[GenXG87]

Installed this last week. I decided to try this after taking the OG to Roebling Road and going into limp mode from fuel issues at 5/8 of a tank. Car is running a BM3 stage 1 tune but was stock suspension and tires that day.

Kit was pretty easy to install. Maybe 3 hours total time.

This kit is an auxiliary pump that is tethered to the jet pump line and pumps in to the fuel pump canister on the pass side. Not the most elegant solution but very cost effective and very good install instructions.

However I don’t recommend running this all the time. I pull the fuse for daily use and put it in on the track. Why? Well a couple reasons. This thing does mess with the fuel level reading. Most likely because it pumps way more fuel into pass side than is needed. The second thing is it seems to cause fuel vapor/overflow out of what I think is a tank pressure relief valve on the passenger side. This only happens when the fuse is in and the pump is running.

Here’s the good thing. Ran the car on 200TW rubber at Road Atlanta with peak G going from 0.99 at Roebling to 1.18

Ran the car to 2.5 gallons left in tank and never had an issue with limp mode or even a hiccup in performance.

That’s a very cost effective win.

I’m thinking a pump controller added to it that links into the fuel level sender would be a good way to install and forget it. Maybe I’ll program an Arduino as a home project. 😆

[fleetfoot]

After 20+ track days at Road Atlanta, AMP, and Barber my first time ever having fuel starvation issues was also at Roebling Road. Any idea why it seems to happen there? What part of the track did it show up for you?

[ThreeStripes]

Originally Posted by fleetfoot

After 20+ track days at Road Atlanta, AMP, and Barber my first time ever having fuel starvation issues was also at Roebling Road. Any idea why it seems to happen there? What part of the track did it show up for you?

Pro driver starved my 2017 exiting the museum at Barber with about a 1/4 tank. Hard rights followed by sustained WOT typically induce it with under 1/2 tank of fuel. I don’t run it under 1/2 tank any longer.

[jwr9152]

Originally Posted by ThreeStripes

Pro driver starved my 2017 exiting the museum at Barber with about a 1/4 tank. Hard rights followed by sustained WOT typically induce it with under 1/ tank of fuel. I don’t run it under 1/2 tank any longer.

The obvious question is what was his lap time?

[GenXG87]

[QUOTE=fleetfoot;30933264]After 20+ track days at Road Atlanta, AMP, and Barber my first time ever having fuel starvation issues was also at Roebling Road. Any idea why it seems to happen there? What part of the track did it show up for you?

Roebling only happened throttling out in 9. Went into limp on front straight.

Pretty sure it’s the constant right hand sweepers that make it an issue.

I’ll have the car there on Mar 11th so will have a true apples to apples comparison.

[fleetfoot]

Originally Posted by GenXG87

Roebling only happened throttling out in 9. Went into limp on front straight.

Pretty sure it’s the constant right hand sweepers that make it an issue.

I’ll have the car there on Mar 11th so will have a true apples to apples comparison.

Almost exact same scenario for me. Happened around the middle of the front straight for me on my last session of the weekend. I was at about 1/8 of a tank. I’ll be back 3/23 and curious to see what happens if I keep it filled over 1/3 tank.

[M2guru]

As an alternative, this worked well for me! I'd get issues with about a half tank, but afterwards I could go until I had less than 10 miles left to drive on the tank (according to what the was telling me). When I bought it in 2019, it was less than half the price it is now. The only problem I had was I bought it apparently before they used submersible rubber hoses because around a year the rubber hose broke and nearly left me stranded.

https://www.dinancars.com/products/e...arts/R420-0001

[GenXG87]

Originally Posted by M2guru

As an alternative, this worked well for me! I'd get issues with about a half tank, but afterwards I could go until I had less than 10 miles left to drive on the tank (according to what the was telling me). When I bought it in 2019, it was less than half the price it is now. The only problem I had was I bought it apparently before they used submersible rubber hoses because around a year the rubber hose broke and nearly left me stranded.

https://www.dinancars.com/products/e...arts/R420-0001

I considered this. Was also looking at their complete pump solution. Seems a bit pricey even now for what it was. I even was looking at their drop in solution which was even pricier.

At least now that I’ve taken the pump out I can probably do a swap in under an hour.

[E36toF87]

Originally Posted by fleetfoot

Almost exact same scenario for me. Happened around the middle of the front straight for me on my last session of the weekend. I was at about 1/8 of a tank. I’ll be back 3/23 and curious to see what happens if I keep it filled over 1/3 tank.

