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Old 04-03-2009, 03:47 PM   #1
RallieConGoggle
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Fuel Pump screen

My check engine light came on, and gave a code for random misfires, but no code for MAF or O2 sensors and the coil pack is brand new, so I took a look at the fuel pump. WHen I removed the pump, I saw two screens sitting in the bottom of my fuel tank, one large one and one that fit into the bottom of the pump.

Can anyone tell me where the big one goes? It looks like it goes in the opening for the fill line and I knocked it out when I was trying to syphin (don't buy a "transfer pump" from autozone!)

Also, there's something that looks like a breather element on the side of the pump. Where is the pump's intake? Could the fact that this screen fell out be the root cause of my problem?

I'll post pics later.

Thanks,


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Old 04-04-2009, 09:59 AM   #2
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Pics



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Old 04-04-2009, 10:05 AM   #3
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If I'm right, those screens are pre-filters for the fuel, if they're missing from the pump, who knows what it picked up from your fuel tank. It could be partially blocked. But I could also be wrong
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Old 04-04-2009, 10:14 AM   #4
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I'm thinking you're right. I bought the new pump from autozone for $65, but it's not the whole assembly, just the pump. So I'm going to have to take it apart and clean it out and put the new pump in. I'll try to post some more pics, but my battery is low on the camera.
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Old 04-08-2009, 09:39 AM   #5
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Inside of pump and sender assembly:


After I cleaned it with a Isopropyl Alcohol, a rag, q-tips, and other implements of destruction:


The terminals on the auto zone replacement pump are hard to read, but it needs to be wired as shown in this picture with the extra connector supplied with the pump:



I used Isopropyl Alcohol, but ethanol would have been better. It's best to let the alcohol dry before putting the system back together, which should only take about 10 minutes. I also fully drained the fuel tank and wiped it clean with fresh gasoline. I refilled the tank with fresh gasoline to avoid introducing any contaminants back into the system with the new pump. As soon as I reconnected the battery and started the car, there was no check engine light. It's been running for almost a week with no trouble.

I blame Michigan roads for knocking that screen out and and allowing that nastiness in my fuel pump.
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Old 04-08-2009, 09:47 AM   #6
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> I used Isopropyl Alcohol, but ethanol would have been better.


Why do you say that?
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Old 04-08-2009, 09:54 AM   #7
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Quote:
Originally Posted by penguin View Post
> I used Isopropyl Alcohol, but ethanol would have been better.


Why do you say that?

Ethanol is better and cleaning oils and contaminants. It would have done a little bit better job of breaking up the grime in the nooks & crannies that I couldn't reach with my q-tips and implements of destruction. Also, ethanol is more compatible with gasoline fuel systems. It's really not a big deal, and it did a fine job, but if you can buy Everclear in your state, I would recommend using that instead of Isopropyl.

I don't recommend drinking the Everclear, I had some bad experiences with that in college. I'm planning on getting some when I go back to Indiana to use for cleaning.

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Old 04-08-2009, 10:01 AM   #8
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P.S. To take apart the "bucket" on the assembly, you'll need a 3/16" (I think) open-end wrench. It's pretty hard to do it with a socket, but I managed.
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Old 11-03-2010, 10:35 AM   #9
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FYI: I lost the the round screen with the black plastic X on it while doing this job. This fits into the end of the fill hose to prevent siphoning.

I found it about a year later while I was mowing the lawn; it was torn. Kind of a funny story, I guess.
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Old 11-03-2010, 10:35 AM   #10
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FYI: I lost the the round screen with the black plastic X on it while doing this job. This fits into the end of the fill hose to prevent siphoning.

I found it about a year later while I was mowing the lawn; it was torn. Kind of a funny story, I guess.
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