VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

  #1  
Old 01-23-2017, 06:56 PM
Jim garrett Jim garrett is offline
 
Join Date: Apr 2015
Location: Friendswood, texas
Posts: 10
Default On/ off switch for elec. fuel pump

I need some help on installing a switch to turn off the elec. fuel pump .

I want to install the switch on the instrument panel. To interrupt the positive wire with the switch, which wire number do I interrupt coming from the switch/ fuse panel?

I have been told it is number 1 wire. Don't know if that is correct and if it is, where do you read the number ( i.e. What part of the cannon plug - front or back do you read the number from?
Reply With Quote
  #2  
Old 01-23-2017, 08:34 PM
Mich48041 Mich48041 is offline
 
Join Date: Apr 2008
Location: Riley TWP MI
Posts: 3,070
Default Fuel Pump Switch

Do NOT switch power coming from pin 1 of the switch module because that will shut off the avionics cooling fans. The avionics could overheat. Instead, insert the switch in the wire that is connected to pin 29 of the fuselage D-Sub connector. That wire should be 18 AWG with RED insulation. It should be easy to find because it is the only 18 AWG wire. All of the rest on the fuselage connector are 22 AWG.
I have a fuel pump switch for ground operations. I never shut the electric pump off while flying.
__________________
Joe Gores
RV-12 Flying
Reply With Quote
  #3  
Old 01-23-2017, 09:25 PM
DaleB's Avatar
DaleB DaleB is offline
 
Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 2,247
Default

The builder of my 12 put a Klixon breaker next to the fuel valve. That seems a lot easier than putting it in the panel. I use it instead of pulling the fuse on the ground (avionics work, etc) but like Joe never use it in flight.
__________________
Dale

Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
Reply With Quote
  #4  
Old 01-23-2017, 09:27 PM
John-G John-G is offline
 
Join Date: Jan 2012
Location: Northeast Ohio
Posts: 685
Default

Jim -

Follow Joe's advise.

Also, if you want the fuel pump switch to match the rest of the switches installed on the RV-12 you can order an Otto K1ABAPCABA switch.
__________________
John
www.dogaviation.com
RV-12 Wings, Empennage, Fuselage, Finishing, Avionics and Powerplant kits all completed
Now Flying!!

Donation paid until September 2021
Reply With Quote
  #5  
Old 01-24-2017, 10:30 AM
MacPara's Avatar
MacPara MacPara is offline
 
Join Date: Apr 2010
Location: Tucson, AZ
Posts: 461
Default

Quote:
Originally Posted by Jim garrett View Post
I need some help on installing a switch to turn off the elec. fuel pump .

I want to install the switch on the instrument panel. To interrupt the positive wire with the switch, which wire number do I interrupt coming from the switch/ fuse panel?

I have been told it is number 1 wire. Don't know if that is correct and if it is, where do you read the number ( i.e. What part of the cannon plug - front or back do you read the number from?
In this rare case I did not locate the wire by pin number on a plug but by tracing it in the tunnel. It was pretty simple with mine as it was a distinctive, stiff red wire, thicker than all the others and, well, RED. Here's the write-up: Fuel Pump Wiring
My switch is on the panel, where others have their AP disconnect button. I used a DPST switch to run the other wire to the EMS and let SkyView know in which position the switch is so I can show the on/off status on the engine display.
__________________
RV-12: #120374, ELSA, N128TL flying since Nov 28, 2013 (Phase 1 completed 1/26/14)
SkyView, Light Package, ADSB
http://torstensrv-12.blogspot.com/
APRS Track

Last edited by MacPara : 01-24-2017 at 01:05 PM.
Reply With Quote
  #6  
Old 01-24-2017, 02:02 PM
John-G John-G is offline
 
Join Date: Jan 2012
Location: Northeast Ohio
Posts: 685
Default

As another data point for the switch location ... I located my fuel pump switch along with a switch for my left landing light above the AV-50002 Ignition & Start module aligned with the ignition switches.

I wanted two landing lights for wig-wag operation and added the switch to limit the steady on current draw ... the left light can be turned on during short final and off after landing.
__________________
John
www.dogaviation.com
RV-12 Wings, Empennage, Fuselage, Finishing, Avionics and Powerplant kits all completed
Now Flying!!

Donation paid until September 2021
Reply With Quote
  #7  
Old 01-24-2017, 07:11 PM
RFSchaller RFSchaller is offline
 
Join Date: Oct 2010
Location: Phoenix, AZ
Posts: 2,820
Default

I don't have lights, so I just wired the fuel pump into that switch. It's easily done in the wire bundle just aft of the footwell angled partition and under the centerline floor panel.
Reply With Quote
  #8  
Old 01-24-2017, 08:58 PM
MartySantic's Avatar
MartySantic MartySantic is offline
 
Join Date: Apr 2008
Location: Davenport, IA
Posts: 1,390
Default

Quote:
Originally Posted by RFSchaller View Post
I don't have lights, so I just wired the fuel pump into that switch. It's easily done in the wire bundle just aft of the footwell angled partition and under the centerline floor panel.
Are the AWG wire sizes and circuit board traces current capabilty sufficient? If so, sounds like a nice solution.
__________________
Marty Santic ----- W9EAA
RV-12 N128MS ----- Now Flying
My RV-12 Build Log - http://www.martysrv12.blogspot.com/
Davenport, IA
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 06:53 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.