electric fuel pump conversion question
Thread Starter
|
Senior User
Joined: Jan 2013
Posts: 303
Likes: 0
electric fuel pump conversion question
I've got my pump wired in with a oil pressure shut of switch and relay. My issue is with the "I" terminal on the switch says it needs to go to a ignition source so I wired it into my ignition modules red wire and the pump works fine and everything works fine but I have recently read that this may hurt the truck and that my ignition source should actually be wired into the ignition switch so now My question is where does my wire go on the ignition switch at?
Fleet Mechanic
Joined: Jun 2013
Posts: 1,895
Likes: 32
The only way I see this hurting your ignition system is by overloading it.. you should consider wiring in a 5 wire relay so the ignition voltage is used to switch the relay on so it flows a better more direct current from the battery.
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
Read this thread by fmc400, this is the way to hook up an electric fuel pump.
https://www.ford-trucks.com/forums/1...sion-pics.html
https://www.ford-trucks.com/forums/1...sion-pics.html
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
When you say the 'I' terminal of "the switch," does "the switch" refer to the Hobbs-style oil pressure cutoff switch? Did you use the same switch as me?
What specifically is your concern - overloading the wire? If the 'P' terminal of your Hobbs switch runs straight to the pump, then yes, you'll burn up the harness. If you instead run the 'P' terminal of the switch to the coil of a relay like I did (along the lines of Jdeshler's suggestion), then there's no concern because relay coils draw very little current. That's the whole point of a relay (use a low-current circuit to switch a high-current load).
What specifically is your concern - overloading the wire? If the 'P' terminal of your Hobbs switch runs straight to the pump, then yes, you'll burn up the harness. If you instead run the 'P' terminal of the switch to the coil of a relay like I did (along the lines of Jdeshler's suggestion), then there's no concern because relay coils draw very little current. That's the whole point of a relay (use a low-current circuit to switch a high-current load).
Thread
Thread Starter
Forum
Replies
Last Post
iwkr40
1987 - 1996 F150 & Larger F-Series Trucks
17
Oct 8, 2006 11:37 PM
nalts
1987 - 1996 F150 & Larger F-Series Trucks
5
Jun 9, 2003 10:38 PM
