Strick1

I have read about guys using a "hot wire kit" from Pure Choice. What does this do? Does it run from the front of the car to the tank/pump connections?

Pocket

iTrader: (24)

A hot wire kit is basically a relay and large gauge wiring so your pump will have a constant voltage at all times. Stock wiring is 16ga, fine for the stock pump, but when you upgrade to a bigger pump, the draw is increased. Resistance across a wire is fixed, so increasing the current for the pump means a larger voltage drop, meaning your bigger pump will be running at peak. Increasing the size of the wire reduces the drop, basic Ohm's law stuff. Hotwire kits are off-the-shelf kits to solve this for people that dont know how a relay works. If you can handle 4 wires and a universal relay, then save yourself $50

Orr89RocZ

iTrader: (20)

True hot wire kit runs the power off the alternator for the pumps. On stock tank wiring the kit gives 1 more volt to the rear on average. That could be 50-75 hp more fuel if you need it. 500-550 whp cars def should consider it

Vast majority of cars do not need it imo

Strick1

Okay, since my 83 camaro doesn't have an electric fuel pump, I need to run wiring to the rear for the 2001 gas tank and fuel pump. When the pressure reaches a certain pressure, does the pump shut off? I'm not sure how the system works.

Pocket

iTrader: (24)

No, the FPR bypasses excess pressure back to the tank. For your LT1, its the little thing on the back of the fuel rails

Strick1

I understand that part, but does the fuel pump keep running so the fuel is circulating from the tank to the fuel rail and then back to the tank? Why do I ask? When you first turn on the key, you can hear the fuel pump run for about 3-4 seconds, then it sounds like it shuts off once pressure is obtained. Or is it when the FPR opens. Thanks for the lessons.

Orr89RocZ

iTrader: (20)

Pump runs 3-4 seconds to prime system. When key is in run position and engine is running, pump is on 100%. regulator opens at certain pressure to bypass flow back to tank. Whole system should be circulating fuel

You basically just need a relay to activate with engine on. Priming however has been ecm controlled.

Also with the 2001 gas tank there is a regulator on the return port of the pump bucket assembly. Gut this if your motor has a regulator at the rails

If you use factory tank regulator you need the latemodel fuel filter that bypasses flow back to tank

Strick1

Thank you very much. If I plan on using my FPR on the fuel rail and bypassing the FPR in the tank (basically using my 95 LT1 fuel set up), do I need the PCM to control the priming or can the direct wiring (hot wiring kit) handle it or bypass the PCM all together? On the plugs coming out of the 2001 fuel pump there are 7 wires, 3 on one plug and 4 on the other. I know one plug is for the fuel level sensor. How many wires control the fuel pump?

Orr89RocZ

iTrader: (20)

My guess is you could bypass the ecm and just have pump turn on when ignition is in run position. Or put fuel pump on a switch.

Pump has a power and a ground. Fuel level for gas gauge has 2 wires. Thirdgens have only 1 wire for the fuel level sensor. Racetronix sells the adapter/conversion harness connector to allow 4th gen 4 wire plug to go to thirdgens body 3 wire connector. Think all it does is basically combine the two level sensor wires. Or it just uses 1 of them. But it works lol

If you dont have body wiring at the rear for fuel pump then just run a large gauge wire from relay for power and ground to body somewhere. Then use 12 bolt trigger from ignition to handle the activation

QwkTrip

iTrader: (22)

Kit probably joins the fuel sender ground to the fuel pump ground to reduce wire count at the connector.

Pocket

iTrader: (24)

Its like that from the factory. 4th gens have a separate ground for each

As stated before, the 4 pin is pump 12v and grd along with sender signal and grd. The other 3 pin connector is tank pressure sensor which you wont use at all

Strick1

Now that makes sense. Can I assume that the tank pressure is what controls the vent solenoid valve operation?

five7kid

iTrader: (14)

No. The PCM uses tank pressure as one of the parameters to control tank venting. Fuel level is another.