Does anyone know where the Fuel Relay Switch is located?

[amanzoli]

I am trying to locate the Fuel Relay Switch in the 2015 BRZ, Can someone please explain where it is. Also does anyone have a picture of it or can they take a picture of it.

[Ultramaroon]

Originally Posted by amanzoli

I am trying to locate the Fuel Relay Switch in the 2015 BRZ, Can someone please explain where it is. Also does anyone have a picture of it or can they take a picture of it. I need to pump the gas out of my tank and from videos I have seen on you tube of people bypassing the relay switch, this is the most efficient way to do it. Any help would be appreciated.

I'm pretty sure the pump driver is on the right side behind the door. I don't think it's controlled with a simple relay but don't take my word for it. Link to manuals are in my sig.

[amanzoli]

I am looking for the relay that I can use a paper clip to switch into the open position so it continuously pumps the gas. Rather then it just priming. I know this is a way to do it, but to sit and press my start button until 11 gallons is gone will take forever.

[Ultramaroon]

Originally Posted by amanzoli

I am looking for the relay that I can use a paper clip to switch into the open position so it continuously pumps the gas. Rather then it just priming. I know this is a way to do it, but to sit and press my start button until 11 gallons is gone will take forever.

You can run it with techstream. I don't know if it has a duty cycle but it's not designed to run all the time. It's designed to maintain pressure in a closed system.

[amanzoli]

Originally Posted by Ultramaroon

You can run it with techstream. I don't know if it has a duty cycle but it's not designed to run all the time. It's designed to maintain pressure in a closed system.

What is that and how does it work?

[Ultramaroon]

Originally Posted by amanzoli

What is that and how does it work?

Toyota diagnostic software and a j2534 passthrough device. It runs from a windows computer and plugs into the obdii port.

[navanodd]

Originally Posted by Ultramaroon

You can run it with techstream. I don't know if it has a duty cycle but it's not designed to run all the time. It's designed to maintain pressure in a closed system.

I agree. Wouldn't recommend running this constant to drain all 11 gallons. If you can get it going, it should be intermittently to allow the pump to cool down. Otherwise there is a good change you will overheat and burn out the fuel pump.

[amanzoli]

Originally Posted by navanodd

I agree. Wouldn't recommend running this constant to drain all 11 gallons. If you can get it going, it should be intermittently to allow the pump to cool down. Otherwise there is a good change you will overheat and burn out the fuel pump.

When you are driving doesn't the fuel pump run constantly? Or is it only to prime the fuel lines? I'm a bit confused. I thought as long as fluid was running through the pump it would not burn out.

[Grady]

Originally Posted by amanzoli

When you are driving doesn't the fuel pump run constantly? Or is it only to prime the fuel lines? I'm a bit confused. I thought as long as fluid was running through the pump it would not burn out.

Yes this pump is a 100% duty cycle pump. However when you run out of gas and it starts to cavitate it will loose lubrication and overheat quickly.

[navanodd]

Originally Posted by Grady

Yes this pump is a 100% duty cycle pump. However when you run out of gas and it starts to cavitate it will loose lubrication and overheat quickly.

I'm going on the assumption here that this is a small centrifugal pump. Even if it is turned on, with the small amount of flow for normal driving the pump will not be drawing much power.

Locking this pump at full output with no restriction on the fuel line is asking the pump to do more work than usual. It is possible that it is designed with this in mind. The more current the pump is drawing, the more things are heating up. This type of pump usually doesn't like to run without any back pressure.

If these are positive displacement pumps, then go right ahead and only get concerned about heat when the tank is near empty. Backpressure won't matter either. A positive displacement pump will always flow the same amount, so it would have a kickback to dump fuel back to the fuel tank when it is pumping more fuel than the engine needs.

Anyone know what typical construction of a fuel pump is?

[amanzoli]

I decided to pull the fuel pump assembly out and use a battery operated transfer pump to siphon the gas out.