I'm going to be running a remote battery setup.

I was planning on running a distribution block which requires fuses. I was wondering what fuse amperage I should use for the fuel pumps?

(From the dist. block, I was going to run Bosch relays. Meaning that the pumps will not be powered directly from the battery, but triggered from the ignition source.)

I was guessing from the relay, but would a 30 amp fuse suffice? Or should I get something bigger since the relay is in place?

 

This is already how the stock system works


So what exactly are you planning to power the stock fuel pump relay with an aftermarket relay?

 

Ahh sorry, the fuel system is going to be upgraded as well. Thinking about using a Walboro.

I have a hard time reading wiring schematics, haha...

The big point in this is so I can use a master battery kill switch to turn off all power from the battery and fuel pumps for track safety reasons. I've never done the wiring before, so please point out any faulty reasoning.

 

I have been using a Walbro for over a year on the stock fuel wiring, without any problems at all. It would be possible to completely bypass the stock fuel pump wiring and go directly from the battery to the pump through relays and switches and whatnot, but honestly I don't see the point, unless your going fully custom wiring, running dual pumps, etc. If you want to wire a kill switch you don't need to rewire everything especially if your moving the battery, simply wire a high current (IMHO >200Amp would be best) between the positive terminal and the fuse block.

 

I hear you, actually need a master kill switch to meet track regulations. I'm debating on running parallel lines on dual pumps. Is this logical?

Back to my original question, 30 amp fuse to the relay? Or higher? I neglected to notice that it was a fused distribution block, so I need a fuse to complete the circuit.

 

If you are determined to do this, I would go all the way and use dual relays, dual fuses and dual wiring to each fuel pump. This is in my opinion the Best, and only truly safe way to run dual pumps. Simply because with independent powering to each pump, even if one of the systems shorts out/relay fails/fuse blows, it will not compromise the other pump, and will keep at least some fuel flowing. This should provide some safety net and lessen the change that you blow your motor due to going lean extremely suddenly. In regards to the fuse, the stock system uses a 20A fuse, if you are concerned with resistance of the additional wires, I might go to a 25Ato each pump. I personally thing 30 is a bit much. The best way to be sure it to check the resistance of the system, and the requirements of the pump you are using, but thats going to the extreme.

 

Thank you very much!