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Old 10-19-2010, 03:39 PM   #1 (permalink)
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Default Where is the Fuel Pump Relay or Fuse?!?

Hi,

I'm trying to do a compression test with a compression tester that I bought some years back. I want to cut off the fuel supply so that it isn't affecting the compression readings. I can't find the fuel pump relay for the life of me. Anyone know where it is? I found a brown relay with a brown connector that clicks when key is in ON position, but when I undo it, it will not crank the engine when turned to the START position.

The car is a 2005 X.

Thanks.

-Dustin
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Old 10-19-2010, 05:05 PM   #2 (permalink)
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When I was working on our '03 X this summer, I couldn't find a fuse specifically for the fuel pump, but I did find the fuel pump relay. It's located to the right of the glove compartment, up a bit, mounted with another relay.

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Old 10-20-2010, 11:31 AM   #3 (permalink)
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To the right of the glove box there are 3 relays mounted on the same bracket. There are 2 round ones with round white connectors with about 4 pins I think. Between those two is a brown one with a brown connector. The brown one with the brown connector clicks when the key is turned to the START position. However, if you disconnect it, the key won't turn the starter so I can't do the compression test.
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Old 10-20-2010, 11:38 AM   #4 (permalink)
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Hmmm... must be different on the later model Forester. When I unplugged the relay on the '03 X, I didn't hear the fuel pump start up & I was able to crank the engine. We installed a new turbo, so we wanted to make sure the oil pressure was good to the turbo before firing up the engine. I haven't tried this on the '07 FSXT.

Looking at the wiring diagram, the relay you want is the rearmost one. The front one (brown connector) is the "main" relay & that would kill everything... which isn't what you want. The one you want will have a white or natural color connector.

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Old 10-20-2010, 12:38 PM   #5 (permalink)
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From front to back it goes: Round whitish, rectangular brown main relay, round whitish. The connectors are kind of buried back there and somewhat behind that extension of the door sill that forms a kind of kicker panel on the extreme right of the passenger footwell.

I don't have the wiring diagram yet. Does it say how many pins and what color wires are going to the fuel pump relay with the round white-ish connector?
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Old 10-20-2010, 12:57 PM   #6 (permalink)
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This may help. On the attached picture, B47 is the main relay & B46 is the fuel pump relay. You may have to click on the image a couple times to enlarge it.

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Old 10-20-2010, 01:20 PM   #7 (permalink)
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Well I had believed I found it until I saw this. I unplugged what looks like B309 in that diagram, and I would no longer hear the fuel pump pressurize when turning the key to ON.

That diagram makes it look like B309 isn't on the same "plane" so to speak as B46 and B47. But on Mine it looks like they are all on the same sort of line and all on one bracket. The rear most connector is actually black, but goes into a white relay. Then there is the brown connector/brown relay in the middle. And a white connector/white relay front most on that bracket. The front most one is the one that seemed to keep the fuel pump from pressurizing when I unplugged it. The rear most connector seems impossible to get at without removing all the associated dash plastics.

What are B309 and B126?
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Old 10-20-2010, 02:48 PM   #8 (permalink)
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B309 = Electronic throttle control relay
B125 & 126 = Line end check connector

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