothspeed
post Oct 29 2012, 08:33 PM
Post #25


Senior Member
***

Group: Members
Posts: 1,539
Joined: 3-February 09
From: SoCal
Member No.: 10,019
Region Association: None
Drilled some holes and put some grommets in them. Getting ready to route wires, what gauge wire did you use or recommend? I was thinking 16g wire for my cb performance 3.5psi pump. Even though i am using a relay next to the battery, the pump is way up front next to the steering rack. Does anyone see a problem with 16g? Should i go with bigger wire? (IMG:style_emoticons/default/unsure.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
SLITS
post Oct 30 2012, 06:49 AM
Post #26


"This Utah shit is HARSH!"
**********

Group: Benefactors
Posts: 13,602
Joined: 22-February 04
From: SoCal Mountains ...
Member No.: 1,696
Region Association: None
QUOTE(gothspeed @ Oct 28 2012, 01:36 PM) *

Just to be clear ........... we are talking about the ignition switch that has the NC and NO options correct?


I was describing an aftermarket fuel cutoff switch.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
gothspeed
post Oct 30 2012, 07:45 AM
Post #27


Senior Member
***

Group: Members
Posts: 1,539
Joined: 3-February 09
From: SoCal
Member No.: 10,019
Region Association: None
QUOTE(SLITS @ Oct 30 2012, 04:49 AM) *

I was describing an aftermarket fuel cutoff switch.
ok that makes sense now ... (IMG:style_emoticons/default/smile.gif)
What wire gauge do you recommend for a front mounted carter/CB performance 3.5 PSI fuel pump which is powered from the stock battery location?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
SLITS
post Oct 30 2012, 10:46 AM
Post #28


"This Utah shit is HARSH!"
**********

Group: Benefactors
Posts: 13,602
Joined: 22-February 04
From: SoCal Mountains ...
Member No.: 1,696
Region Association: None
14 or 16 .....
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
gothspeed
post Oct 30 2012, 11:36 AM
Post #29


Senior Member
***

Group: Members
Posts: 1,539
Joined: 3-February 09
From: SoCal
Member No.: 10,019
Region Association: None
QUOTE(SLITS @ Oct 30 2012, 09:46 AM) *

14 or 16 .....
Thanks for the response man ..... that sounds good .... (IMG:style_emoticons/default/smile.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
76-914
post Oct 30 2012, 11:54 AM
Post #30


Repeat Offender & Resident Subaru Antagonist
**********

Group: Members
Posts: 13,513
Joined: 23-January 09
From: Temecula, CA
Member No.: 9,964
Region Association: Southern California
Your fuse needs to match the wire size. The wire size could be anything from 2 ga to 18 ga but if your fuse size doesn't match or is too large then the wire becomes your fuse.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
gothspeed
post Oct 30 2012, 12:24 PM
Post #31


Senior Member
***

Group: Members
Posts: 1,539
Joined: 3-February 09
From: SoCal
Member No.: 10,019
Region Association: None
QUOTE(76-914 @ Oct 30 2012, 10:54 AM) *

Your fuse needs to match the wire size. The wire size could be anything from 2 ga to 18 ga but if your fuse size doesn't match or is too large then the wire becomes your fuse.
Yes, (IMG:style_emoticons/default/smile.gif) ........ here is a chart link for wire gauge to length (below) ......... so installing a fuse a few amps below the ampacity of the wire would work ......... but I am also trying to find out the amp draw of the pump ...... so if possible, I can add an even smaller fuse to further protect the wire circuit.

http://www.tessco.com/yts/industry/product.../get_wired.html

Edit: Looks like the Carter/CB Performance 3.5 PSI fuel pump instructions call for a 3 amp fuse and 16 gauge wire. I will run a 14 gauge wire as Slits suggested, so in the future when I go fuel injection (more powerful pump) ...... I should not need to run another wire, only up rate the fuse ....... (IMG:style_emoticons/default/smile.gif)

Thanks to all who have posted info!! (IMG:style_emoticons/default/smile.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

2 Pages V < 1 2
Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 16th June 2024 - 11:42 PM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...