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 Old 10-01-2012, 06:08 PM   #1
 
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Default HOW TO: Drain Fuel Tank

I had to drain a full tank of old fuel after my engine build, so I thought I might as well make a How-To for it...

1. Open engine bay fuse panel, and remove the primary fuel pump relay (labeled 'Circuit' in the diagram on the cover)

2. Create a jumper cable by crimping on two spade terminals on a short piece of wire. I used 14ga wire.

3. Plug one terminal into the port on the the fuse panel closest to the windshield. This is the +12VDC terminal:



4. Disconnect the blue fuel line connector on the HPFP. This is the line from the fuel tank to the HPFP (low pressure line).

5. Using a funnel and hose, run a line from the disconnected fuel line to a gas can:



6. Connect the other spade terminal to the port on the fuse panel just next to the one used in step 3 above. This will start the ITFP. NOTE: fuel pump relay 2 controls the high/low speed for the pump. with the relay not energized, the pump will run at low speed (which we want):



7. Profit:



Disconnect either jumper lead to stop the pump.
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 Old 10-01-2012, 06:14 PM   #2
 
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youre welcome
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 Old 01-09-2013, 12:04 AM   #3
 
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holy crap thanks for information !
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 Old 01-14-2013, 11:58 AM   #4
 
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Originally Posted by silvapain View Post
I had to drain a full tank of old fuel after my engine build, so I thought I might as well make a How-To for it...

1. Open engine bay fuse panel, and remove the primary fuel pump relay (labeled 'Circuit' in the diagram on the cover)

2. Create a jumper cable by crimping on two spade terminals on a short piece of wire. I used 14ga wire.

3. Plug one terminal into the port on the the fuse panel closest to the windshield. This is the +12VDC terminal:



4. Disconnect the blue fuel line connector on the HPFP. This is the line from the fuel tank to the HPFP (low pressure line).

5. Using a funnel and hose, run a line from the disconnected fuel line to a gas can:



6. Connect the other spade terminal to the port on the fuse panel just next to the one used in step 3 above. This will start the ITFP. NOTE: fuel pump relay 2 controls the high/low speed for the pump. with the relay not energized, the pump will run at low speed (which we want):



7. Profit:



Disconnect either jumper lead to stop the pump.


Thank you good sir! I will be using this method this weekend to also drain an entire tank of gas from my car before start up as well!!!
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 Old 04-08-2013, 12:40 PM   #5
 
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@silvapain; can you confirm this is the same on the gen2?

edit: this works as well on the gen two. the relay is in a different spot. i just tried it. standing at the driver side fender you will jump the two horizontal plugs in the circuit. these will be the two closest to you.
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 Old 04-14-2013, 10:41 AM   #6
 
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 Old 08-19-2013, 07:34 AM   #7
 
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@865ms3 pics?
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 Old 08-19-2013, 09:09 AM   #8
 
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Originally Posted by Snotrocket View Post
@865ms3 pics?
i didnt take any. if you pull the "circuit" relay stand at the drive side fender. looking at the fuse box it will the the two horizontal plugs you jump (going off of my memory and my previous post)
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 Old 08-19-2013, 10:20 AM   #9
 
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MS6?

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 Old 08-19-2013, 10:54 AM   #10
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theres a check connector on the MS6 in the underhood fuse box that you just ground one of the pins and it does the same thing.
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 Old 08-24-2013, 09:04 PM   #11
 
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Just wanna say thanks again for this thread. Me and @sho used this method to drain about 9-10 gallons of bad fuel (Akron area stations have had issues lately) from his tank tonight before the Toledo autocross tomorrow. This method is the perfect one do use in situations such as this.
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 Old 08-24-2013, 10:11 PM   #12
 
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this is great when you want to go to the track, but have a lot of fuel in the car, thanks for the advice on this last year.
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 Old 02-14-2014, 12:31 PM   #13
 
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Can this also be used to drain the tank of suspected water mixed with my fuel?
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 Old 02-14-2014, 12:36 PM   #14
 
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Originally Posted by KRheeder View Post
Can this also be used to drain the tank of suspected water mixed with my fuel?
Well it drains the tank, so yes?
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 Old 02-14-2014, 12:40 PM   #15
 
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Originally Posted by sidekick View Post
Well it drains the tank, so yes?
Yeah it does but im just thinking that seeing that water is more dense and the fact that it doesn't mix with fuel it will lay at the bottom of the tank.

its a stupid question I know, I don't have any experience with it hence the question.
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 Old 02-14-2014, 12:41 PM   #16
 
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Correct me if I'm wrong, but wouldn't this be hard on your low pressure fuel pump? I know most fuel pumps use the fuel for cooling and lubrication. Wouldn't running your tank dry like that put a lot of wear and tear on it? Not to mention it will suck all the gunk at the bottom of your tank into your fuel system and threw the pump. Seems like a good one time thing and not something to do all the time.
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 Old 02-14-2014, 01:12 PM   #17
 
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Originally Posted by cuethenoise View Post
Correct me if I'm wrong, but wouldn't this be hard on your low pressure fuel pump? I know most fuel pumps use the fuel for cooling and lubrication. Wouldn't running your tank dry like that put a lot of wear and tear on it? Not to mention it will suck all the gunk at the bottom of your tank into your fuel system and threw the pump. Seems like a good one time thing and not something to do all the time.
You're running the pump at low speed, which means it will not need as much cooling/lubrication. You also shouldn't be doing this every week, so the wear/tear should be negligible. The pump always sucks from the bottom of the tank, so all of that "gunk" would be sucked up whether the tank is low or not. That's an old wives tale as far as I'm concerned. This is also why fuel pumps have filters.

