Fuse Size Question
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Cargo Master
Joined: Feb 2010
Posts: 2,526
Likes: 6
From: College Station, TX
Fuse Size Question
I'm just wondering what the amperage is on a stock SD fuel pump or what size fuse I need to have it on. I'm running power from an added maxi fuse and need to know what size to use. Power is going from the battery --> fuse --> relay --> pump. Also there will be an OPS wired to the relay, starter solenoid, and fuel bowl heater wire if that makes any difference.
Lead Driver
Joined: Oct 2010
Posts: 5,127
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From: Columbus, Oh
Not sure about the exact amps Jacob, but Bill had me buy a 60 amp maxi for my e fuel. I'm sure he can chime in or I might have the part numbers out in the shop of the fuse/fuse housing and pigtail if you need it.
Elder User
Joined: Aug 2009
Posts: 869
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From: Michigan
Fuses are sized according to the size of the wire feeding the circuit. its meant to pop first before the wire burns. wire (and relays) is sized according to the current of the device its powering. so size the wire correctly first. its an electric motor so its going to be hefty sized wire. im thinking 12awg minimum. what size is the wire thats coming out of the motor?
Hotshot
Joined: Jan 2012
Posts: 11,132
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From: Southern West Virginia
I used a 20 amp in line fuse to feed power to the relay>pump. If you are using the fuel bowl heater wire for the key on power to the coil side of the relay, it's already fused. The relay I used was a 60 amp relay.
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Cargo Master
Joined: Feb 2010
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From: College Station, TX
It's a factory relay just like the rest of them in the power distribution box. I'm not sure what size wire it is but 12 awg stands out in my memory. I guess the fuel bowl heater wire powers the key on coil through the OPS. So do I not need a fuse between the battery and relay on the 12v constant or between the relay and pump?
Also I need to find out what functions each leg of the relay provide. They are numbered and I know that tells you what is what, I just don't know waht each number means.
Also I need to find out what functions each leg of the relay provide. They are numbered and I know that tells you what is what, I just don't know waht each number means.
Hotshot
Joined: Jan 2012
Posts: 11,132
Likes: 3
From: Southern West Virginia
I fused mine between the battery and relay. Look on the side of the relay and it should have a diagram of what terminals are what. I think 85 is coil positive, 86 is coil neg., 30 is 12v in and 87 or 87a, one or the other is normally open.
Lead Driver
Joined: Oct 2010
Posts: 5,127
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From: Columbus, Oh
I knew you'd set me straight on that...
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Cargo Master
Joined: Feb 2010
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From: College Station, TX
Post Fiend
Joined: Dec 2010
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From: Orrville, Ohio
The fuse in Todd's truck is a 20A as well. It was that or a 10A since those were the only two I had on hand at the time we wired up his E-Fuel. In fact his is a glass fuse... Gotta use what you have available. It wouldn't have been my first choice, but it works.
Hotshot
Joined: Jan 2012
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From: Southern West Virginia
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Lead Driver
Joined: Oct 2010
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From: Columbus, Oh
