02rusWRX Posted May 22, 2009 Share Posted May 22, 2009 Has anybody ever tried draining their fuel tank? Some cars have drain plugs on the bottom. Do LGT's have these, and if so, is there any reason not to do it on our cars? I haven't looked myself yet, but will later on tonight or tomorrow. Any feedback ahead of time would be appreciated. Thanks! -Sergei Link to comment Share on other sites More sharing options...
Mr. Sinister Posted May 22, 2009 Share Posted May 22, 2009 Siphon it out through the filler neck. Link to comment Share on other sites More sharing options...
P06781 Posted May 23, 2009 Share Posted May 23, 2009 When I had my e85 tune they disconnected one of the fuel lines and drained it into a can using the fuel pump with iginition on .... Link to comment Share on other sites More sharing options...
frkkevin Posted May 23, 2009 Share Posted May 23, 2009 Wot .. 512whp/465ftlb 2005 5EAT Legacy (Build Log) Videos - - Link to comment Share on other sites More sharing options...
02rusWRX Posted May 23, 2009 Author Share Posted May 23, 2009 Thanks guys! That's all really good advice! -Sergei Link to comment Share on other sites More sharing options...
Whatisit Posted May 23, 2009 Share Posted May 23, 2009 Wot .. x2, a couple of runs in boost should empty your tank rather quickly Link to comment Share on other sites More sharing options...
02rusWRX Posted May 27, 2009 Author Share Posted May 27, 2009 For future reference: 2 methods that I used: 1. Remove rear seat cushion (just pops off), remove fuel pump cover, which is on the passenger side and held on by 4 Phillips screws. Then disconnect the middle fuel line (one of the ones pointing towards the front of the car) and use a long fuel hose to route the fuel to an empty canister. This method is especially useful if you're about to do a fuel pump install. 2. Remove the bottom hose that's connected to your fuel filter (right by the fuse box) and slip on a long fuel hose. In both cases you need to connect the green plugs to put the car into test mode and then turn the ignition to the ON position (but don't crank) and then the fuel will start flowing. -Sergei Link to comment Share on other sites More sharing options...
Legend Posted May 27, 2009 Share Posted May 27, 2009 ^^Isn't the fuel filter just the "sock" at the end of the fuel pump inside the assembly? I wasn't aware of an additional filter... Do the test connectors really need to be connected? Doesn't the fp prime with key 'on' anytime? My '05 LGT My '07 Supercharged Shelby Link to comment Share on other sites More sharing options...
02rusWRX Posted May 27, 2009 Author Share Posted May 27, 2009 The sock filter in the fuel pump is there to just filter out the big shit (like rocks). There's a fine particle filter under the hood. It's a square-ish black box with fuel lines going in and out of it, right by the fuse box. You have to put the car into test mode. If you turn the car on without this, the pump will only prime for a couple of seconds. In test mode, it keeps cycling. -Sergei Link to comment Share on other sites More sharing options...
Legend Posted May 27, 2009 Share Posted May 27, 2009 Good info, Sergei. My '05 LGT My '07 Supercharged Shelby Link to comment Share on other sites More sharing options...
Guest Posted May 27, 2009 Share Posted May 27, 2009 The sock filter in the fuel pump is there to just filter out the big shit (like rocks). There's a fine particle filter under the hood. It's a square-ish black box with fuel lines going in and out of it, right by the fuse box. You have to put the car into test mode. If you turn the car on without this, the pump will only prime for a couple of seconds. In test mode, it keeps cycling. -Sergei Totally incorrect. Not on 05-09 Legacy. There isn't underhood filter. What you're seeing there fuel pressure regulator/by-pass valve (on 05-06 LGT). The fuel pump assembly contains the filter AND the sock. Not sure exactly, but 04 or so and later Impreza also has the filter in the tank, not under the hood. Link to comment Share on other sites More sharing options...
02rusWRX Posted May 27, 2009 Author Share Posted May 27, 2009 Totally incorrect. Not on 05-09 Legacy. There isn't underhood filter. What you're seeing there fuel pressure regulator/by-pass valve (on 05-06 LGT). The fuel pump assembly contains the filter AND the sock. Not sure exactly, but 04 or so and later Impreza also has the filter in the tank, not under the hood. That's right. It's the FPR not fuel filter. It's still the black box by the fuse box, I was just incorrect about WHAT it was. I didn't see any fine particle filter when I took apart the fuel pump assembly though, just the sock. -Sergei Link to comment Share on other sites More sharing options...
Guest Posted May 27, 2009 Share Posted May 27, 2009 That's right. It's the FPR not fuel filter. It's still the black box by the fuse box, I was just incorrect about WHAT it was. That's a minor difference anyway! I didn't see any fine particle filter when I took apart the fuel pump assembly though, just the sock. -Sergei Need to look harder next time! It's enclosed in top part of the bucket. It's actually serviceable element and can be replaced (with the part of the bucket). Link to comment Share on other sites More sharing options...
02rusWRX Posted May 27, 2009 Author Share Posted May 27, 2009 That's a minor difference anyway! Need to look harder next time! It's enclosed in top part of the bucket. It's actually serviceable element and can be replaced (with the part of the bucket). Are you talking about the top cap, which has the fuel line connectors and the main harness connector? I didn't need to take that portion of the pump assembly apart during the Walbro install. The fuel filter and FPR are practically the same thing ... blood brothers -Sergei Link to comment Share on other sites More sharing options...
SSpeed Posted September 28, 2016 Share Posted September 28, 2016 I know this is super old, but still very relevant. I'd like to drain 5gal out before I go to the track. Is it a 2-person job? In other words, if I put the hose in a jug and turn the key on, will it eject itself out of the jug and shoot all over the place like a loose fire hose without someone holding it? I assume it's 42(ish) psi out of the small hose at that point since it's post FPR? Link to comment Share on other sites More sharing options...
SSpeed Posted September 28, 2016 Share Posted September 28, 2016 No idea what I'm doing wrong. I connected to the lower line as this thread says, which I also confirmed in the service manual. Hooked up a line to the tank side of the lower delivery line and left the engine side disconnected. Connect the green connectors and turn on the key, the gas can starts filling, but then gas starts pouring out the engine side of the delivery connector as well. With a series setup, that suggests fuel is coming from the tank on the return? How can that be? Link to comment Share on other sites More sharing options...
RWebb Posted September 28, 2016 Share Posted September 28, 2016 use your right foot. Link to comment Share on other sites More sharing options...
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