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Forced Induction Forum Sponsored by Active Autowerke
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Old 12-16-2009, 01:54 PM   #1
bluejeansonfire
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Walbro(ish) fuel pump install in e46nonM



So I knew I'd need this... a few days after my car started running, over nothing, it started to lean out. My stock pump had nearly 120k miles on it and I'm one to run the tank dry, completely dry, I've pushed my car to pumps many times over.

So, yesterday I received in the mail the TRE 340 walbro knock-off pump. Why a knock off? Walbro is so cheap. Walbro has no warranty, TRE gives me a year's warranty... and it's a bit cheaper, and TRE sells it with a "BMW" install kit for $69.99.
Now, I think this install kit is meant for e36s, but we're nearly e36s, so I figured I'd give it a whack.

Above is a picture of the assembly almost complete. When removing the stock pump from its carrier, seen above attached to the larger carrier, i dropped the pump carrier with the pump and it shattered. Lucky for me, not 20ft away was a used e46 m pump assembly with a slightly broken larger carrier and a bad pump. So I used its carrier. Keep in mind, the carrier of the nonM pump is meant for the nonM's fatter pump, while the M pump is skinnier, I think more what this kit was intended for. With some ingenuity, this can be fitted to the nonM, just needs more material to hold the pump in the carrier.
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Old 12-16-2009, 02:09 PM   #2
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ok im totally lost, how did you do this, do you just pop out the stock unit and pop this one in?
is it the black cylindrical thing and tub, how different are the power connections, or does the kit handle that?
whats that bag looking thing?

sorry i dont knwo jack about pumps but my OEM pump has over 180k miles on it, so this has my interest.
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Old 12-16-2009, 10:36 PM   #3
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Im glad you are back boosting at 13psi...
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Old 12-16-2009, 10:52 PM   #4
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I thought the OEM M3 pump could simply be dropped into a non-M. So if you used the M3 carrier, why would you need to do some further mods to make it fit?
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Old 12-17-2009, 12:16 AM   #5
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Quote:
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I thought the OEM M3 pump could simply be dropped into a non-M. So if you used the M3 carrier, why would you need to do some further mods to make it fit?
I'm using a walbro equivalent 255lph. I don't think the e46M pump will flow that much. The e46M pump might be sufficient, it might not, but this is proven to hold up 550-600whp. The pump didn't have the strapping bevel on the outside of the body like the oe pump, nor is it as tall, so I used the included neopreme jacket folded over once to secure the pump in the clips of the carrier.
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Old 12-17-2009, 01:11 AM   #6
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What about my n00b question?
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Old 12-17-2009, 01:13 AM   #7
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Is the heatshrink fuel-resistant?
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Old 12-17-2009, 01:17 AM   #8
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What about my n00b question?
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Old 12-17-2009, 02:14 AM   #9
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Sweet, Julio.
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Old 12-17-2009, 02:22 AM   #10
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Is that a mini or a maxi pad on the bottom of the pump?
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Old 12-17-2009, 07:59 AM   #11
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Quote:
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What about my n00b question?
two-wire solder. black thing in middle is new pump. bag is filter pickup
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Old 12-17-2009, 08:00 AM   #12
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Quote:
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Is the heatshrink fuel-resistant?
it was a concern initially, but without internal glue, yes
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Old 12-17-2009, 08:03 AM   #13
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two-wire solder. black thing in middle is new pump. bag is filter pickup
yaayy, thanks.

so any suggestion for which pump to get for a none boosted 328?
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Old 12-17-2009, 08:04 AM   #14
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Quote:
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yaayy, thanks.

so any suggestion for which pump to get for a none boosted 328?
stock
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Old 12-17-2009, 08:05 AM   #15
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stock
stock aint cheap
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Old 12-17-2009, 08:09 AM   #16
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Quote:
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stock aint cheap
you can do the same thing i did too
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Old 12-17-2009, 08:10 AM   #17
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so running a higher rating pump than needed wont hurt anything, or even damage said pump?
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Old 12-17-2009, 05:58 PM   #18
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Quote:
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so running a higher rating pump than needed wont hurt anything, or even damage said pump?
not unless you overwhelm your fpr
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Old 12-17-2009, 06:59 PM   #19
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eeeehh... on the sellers ebay site they recomend the 361, so im slowly researching that.
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Old 12-17-2009, 07:01 PM   #20
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Any idle or driveability issues with the increased flow rate? Need for a retune based on extra fuel capability?
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