Subject	Custom Wiring of Dual Fuel Pump with 2 Speeds
Posted by	tiale11 on May 25, 2012 at 8:42 PM
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Message	I am fairly new to making circuits so any input regarding the circuit below will be well received. The goal for this circuit is to run dual fuel pumps at all times and also having 2 speeds based on manifold pressure (turbo motor of course). In other words, I want the fuel pumps to only run at full speed after a manifold pressure, that I set on the Hobbs switch, is attained or surpassed. The diagram below illustrates what I came up with. Does it look solid? Parts would be: - 40 amps inline circuit breaker - 50 amps single pole double throw relay - 5 AWG wire (Blue), 8 AWG wire (Green), and 22 AWG wire (Red) assuming a 75 ohm coil resistance - ~0.5 ohm resultant resistance to drop voltage and power by half (will probably need to have a couple in parallel to handle the power drawn by the fuel pumps) Some of the links I used for calculation references: Wire Size Fuel Pump Specs Coil Resistance for 45amps Relay
Follow Ups	Custom Wiring of Dual Fuel Pump with 2 Speeds - tiale11 20:42:30 05/25/12 sweet! thanks for the writeup (n/m) - preprodigy 04:49:21 05/26/12 I wouldn't call it a writeup... - tiale11 08:17:33 05/26/12 Re: Custom Wiring of Dual Fuel Pump with 2 Speeds - MaxxAction 20:53:47 05/26/12 thanks. I'll see what he has to say on the topic. (n/m) - tiale11 21:20:37 05/26/12
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