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82cabby
Samba Member
Joined: March 07, 2005
Posts: 333
Location: West Falls, NY
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 Posted: Fri Aug 21, 2009 10:59 am Post subject: wiring rabbit fuel relay - which way is right? |
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Hi all -
Just a quick question. I am wiring up an electric fuel pump in my 71 Super and am going to use the rabbit fuel pump relay. I have found lots of info on connecting it but two of the diagrams conflict.
This one shows terminal 30 going to the positive battery terminal and 87 going to the positive terminal on the fuel pump:
While the information on the page below has those two reversed (ie 87 to the battery and 30 going to the fuel pump)
http://www.ratwell.com/mirror/sfraser/relay.html
It may not make any difference, but I don't want to blow this relay up, it was pricey.
Thanks! |
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akokarski
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Joined: May 24, 2004
Posts: 2098
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| Posted: Fri Aug 21, 2009 11:09 am Post subject: |
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It won't matter. 30/87 is just a switch power from these leads does not affect any other circuit in the relay.
Anton |
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82cabby
Samba Member
Joined: March 07, 2005
Posts: 333
Location: West Falls, NY
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| Posted: Fri Aug 21, 2009 11:11 am Post subject: |
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| Cool! Thanks man. |
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CLKWRK
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Joined: October 02, 2001
Posts: 566
Location: Toronto
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Dale M.
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Joined: April 12, 2006
Posts: 20794
Location: Just a tiny bit west of Yosemite Valley
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| Posted: Fri Aug 21, 2009 9:38 pm Post subject: |
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According to DIN standards (European) 30 always goes to the SOURCE of power (12 volts- battery).....
http://www.e38.org/understanding%20euro%20wiring%20diagrams.pdf
Dale
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akokarski
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Joined: May 24, 2004
Posts: 2098
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| Posted: Fri Aug 21, 2009 11:22 pm Post subject: |
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| Well that's pretty cool and makes sense! I can see how that can be helpful when troubleshooting. Nice! |
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Dale M.
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Joined: April 12, 2006
Posts: 20794
Location: Just a tiny bit west of Yosemite Valley
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| Posted: Sat Aug 22, 2009 5:58 am Post subject: |
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More good tech information links such as DIN article can be found here....
http://www.mydune-buggy.com/techpage.html
Dale
_________________
“Fear The Government That Wants To Take Your Guns"
"Kellison Sand Piper Roadster" For Street & Show.
"Joe Pody Sandrover" Buggy with 2180 for Autocross (Sold)
============================================================
All suggestions and advice are purely my own opinion. You are free to ignore them if you wish ... |
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barfy
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Joined: August 16, 2009
Posts: 167
Location: somewhere
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| Posted: Sat Aug 22, 2009 9:17 am Post subject: |
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| why use the relay? I may be looking at getting a electric pump from aircooled.net. |
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Matthew
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Joined: January 29, 2004
Posts: 1760
Location: Eastern Tennessee
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| Posted: Sat Aug 22, 2009 10:24 am Post subject: |
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| barfy wrote: |
| why use the relay? I may be looking at getting a electric pump from aircooled.net. |
The way this relay is wired, the fuel pump will only run when the engine is turning. If the engine stops unexpectedly, the fuel pump will stop as well. This is a good safety feature in the event of an accident or engine/ electrical failure. Wiring a fuel pump so that it always runs when the key is on is asking for trouble IMHO.
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Dale M.
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Joined: April 12, 2006
Posts: 20794
Location: Just a tiny bit west of Yosemite Valley
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| Posted: Sat Aug 22, 2009 10:27 am Post subject: |
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Quite true that you can run most any fuel pump with out a relay....
This relay has unique feature... If wired correctly and if it does not receive pulse signal from dist (signify engine running) it shuts down...... Pretty good idea of you are upside down in car and engine stopped and you don't really want fuel gushing from carb onto hot exhaust or some such thing.....
If you choose to use a relay and even if its is not the ignition safety cutoff type, a relay will remove some of the high amperage load off IGN switch.... We tend to forget that a IGN switch as certain amperage limits and we all are probably guilty of over loading it and don't ever realize it....
Most all new cars use relays to energize fuel pumps, but then again fuel pump is usually under control of ECM...
Dale
_________________
“Fear The Government That Wants To Take Your Guns"
"Kellison Sand Piper Roadster" For Street & Show.
"Joe Pody Sandrover" Buggy with 2180 for Autocross (Sold)
============================================================
All suggestions and advice are purely my own opinion. You are free to ignore them if you wish ... |
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