Question about fusing the fuel pump at the pump.

[kristmen]

Recently put a Denso Supra Twin Turbo fuel pump in my winter car (1G) without rewiring the power to 14 volts (stock wiring).

I have a fuel pressure gauge located on top of my fuel filter, no AFPR. I'm seeing 40 pounds of fuel at idle which I can deal with. According to my pocket logger, my car isn't even rich at idle.

So anyway part of what prompted this was my fuel pump sending unit was jacked up. I had to cut the compression fitting off the line and install -an fittings etc.

I also had to install new power wires and grounds to the sending unit and in the process I installed a fuse about 6 inched off the pump.

What amp fuse should I be running with this? I don't want use too small of a fuse and have the thing pop on me and get stuck somewhere if I run out of fuses.

20 amps be enough?

 

[RoasT BeeF]

20 is fine but it should be located about a foot from the battery as opposed to the pump.

 

[DSM90AWD]

Recently put a Denso Supra Twin Turbo fuel pump in my winter car (1G) without rewiring the power to 14 volts (stock wiring)

I also had to install new power wires and grounds to the sending unit and in the process I installed a fuse about 6 inched off the pump.

What amp fuse should I be running with this? I don't want use too small of a fuse and have the thing pop on me and get stuck somewhere if I run out of fuses.

If you're using the stock wiring, why add a fuse? You'd only need a fuse if you were running a line directly to the battery as all stock power lines are already fused.

If running directly to the battery and high boost, may want to step up to a 25AMP fuse as per Jeff Lucious

Supra pump is its relatively heavy current draw (at 13.5 V, 16A @ 43 psi, 19A @ 70 psi)

So at ~27+ psi you'd likely blow a 20A fuse