I'm running twin external pumps. (Walbro 225 feeding bosch 044)
The stock fuel pump wiring doesn't look too impressive.

I'm going to be hard wiring the pumps with a direct feed from the battery, but don't want to use a relay. I'm just going to have a large switch.

Do I need a relay if I'm going to hard wire them?

Any info/advice would be appreciated.

Thanks.

 

Ok, so the admins decided to move this thread from the "electrical queries" section to the tech/misc section.
I'm confused.

 

dont just run them off a switch. it's 2012.

http://www.r1200gs.info/howto/images/Schematic4.gif

 

What are the negatives of just running a switch?

 

The negatives would be that if it shorts out you get a fire

 

The way I see it, the relay just allows a high voltage circuit to be turned on by a low voltage circuit. I'm not using oe wiring, and I don't mind switching the pumps on every time I get in the car. Is there not just as much chance of it shorting out using a relay as using a switch?

 

I like to see your car spray fuel all over the place and burst into a mad raging flame as you forget to shut off the switch and leave it running while your parked and sleeping. Every car has a relay and its for that exact purpose, because people are idiots who forget.

 

A bit harsh!


Good point!

Thanks for the input

 

You'll only be using the OEM wire to trigger the relay.