It happened to me with fully 1/4 tank at Roebling mid-June '22 (in other words, HOT). Felt it coming out of 2 and backed off hoping for recovery, but full vapor lock left me stranded outside turn 4 waiting on the tow truck. Half an hour later wouldn't hold a restart till I dumped a gallon of cold fuel in the tank.
Lesson learned, not less than 1/3 tank for me at that track.

[GenXG87]

Wrapped up a day at Roebling Road yesterday. Don't know how low we can run it since we refueled at lunch time. Ended up running to about 3/8 of a tank without issue. I'll take that. Last time out it was cutting out after one session and just under 3/4 tank.

Car was on the 18x10/11 APEX 275/295 RE-71RS combo. Racebox showed peak G increased to 1.18g vs 0.99g on stock tires.

I'd say that the fuel starvation fix kit was a success.

[ZM2]

Well, I've finally hit the limit of my Dinan LPFP mod, so looking into this solution.

In my case, Summit Point Main, right hand turn 1 that connects into right hand turn 2 and then WOT onto short straight. Fuel starvation even with >1/2 tank. Hasn't been an issue previously, but I'm sure sticky tires (RE-71RS), E50, and 465whp'ish aren't helping.

Add to that setting a PB right beforehand (1:19.8) which I think is the fastest non-slick tire M2 time to date. Only a few tenths behind the slicks times, with an easy additional 1-sec to pick up from a couple mistakes and if had fresh rubber. So, the car was moving!

A thought that popped into my head is if any of the upgraded LPFP's that E30-85 guys are running would be a solution? Based on BW's description, I'm not sure an upgraded LPFP would fix fuel starvation on track?
https://www.bimmerworld.com/Intake-F...AaAs91EALw_wcB

If not, are you guys still experiencing the fuel tank level and vent/overflow issues when using the BW kit?

Also, bc I’ve already installed the Dinan LPFP mod, would I have to start over with a new pump anyways for the BW kit to fit & work correctly? https://documents.dinancars.com/r420-0001.pdf

Thanks!

[ZM2]

What do you guys think, would an upgraded LPFP address fuel pick up issues? Only contemplating the higher flowing LPFP as a potential starvation fix bc I'm running E50 and my power level is getting close to the edge of the OEM LPFP flowrate.

https://precisionraceworks.com/produ...39318067445953

or,

https://www.bimmerworld.com/Intake-F...M3-M4-S55.html

UPDATE: I spoke to PR for a while and their suggestion is their Stg 2.5 pump and they’d incorporate their own version of the Dinan LPFP mod (without rubber lines) into their LPFP for just $50 more.

Seems like a pretty good way to go for track guys that are running tuned cars on ethanol that might need more fuel flow while also addressing fuel pickup issues.

Also have been getting a ton of input & feedback from johnung on the LPFP & EKP replacement. Maybe he can point us to a thread consolidating LPFP replacement for folks that decide to take this approach.

[AlexB77]

Originally Posted by GenXG87

Installed this last week. I decided to try this after taking the OG to Roebling Road and going into limp mode from fuel issues at 5/8 of a tank. Car is running a BM3 stage 1 tune but was stock suspension and tires that day.

Kit was pretty easy to install. Maybe 3 hours total time.

This kit is an auxiliary pump that is tethered to the jet pump line and pumps in to the fuel pump canister on the pass side. Not the most elegant solution but very cost effective and very good install instructions.

However I don’t recommend running this all the time. I pull the fuse for daily use and put it in on the track. Why? Well a couple reasons. This thing does mess with the fuel level reading. Most likely because it pumps way more fuel into pass side than is needed. The second thing is it seems to cause fuel vapor/overflow out of what I think is a tank pressure relief valve on the passenger side. This only happens when the fuse is in and the pump is running.

Here’s the good thing. Ran the car on 200TW rubber at Road Atlanta with peak G going from 0.99 at Roebling to 1.18

Ran the car to 2.5 gallons left in tank and never had an issue with limp mode or even a hiccup in performance.

That’s a very cost effective win.

I’m thinking a pump controller added to it that links into the fuel level sender would be a good way to install and forget it. Maybe I’ll program an Arduino as a home project. 😆

Love that this works! Is the fuse easily accessible?

[GenXG87]

[QUOTE=AlexB77;31029879]Love that this works! Is the fuse easily accessible?

Yes. It’s the fuse panel under the cover in the trunk.