Originally Posted by KRheeder View Post
Yeah it does but im just thinking that seeing that water is more dense and the fact that it doesn't mix with fuel it will lay at the bottom of the tank.

its a stupid question I know, I don't have any experience with it hence the question.
But how do you know there is water in your tank? It shouldn't be an issue getting the water out this way, because the fuel pump will remove almost everything out of the tank doing it this way. There may still be a small amount of fuel left in the tank after doing this.
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 Old 02-14-2014, 01:13 PM   #18
 
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Originally Posted by sidekick View Post
You're running the pump at low speed, which means it will not need as much cooling/lubrication. You also shouldn't be doing this every week, so the wear/tear should be negligible. The pump always sucks from the bottom of the tank, so all of that "gunk" would be sucked up whether the tank is low or not. That's an old wives tale as far as I'm concerned. This is also why fuel pumps have filters.
Yeah I sort of agree, that is why I said maybe a one time thing, but some of the peeps above said they would use this method before going to the track. I would use the tried and true siphon method for this to be honest.
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 Old 02-14-2014, 01:25 PM   #19
 
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Originally Posted by sidekick View Post
But how do you know there is water in your tank? It shouldn't be an issue getting the water out this way, because the fuel pump will remove almost everything out of the tank doing it this way. There may still be a small amount of fuel left in the tank after doing this.
Was driving home after work today, stopped to put in some fuel.
Left the gas station and 2-3 mins later the car started acting up. Would bog at times, had no power. I had to drive slowly. Initially I thought it might be a boost leak. When I got home I checked all the clamps etc. Installed everything again. car would start, idle roughly for like 5 seconds and die. The car was fine up to the point where I stopped at the gas station. Very bad batch of fuel or water in the fuel is my best guess. I cleaned all the sensors, checked all my connections etc
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 Old 02-14-2014, 01:46 PM   #20
 
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Originally Posted by cuethenoise View Post
Yeah I sort of agree, that is why I said maybe a one time thing, but some of the peeps above said they would use this method before going to the track. I would use the tried and true siphon method for this to be honest.
What makes you think it's bad for the pump?

It's doing what it does any other time it's operating, but instead of going into the HPFP, it's going into a gas can.

As long as the pump is promptly stopped when fuel is no longer flowing, there should be no issue.

I would be more concerned with fuel flowing near live/exposed electrical circuits.

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 Old 02-15-2014, 10:03 PM   #21
 
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This method works great. Turned out the petrol attendant and the shell garage put diesel instead of unleaded. What a mission to get it all out and the system clean. For the guys with mk2's, ive attached jumped circuit as its in a different location.

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 Old 02-16-2014, 12:38 AM   #22
 
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You should do it again with gas run through it before starting the car.
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 Old 02-16-2014, 01:05 AM   #23
 
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I did yeah

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 Old 02-16-2014, 07:43 AM   #24
 
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@BZiggy10 Quick way to empty the tank.
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 Old 06-19-2014, 04:52 AM   #25
 
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So I wonder what is the exact size of our fuel tank. I know it's listed to be 15,9 gallons, but is there a reserve?
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 Old 10-20-2014, 10:39 PM   #26
 
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My MS6 sat in storage for 2yrs. Tne fuel stabilizer bottle was still on the counter that sent to my younger brother to put in when I left to Japan. I am Emptying it completely and maybe running gas through. I'm sure its bad.

Or should I siphon it all out?
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 Old 06-16-2015, 10:47 AM   #27
 
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maybe I'm going full retard, but I was hoping to get clarification for the ms6. I would like to add pics after I am successful (or fuck something up) to help others.
@superskaterxes; where/what is the check connector you are referring to?
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 Old 06-19-2015, 12:54 AM   #28
 
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Default Check connector

Think this might be it for the ms6
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 Old 10-28-2015, 07:16 AM   #29
 
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easy and smart
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 Old 04-07-2016, 05:28 AM   #30
 
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I know I'm kicking the dust off this thread but just to confirm that for the MS6 you are only pulling the check connector and grounding the top right pin and will not need a jumper?
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 Old 04-07-2016, 03:14 PM   #31
 
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Originally Posted by sailnaked6842 View Post
I know I'm kicking the dust off this thread but just to confirm that for the MS6 you are only pulling the check connector and grounding the top right pin and will not need a jumper?
yup ,just take a wire from the check connector and connect it to ground.
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 Old 06-24-2016, 04:57 PM   #32
 
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Thanks a ton for detailing this. Worked like a charm on my 08 MS3.
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 Old 04-20-2019, 07:27 AM   #33
 
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Thanks for all the info. I have a 2003
Protege5 and wonder if any of
You could confirm exactly which leads to jump? I am not sure if the relay is the same as on the 3. As responsibilities force me to drive a family truckster most days, it would be wonderful to get the 5
Back on the road. Thanks
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