Drain fuel without pulling half the car apart? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

dave- · 01-13-2015, 07:03 PM

I have searched the forum and found many people asking the same question but no real answer. Some cars have a drain plug on the tank or you could disconnect a fuel rail etc.

I haven't done anything bad to the car, I simply am looking for an easy way to run the car on the dyno on current fuel, drain tank and then fill up with E85 so we can tune that all in the same night.

Can anyone advise on the quickest and easiest method to achieve this? If removing rear seats and pulling the fuel system apart is the only way then I won't bother.

humfrz · 01-14-2015, 01:26 AM

You might try siphoning, or pumping, the fuel out through the filler tube ...

humfrz

killboy · 01-14-2015, 02:29 AM

Modern cars have anti-siphoning ball mechanisms at the fuel filler neck to discourage fuel theft and spillage in a rollover, so it's typically easier to do with specialized tools/hoses. Here's a video of an electric version that does it:

[ame]http://youtu.be/2mGeb9s6yFE[/ame]

You can get simple/cheaper fluid hand pumps at lots of places like car parts stores, Wal-Mart, etc., but they can be really slow...1 gallon every 4 minutes or so. Just BE CAREFUL. Transferring fluid builds up static electricity, so keep static transfer situations to a minimum, (minimize touching metals with bare hands, etc) keep a fire extinguisher handy, (any time you're handling fuel) and work in a space with a good air flow so that fumes can't build up around you and cause an explosion as easily.

The car has a low-pressure and high-pressure fuel pump for the 2 sets of injectors that would be ideal for doing the job for you, I'm just not sure how you could tap into the line and let it run the fuel out into a can for you. Maybe someone else can help there...

Scenic Driver · 01-15-2015, 05:10 PM

I'm not too familiar with how the fuel system is setup in these but I assume you can pull the supply line off of the high pressure pump and jump the fuel pump relay for the other pump and drain it that way.

Whatabouteggs · 01-15-2015, 10:45 PM

Just disconnect the line before it goes into the fuel rail and jump the fuel pump relay.

01-13-2015, 07:03 PM	#1
dave- Senior Member Join Date: Feb 2013 Drives: 86 GT Location: Australia Posts: 100 Thanks: 47 Thanked 11 Times in 10 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Drain fuel without pulling half the car apart? I have searched the forum and found many people asking the same question but no real answer. Some cars have a drain plug on the tank or you could disconnect a fuel rail etc. I haven't done anything bad to the car, I simply am looking for an easy way to run the car on the dyno on current fuel, drain tank and then fill up with E85 so we can tune that all in the same night. Can anyone advise on the quickest and easiest method to achieve this? If removing rear seats and pulling the fuel system apart is the only way then I won't bother.

01-14-2015, 02:29 AM	#3
killboy Senior Member Join Date: Dec 2014 Drives: 1FRS, 1 BRZ, 2S2000s, Evo8, Dak.R/T Location: Western NC Posts: 242 Thanks: 315 Thanked 354 Times in 135 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Modern cars have anti-siphoning ball mechanisms at the fuel filler neck to discourage fuel theft and spillage in a rollover, so it's typically easier to do with specialized tools/hoses. Here's a video of an electric version that does it: [ame]http://youtu.be/2mGeb9s6yFE[/ame] You can get simple/cheaper fluid hand pumps at lots of places like car parts stores, Wal-Mart, etc., but they can be really slow...1 gallon every 4 minutes or so. Just BE CAREFUL. Transferring fluid builds up static electricity, so keep static transfer situations to a minimum, (minimize touching metals with bare hands, etc) keep a fire extinguisher handy, (any time you're handling fuel) and work in a space with a good air flow so that fumes can't build up around you and cause an explosion as easily. The car has a low-pressure and high-pressure fuel pump for the 2 sets of injectors that would be ideal for doing the job for you, I'm just not sure how you could tap into the line and let it run the fuel out into a can for you. Maybe someone else can help there... __________________ Best Regards, Darryl Cannon Build thread for our Cosworth supercharged FRS and AVO turbo BRZ

01-15-2015, 05:10 PM	#4
Scenic Driver Senior Member Join Date: Feb 2013 Drives: 13 Subaru BRZ, 02 Audi TTQ Location: Orange County, NY Posts: 456 Thanks: 61 Thanked 321 Times in 168 Posts Mentioned: 7 Post(s) Tagged: 0 Thread(s)	I'm not too familiar with how the fuel system is setup in these but I assume you can pull the supply line off of the high pressure pump and jump the fuel pump relay for the other pump and drain it that way. __________________

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01-14-2015, 01:26 AM	#2
humfrz Senior Member Join Date: May 2013 Drives: 2013 FR-S, white, MT Location: Puyallup, WA Posts: 30,432 Thanks: 29,826 Thanked 32,845 Times in 16,844 Posts Mentioned: 715 Post(s) Tagged: 2 Thread(s)	You might try siphoning, or pumping, the fuel out through the filler tube ... humfrz

01-15-2015, 10:45 PM	#5
Whatabouteggs [Citation Needed] Join Date: Mar 2014 Drives: 2014 WR Blue Subaru BRZ Premium Location: DFW Posts: 114 Thanks: 40 Thanked 45 Times in 31 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Just disconnect the line before it goes into the fuel rail and jump the fuel pump relay.

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