[OG Shark]

Looks like this will be a decent solution if your fuel requirements and/or lat g combination is not fairly high. For the price it is an excellent option to try and see if it fulfills your needs but there are cars out there that will still need further work to eliminate the starvation. Not sure where that cutoff is yet - that is going to be interesting to find out. I can say that on the S55 - upgraded lpfp (Precision Raceworks Stage 3 Brushless) and Dorch hpfp lift kit running full e85 and this kit will not cure the starvation. I'm not a fan of running an external surge tank on a street car but that is the road we are having to go down right now.

For those that are having success with this kit it would be helpful if you give an idea of your HP, lat g's/grip level/tires/etc, fuel type/levels - all that fun stuff - so that we all can start to see the range this helps in.

[GenXG87]

Running RE-71RS 275f 295r
Stock suspension
BM3 stage 1

My thoughts are there are various fueling issues. Issue 1 is getting fuel to the LPFP. If the bucket doesn’t have fuel the best pump in the world won’t matter since it will suck air. IMO the fix kit will address that. Now the question is how long can you sustain high Gs before the fix kit pump can no longer supply enough to the bucket.

Then there is LPFP capacity. Cars running an ethanol mix and high hp need that. Even if the bucket is full the pump needs to have enough flow.

Seems like a surge tank is the way to go but for a street car nope.

Someone needs to make a drop in aftermarket tank with dual dumps, dual pumps and a balance tube and of course some foam.

[ZM2]

Originally Posted by OG Shark

Looks like this will be a decent solution if your fuel requirements and/or lat g combination is not fairly high. For the price it is an excellent option to try and see if it fulfills your needs but there are cars out there that will still need further work to eliminate the starvation. Not sure where that cutoff is yet - that is going to be interesting to find out. I can say that on the S55 - upgraded lpfp (Precision Raceworks Stage 3 Brushless) and Dorch hpfp lift kit running full e85 and this kit will not cure the starvation. I'm not a fan of running an external surge tank on a street car but that is the road we are having to go down right now.

For those that are having success with this kit it would be helpful if you give an idea of your HP, lat g's/grip level/tires/etc, fuel type/levels - all that fun stuff - so that we all can start to see the range this helps in.

That’s why I’m looking at the PR pump with Dinan like mod. Seems like both issues need to be addressed.

470whp
E50
-1.31g decel, 1.29g lateral on my last outing with 71RS

Haven’t had issues with my stock LPFP with Dinan mod until now that the power and grip level is slightly higher.

[M2guru]

Last year with the Dinan kit:

- 1.26 g
- ~380hp
- 71RS
- 93 octane

Fuel gauge looked like this at the 1.26 g mark (no fueling issues at this point):

[F87source]

Im not sure how well this would work or if it could be implemented given our offset fuel pump. But this could be a potential solution that works better than foam:

https://www.holley.com/products/fuel_systems/hydramat/

[medphysdave]

Originally Posted by F87source

Im not sure how well this would work or if it could be implemented given our offset fuel pump. But this could be a potential solution that works better than foam:

https://www.holley.com/products/fuel_systems/hydramat/

That's an interesting idea. If Holley created it I'd imagine there is no issue with sucking in enough fuel.

[Track/S]

Originally Posted by F87source

Im not sure how well this would work or if it could be implemented given our offset fuel pump. But this could be a potential solution that works better than foam:

https://www.holley.com/products/fuel_systems/hydramat/

The best thing I've seen so far.

[F87source]

Originally Posted by Track/S

The best thing I've seen so far.

Yeah I agree, I've seen it since early 2016 iirc and was talking to fuel it about potentially integrating it on our car but I don't remember why they didn't ever do it.

But I do suspect a few issues of trying to run this:

1) our fuel pump is on one side of the tank, this means you have to run one really long hydramat to get to the other side of the tank. I don't think they sell a version where the pump connector is far enough to one side that it'll fit in the tank without curling up all over the place where the fuel pump sits. Since these things are either sold as a Tee or a really long rectangle with the pump in the middle (meaning alot of excess on one side).

2) I don't know if they sell a hydra mat long enough to even fit our massive fuel tanks, these are more for small square race fuel cells.


3) we will have to get rid of our bucket for the LPFP to make this work. So that'll require a bit of work but probably not too bad. I'm not sure how the jet pump will be retained either with this hydra mat.


4) I don't know if this hydra mat allows enough fuel flow when sucking fuel from across the tank, and partially exposed to air.



There's a lot of unknowns but hopefully someone in the m2 community takes a gamble and tries it out.