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Old 07-07-2010, 12:21 AM   #1
Forcefed M3
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HPF Fuel Pump Upgrade!

I swung into HPF today to have their soon to be released fuel pump upgrade installed into my car. A very welcome safety upgrade that will work on every F/I e46 m3, contact dave at HPF for pricing and release date. My stock fuel pump slowly failed, had I not been paying attention to my air fuel ratio's I could have blown my motor. With the amount of miles I put on my car, I will be putting this pump to the test!
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Old 07-07-2010, 05:40 AM   #2
Lil. Lucas
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Is this an upgrade or an update? I've always though HPF kits removed the OEM fuel pump..
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Old 07-07-2010, 06:02 AM   #3
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stock fuel pump is used with an additonal inline booster pump
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Old 07-07-2010, 09:11 AM   #4
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It is a new intake fuel pump. Any f/i car can use this.
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Old 07-07-2010, 10:04 AM   #5
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Curious to see what pump they use, the stock pump is pretty sweet.
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Old 07-07-2010, 11:09 AM   #6
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Thanks Derek for posting this up. Yes, we are coming out with a Walbro fuel pump upgrade for existing HPF stage 2.5ers. The last 3 stage 2.5ers that left our shop already have this upgrade included in their car, and all stage 2.5ers from now on will have the pump included in their kit. All existing stage 2.5ers should purchase this safety upgrade as soon as we release it.

Reason

We have found some E46 M3 fuel pumps (especially ones with higher miles) have gotten weak over time. This will cause our kits to run a little lean at the top. If you have our kits, you will find this out because your knock siren will make a loud beep at you. If you here a loud beep in your HPF M3 (at any stage), please call us.

The Walbo 255 in tank pump out-performs the factory BMW E46 M3 fuel pump at high pressure and high flow. We've tested this in multiple BMW M3's and the pressure loss difference is significant. Some cars are losing as much as 8psi of fuel pressure on the top end.

We will have our fuel pump hanger finished shortly that will allow the walbro pump to simply drop right in. This will be a mandatory upgrade for stage 2.5 customers as they will run the risk of engine damage as their OEM pump ages. I will post up the new hanger and pricing shortly. Our fuel pump upgrade will be available for purchase for any E46 M3 including all of our staged kit upgrades.

Take care,
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Last edited by HPF Chris; 07-07-2010 at 11:13 AM.
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Old 07-07-2010, 12:23 PM   #7
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whats involved in installing this critter? do you have to drop the tank?
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Old 07-07-2010, 12:29 PM   #8
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whats involved in installing this critter? do you have to drop the tank?
It's very very easy. Just pull out the back seat, take the cover off on the passenger side and carefully lift the pump out and put the new one in. The problem is sizing as the new pump is a different size. We will have a quick drop in hanger for that shortly.

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Old 07-07-2010, 12:35 PM   #9
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verts too? i dont remember seeing any access under my seat when removed.....

i may be lying though...is it just a rubber gromet?
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Old 07-07-2010, 01:32 PM   #10
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Besides saftey, since we can run more fuel with this fuel pump upgrade, is it possible to get more boost for more power under pump gas?
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Old 07-07-2010, 02:49 PM   #11
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Originally Posted by funkboy316 View Post
verts too? i dont remember seeing any access under my seat when removed.....

i may be lying though...is it just a rubber gromet?


DIY : http://forum.e46fanatics.com/showthread.php?t=592414
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Old 07-07-2010, 03:08 PM   #12
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how about guys like me that need a upgraded fuel pump for my custom fi turbo i have a 323i. Can i use this or do you suggest just getting a m3 fuel pump?
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Old 07-07-2010, 03:14 PM   #13
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Originally Posted by funkboy316 View Post
verts too? i dont remember seeing any access under my seat when removed.....

i may be lying though...is it just a rubber gromet?
No extra fuel for you trouble maker.. Lol
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Old 07-07-2010, 03:30 PM   #14
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Quote:
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... The last 3 stage 2.5ers that left our shop already have this upgrade included in their car, and all stage 2.5ers from now on will have the pump included in their kit...
Sweet. I am under the assumption that you will be installing this in my Stage 3 as well, right!
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Old 07-07-2010, 04:26 PM   #15
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how about guys like me that need a upgraded fuel pump for my custom fi turbo i have a 323i. Can i use this or do you suggest just getting a m3 fuel pump?
An M3 pump is good for 575rwhp @ 70psi fuel pressure. At this point it starts dropping off. So if your not going to make power near that level then an M3 pump will be more than enough.
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Old 07-07-2010, 04:39 PM   #16
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An M3 pump is good for 575rwhp @ 70psi fuel pressure. At this point it starts dropping off. So if your not going to make power near that level then an M3 pump will be more than enough.
An E46 M3 pump will "start" to lose fuel pressure at around 500rwhp depending on the boost level in the turbo. We run an inline pump to compensate and even with that, we start losing fuel pressure above 625rwhp with the OEM and Walbro inline. That's why we use methanol to make more than 625rwhp. With the walbro in tank and walbro in-line, we're not losing fuel pressure all the way past 625rwhp without methanol at that's at 23psi (73 static + 23psi boost = 96psi fuel pressure)

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Old 07-07-2010, 04:40 PM   #17
funkboy316
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lol....thats what i remembered being there, that rubber grommet.....had absolutely no clue you could access the fuel pump from there.....cooooool
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Old 07-07-2010, 04:50 PM   #18
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With the walbro in tank and walbro in-line, we're not losing fuel pressure all the way past 625rwhp without methanol at that's at 23psi (73 static + 23psi boost = 96psi fuel pressure) <--------- Does that mean with stage 2.5 and a new tune, with the fuel pump upgrade, I can go HIGH BOOST MODE ( pump + meth) WITHOUT THE METH 24/7?
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Old 07-07-2010, 04:58 PM   #19
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Glad I already have an upgraded in tank pump

Quote:
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With the walbro in tank and walbro in-line, we're not losing fuel pressure all the way past 625rwhp without methanol at that's at 23psi (73 static + 23psi boost = 96psi fuel pressure) <--------- Does that mean with stage 2.5 and a new tune, with the fuel pump upgrade, I can go HIGH BOOST MODE ( pump + meth) WITHOUT THE METH 24/7?
I doubt it as octane is most likely the limiting factor there.
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Old 07-07-2010, 05:13 PM   #20
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Originally Posted by xcoolnessx View Post
With the walbro in tank and walbro in-line, we're not losing fuel pressure all the way past 625rwhp without methanol at that's at 23psi (73 static + 23psi boost = 96psi fuel pressure) <--------- Does that mean with stage 2.5 and a new tune, with the fuel pump upgrade, I can go HIGH BOOST MODE ( pump + meth) WITHOUT THE METH 24/7?
I think octane would keep you from doing that on just pump if that's what you mean
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