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Cool 03-28-2013, 03:11 PM

The wording "booster pump" FTW.


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Default 03-29-2013, 09:57 AM

Quote:
Originally Posted by v8bait
I speak of boost-a-pump not as a trademark but more as a "boost" as in an increase in output to a "pump" as in the OEM fuel pump. I apologize if I infringed any trademarks or created confusion, lol. Probably should have said helper pump or inline pump option. Force of habbit.
I don't think you infringed on any copyright laws . But, I like to be as clear as possible so there is absolutely zero room for confusion!


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Default 04-24-2013, 06:41 PM

Fuel pump ordered.... time to get this done. Thanks for the DIY!


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Default 04-24-2013, 10:07 PM

Good luck!
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Default 05-03-2013, 08:40 PM

Well... got everything taken apart, wired up... but the parts store sold me the wrong hose and now I have to wait until morning to put it back together.


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Default 05-05-2013, 08:08 AM

Thanks for a fantastic DIY.... every time I had a question, I pulled this up and the answer was there. Low pressure seems to be holding strong, but I am getting slight high pressure dips on close to 100% E85


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Default 05-05-2013, 12:08 PM

I thought I would share that I found the weak point on this setup. The hose clamp connection to the Fuel Filter 'IN' is not ideal. Mine popped off on an extended WOT pull up a long hill in 4th. If you play with it a little with your hands, you will notice the hose over the smooth surface of the Filter end does not create a good grip. Putting the hose clamp on helps, but I would like to find a better method to securing this connection. At a minimum, I would make sure that both hose clamps on the Filter IN and OEM LPFP OUT are VERY tight. Don't go too tight on the LPFP OUT, since it's plastic. But just make sure it's very secure.

Again, I would rather use some sort of barbed fitting like on the Walbro pump, or a snap-lock style like the OEM fittings. Any suggestions would be greatly appreciated. Just be aware you might have the same thing happen to you!

Steve


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Default 05-06-2013, 08:23 AM

Quote:
Originally Posted by Feshdogg
I thought I would share that I found the weak point on this setup. The hose clamp connection to the Fuel Filter 'IN' is not ideal. Mine popped off on an extended WOT pull up a long hill in 4th. If you play with it a little with your hands, you will notice the hose over the smooth surface of the Filter end does not create a good grip. Putting the hose clamp on helps, but I would like to find a better method to securing this connection. At a minimum, I would make sure that both hose clamps on the Filter IN and OEM LPFP OUT are VERY tight. Don't go too tight on the LPFP OUT, since it's plastic. But just make sure it's very secure.

Again, I would rather use some sort of barbed fitting like on the Walbro pump, or a snap-lock style like the OEM fittings. Any suggestions would be greatly appreciated. Just be aware you might have the same thing happen to you!

Steve
I noticed that my output hose came off the filter when I first put the assembly in the tank. I had to pull it back out and really crank down on the hose fitting. I'm still not sold that it's a long-term solution... i've got a 10mm wrench and flat-head in the back seat in case I get stranded somewhere. Let me know what you come up with.... it's easy enough to pull it back out. thanks!


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Default 05-06-2013, 10:26 PM

This may be an option for the interface between the walbro and the filter that would eliminate the FI line and the hose clamp and help keep things nice and tidy. I'd have to do some checking as to the actual size of the filter.




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Default 05-07-2013, 11:05 AM

For the guys that have done this DIY; Have you noticed if there was stock fuel filter anywhere in there? If not where is the fuel filter? I would like to change mine since i'm going to be in there already. Another quick question, is that fram filter that everyone is using is using is it e85 compatible? Since we are all worried about everything else that we are putting in there being able to withstand e85. I'm just wondering as I am very close to doing this myself! I like to do things once! j/k
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Default 05-07-2013, 03:33 PM

So... today i filled up for the first time since the upgrade and I notice that fuel is leaking underneath the right rear passenger seat. What could be causing this? It doesn't seem to have any leakage into the cabin.... where is this coming from??????


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Default 05-07-2013, 04:00 PM

If your seal is bad at the "top hat" portion of the LPFP assembly, fuel would leak, down the sides of the tank, and on to the ground. It wouldn't leak in to the cabin.

07tundra...the filter we use is metal...no signs of degradation as i have looked at it a few times now. The only other filter in the LPFP is a mesh filter that is attached to the stock lpfp...you'll have a heck of a time replacing that without disassembling the lpfp assembly. You don't need to replace it.



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Default 05-07-2013, 04:01 PM

Quote:
Originally Posted by SteveAZ
If your seal is bad at the "top hat" portion of the LPFP assembly, fuel would leak, down the sides of the tank, and on to the ground. It wouldn't leak in to the cabin.
that makes sense - i'll try to get a tighter seal and see if that helps. thanks!


