Welcome to Ultimate Subaru Message Board, my lurker friend!
|Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.
We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!
Serving the Subaru Community since May 18th, 1998!
Fuel Pump Madness! 2001 Legacy H6 Outback
Posted 18 September 2009 - 02:40 PM
The neighbor up the street has a 2001 Subaru Outback 6 cylinder automatic. It wouldn't start this morning. Ran fine last night. About 2 years ago, he had the fuel pump replaced (same symptoms). Almost 12 months to the day after the initial replacement of the pump (about 1 year ago), the car did the same thing it did this morning. He had it towed to the local mechanic, thinking the fuel pump went out again. Once at the mechanic, it started so the mechanic said he couldn't touble shoot if there was nothing wrong. It ran fine for the next year.
Now a year later (this morning), the same thing has happened. No start. Engine cranks fine. No life. OK, here is what I know:
Opening the fuel filler cap and listening for the pump, I hear nothing when the key is turned from off to on.
Disconnecting the fuel line from the tank at the fuel filter and turning on the key gives you no gas.
The fuel pump fuse is good. I could not locate a relay although I'm sure there is one.
I don't think the relay is the problem for the following reason:
I disconnected the electrical connector to the fuel pump (under the right side rear passenger seat). It has 6 female connectors. When you turn on the key, position #1 has 12 volts for about 1 1/2 seconds, then goes off. The next four pins have no power on key on. The 6th pin shows a constant 5 volts and remains on as long as the key is on. When you move the key to start, the first pin shows constant 12 volts (stays at 12 volts as long as the engine is cranking), the rest of the pins do the same as above including the 5 volt pin. I believe the power flow is correct. Should more than one of the six pins show 12 volts? What is the 5 volt pin (computer signal?) Does that power flow sound correct?
It appears to be the fuel pump or the in-tank electrical connection to the tank. Is there any way to confirm the pump is bad, short of buying a fuel pump and crossing your fingers? Where is the best place to buy one? I tried 1st subaru parts dot com however they have the whole assembly for about $273. Other sites show a pump only for as little as $55. I did find a pump only, brand Airtex, for $130. Is that a good brand? Is there a common problem with the outbacks and their fuel pumps or the in-tank electrical connections? Due to factory problems, is it best to buy the whole assembly instead of just the pump inself? Could you put this problem on your Subaru site and ask the experts?
Is the fuel pump bad again? Are there aftermarket brands to stay away from? Is ther some way to confirm the pump is faulty? Has someone out there bought an "inexpensive" pump and had good luck with it? And, lastly, although it looks like it is a very simple job, is there something I should look out for during the removal and replacement?
Any help would be great!!! thanks everyone!!!
Posted 18 September 2009 - 02:42 PM
Walbro GSS341 fuel pump with kit.
Will that pump and kit fit a 2001 Subaru Outback 6 cylinder?
Posted 18 September 2009 - 05:34 PM
There should be a relay for the pump in the main relay/fuse box under the hood. The owners manual should tell you which one is which. Try swapping it with another relay and see if that works.
Posted 18 September 2009 - 06:55 PM
Can you back-probe the connector WHILE it is connected to the fuel pump? That's a much more valid test.
Also, I don't know if this particular pump is grounded through the tank or externally, but you also need to verify that the ground pin of the pump is at ground voltage- i.e. there should not be any reading on your meter if you measure between the ground on the pump and the chassis of the car.
There are plenty of 10+ year old, 200K mile Subarus out there with their original fuel pumps, so the failure of two seems a bit fishy. I wonder if there's a bad connector which was "fixed" by unplugging and reseating during the first replacement of the pump. Then again, perhaps the first failure was a fluke and the replacement pump was substandard- you could be right.
Fairtax's idea is a good simple way of isolating the problem too.
Posted 18 September 2009 - 08:17 PM
maybe it was replaced the first time with aftermarket or something cheap.
Subaru ones rarely fail, just get a new or used one. should be very cheap as there is zero demand for them.
i wouldn't mess with those aftermarkets/kits or non-OEM style as you'll likely have to do some wiring. a fuel is just a pump so in some ways you can install dozens and dozens of different pumps in that OBW - probably fuel pumps from an Army tank if you wanted to resize the lines and wire it up. the wiring can be annoying though and who wants to go cutting connectors on a 2001 OBW?
Posted 19 September 2009 - 12:11 PM
Posted 20 September 2009 - 11:41 AM
The power to the pump motor is on a red/black wire and is really pin 2 of the connector that ties to the pump. The even number pins are on that row of pins and the odd numbered ones are on the other row of 3. The ground side of the pump is a black/white wire on pin 1.
Edited by Cougar, 20 September 2009 - 11:51 AM.
Posted 06 October 2009 - 12:01 PM
All is well and his H6 is back on the road. thank you to ALL!!!!
0 user(s) are reading this topic
0 members, 0 guests, 0 anonymous users