Recommended wiring for electric fuel pump

[rmaynard 17,142]

This will be my first venture into the world of electric fuel pumps. I just received my Facet pump and want to wire it into my 1996 416-H (Onan). For those of you who have done this on similar engines, where are you tapping into for 12 volts? 

[ebinmaine 78,587]

@Bill D I believe it was. Recommended tapping on to the positive side of the coil feed. That way the fuel pump is connected to any safety switches that may be in play also, it gets power during the starting and running phases of the ignition switch.

 

 

[Bill D 2,817]

1 hour ago, ebinmaine said:

@Bill D I believe it was. Recommended tapping on to the positive side of the coil feed. That way the fuel pump is connected to any safety switches that may be in play also, it gets power during the starting and running phases of the ignition switch.

 

 

Exactly.  Couldn't have said it better myself. 

[ebinmaine 78,587]

20 minutes ago, Bill D said:

Exactly.  Couldn't have said it better myself. 

 

You did.  

 

[ri702bill 12,039]

22 minutes ago, Bill D said:

Recommended tapping on to the positive side of the coil feed.

But... do add in inline fuse between the coil feed and the pump.

[rmaynard 17,142]

1 hour ago, Bill D said:

Exactly.  Couldn't have said it better myself. 

Thanks. That's what I needed.

[Stan50 157]

Is this correct? What fuse is needed? 15A? 30A?

[pfrederi 20,437]

The Facet pumps have an internal circuit breaker

 

None of the pumps draw more than 4-5 amps most less.  Fuse size should be based on wire gauge.  If you use 16ga i would use 10 amp fuse 

 

make your connection to the "+" terminal on the coil

Edited January 12 by pfrederi

[WHX?? 56,433]

I wired one to the pink dash lights wire on a 520 so it would be fused by that circuit. Problem is as the pump pulses the (led) lights flicker in tune with the pump. I may move it to the coil but I may have a battery going south too as it kinda goes away at throttle up. 

[Stan50 157]

1. Ok guys, so correct diagram would be like this?

2. I noticed that many of you placed electric fuel pumps near carburator in the front,but others recommend placing pump just under the fuel tank,where electric pump has short suction line.

 

3. I've got w carBole fuel pumps, one (on the right) off of Ama...com, and other ("squarish" one) from Chinese website ( official CarBole store). Both almost identical, except main body shape. Very interesting  

 

 

[pfrederi 20,437]

Wiring is correct.  For under seat gas tanks I always mount the pump low and near the tank..  If yo are putting the pump on a WH with gas tank under the hood mount where ever you can.  Gravity will fill the pump most the time.

[Stan50 157]

@pfrederi separate ground wire will be necessary from coil? I mean that there is already ground wire ,goes from coil tru condenser? Sorry but my electrical knowledge isn't so great

[953 nut 65,722]

1 hour ago, Stan50 said:

@pfrederi separate ground wire will be necessary from coil? I mean that there is already ground wire ,goes from coil tru condenser? Sorry but my electrical knowledge isn't so great

You are over thinking this situation. The condenser is on the negative side of the coil and has nothing to do with power to the fuel pump. You are just using the positive side wire at the coil as a convenient source of power that will be turned on and off with the keyswitch.

[sqrlgtr 2,782]

On 1/7/2026 at 10:29 AM, rmaynard said:

This will be my first venture into the world of electric fuel pumps. I just received my Facet pump and want to wire it into my 1996 416-H (Onan). For those of you who have done this on similar engines, where are you tapping into for 12 volts? 

@rmaynard just installed Facet fuel pump on my 520H and I tapped into the hot side of coil (redwire on pump) and just grounded (black wire on pump) under pump mounting bolt and it worked great. Key on pump runs key off pumps is off. also put a 10amp fuse in red wire going to pump from coil...

Edited 4 hours ago by sqrlgtr