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Default 05-07-2013, 05:07 PM

Quote:
Originally Posted by SteveAZ
If your seal is bad at the "top hat" portion of the LPFP assembly, fuel would leak, down the sides of the tank, and on to the ground. It wouldn't leak in to the cabin.

07tundra...the filter we use is metal...no signs of degradation as i have looked at it a few times now. The only other filter in the LPFP is a mesh filter that is attached to the stock lpfp...you'll have a heck of a time replacing that without disassembling the lpfp assembly. You don't need to replace it.
thanks
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Default 05-07-2013, 05:37 PM

Steve - thanks for your help. One of the fuel level sensor wires had gotten itself in the seal and I didn't see a leak because the tank was almost empty. I only put a few gallons in for testing, so when I filled up this afternoon and began smelling gas I knew something was wrong. It was an easy fix, and oddly my fuel gauge seems a little more correct now.


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Default 05-07-2013, 10:08 PM

Happy to hear it....easy to get a wire or that black plastic piece that attaches the upper and lower assembly caught in the seal.



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Default 05-20-2013, 07:36 AM

Solid DIY, very easy to follow. I was wondering if this setup allows for a 100% E85 setup or is this more inline of a E30 flow? Thanks.
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Default 05-20-2013, 07:41 AM

I was able to run 100 percent at 18.5 psi


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Default 05-23-2013, 04:12 PM

I had issues with my HPFP at 100% with no meth - but 75-80% seems to work well for me.


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Default 06-05-2013, 09:31 PM

Quote:
Originally Posted by SteveAZ
Look familiar?



I found the quick connect fittings for the top of the stock pump/fuel filter...



..looking for a place to order them but they come with your favorite kind of clips (see previous pic)

Nice job on the DIY...good times!
Can you tell me where you got that damn clip? I broke mine
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Default 06-05-2013, 10:42 PM

Quote:
Originally Posted by badass335
Can you tell me where you got that damn clip? I broke mine

Here you go. Make sure you verify dimensions and fit before ordering as I have not verified it for myself.

Your local BMW dealer is probably a safer bet and will get you back on the road sooner.

Good luck!



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Video of our Stage 2 LPFP upgrade installation.

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Default 06-06-2013, 08:52 AM

I've got everything on hand to do this install, besides the mess of getting into the tank is there any reason to wait and see how the inline mounting under the car goes? Just don't want to put it in the tank and have problems with it, I am OK waiting.


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Default 06-07-2013, 05:06 PM

Quote:
Originally Posted by mykal335xi
I've got everything on hand to do this install, besides the mess of getting into the tank is there any reason to wait and see how the inline mounting under the car goes? Just don't want to put it in the tank and have problems with it, I am OK waiting.
It's not that bad getting into the tank if you don't mind smelling like gas. However, if I didn't have an immediate need I'd go under the car since it's cleaner.


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Default 06-07-2013, 06:41 PM

So in my opinion here is how I'd break it down at this point.

450 replacement pump

Pro's: Higher flow rating, cleaner install when done properly, E85 warranty.

Cons: Modifications to bucket and plumbing can be tricky.

255 intank/inline

Pro's: Easiest to install and provides adequate flow and pressure for most

Con's: Extra assembly in tank that is still susceptible to plumbing issues, higher current draw on stock wiring harness that may be limiting the pumps performance, no E85 warranty. The upside is that they're cheap, will be easy to replace, and in the event of a pump failure...no big deal, you'll just be limited to the stock pump capacity until you get it replaced.

255 external inline

Pro's: Higher pressure at LPFP sensor is all we really know at this time

Con's: Installation is a bit more difficult, no E85 warranty, pump modification required.

Overall I like the idea of the external pump better as it has the potential to be a cleaner PNP installation and isn't limited by the stock regulator. However, there are still a few issues to be worked out and more testing is needed.

If....and that is a big if! I get good data and we can get past the current issues of back pressure, volume, and a couple other thus far unsupported hypothesis, I will share everything that I have done and put together a PNP DIY kit. The downside will be that the pumps will carry no warranty. As it stands, Walbro won't warranty them for E85 from what I have read.



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Video of our Stage 2 LPFP upgrade installation.

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Default 07-01-2013, 01:27 PM

Has anyone seen this Setup 2 installed into a 535?

I'm just researching it now to confirm it works. We have a slightly different bucket and possibly different connectors. Don't want to go and order a bunch of parts to find they don't fit.

I've somehow managed to have two different performance shops unable to get the Walbro replacement option to work, so I'm looking at moving over to a simpler upgrade option.


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