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Old 04-29-2013, 12:37 PM   #1
dcramer
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e36 fuel starvation solutions

With the new S50B32 and the new asphalt at Mosport I now experience fuel starvation between 3 and 4.

A little bit of googling suggests that pre-96 this was not a problem as there was a pickup in the left tank as well as the right. My guess is some bean counter figured this wasn't really necessary and they switched to a single pickup.

There are a few kits out there with dual fuel pumps, and one which is just the pre-96 setup.

The question is: is the pre-96 setup good enough ? I dislike the complexity of 2 fuel pumps even though it is actually cheaper at bimmerworld.

Dave
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Old 04-29-2013, 01:01 PM   #2
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I have never had a problem at the track, even at 1/4 tank. My friends 97 cant go below a 1/3rd tank before it starts having starvation problems.

That said, I still would never go below a 1/4 tank.
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Old 04-29-2013, 01:29 PM   #3
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It might have something to do with driving style too.

I don't starve through 8 but my foot isn't in it like between 3 and 4
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Old 04-29-2013, 01:51 PM   #4
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lol. I thought you might bring that up.

We both have plenty of track time, formal training, and our lap times are very similar.

That said. If you are spending a lot of time at the track, why not just go for the extra pump. Perhaps someone can chime in who has it done. They aren’t all that complicated and I have heard nothing but good things from those who have done it.
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Old 04-29-2013, 01:55 PM   #5
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Well if I just don't accelerate as hard between 3 and 4 it's fine, plus this didn't happen at all with the S52. I am curious why it seems to happen to some cars and not others, I wonder if the siphon tubes get dislodged or something.

I am considering the dual pumps, but I'm cheap. Course my penny pinching may cost me a motor if I'm not careful
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Old 04-29-2013, 02:10 PM   #6
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This happens to ALL e36's 96+ no questions asked. On my E36 M3 trackcar, I first tried the older system from the 92-95 and it still starved! Between 3 and 4 just like you. Usually around 1/2 a tank.

It wasn't until I put a second pump in the driver side until the problem was solved and I could run until empty.

Here are some solutions. Don't skimp, just go straight for the dual pump setup. It's really easy to install too!

For $320 you can't really go wrong.

http://store.bimmerworld.com/e36-fue...-kits-p39.aspx

http://store.vacmotorsports.com/vac-...-kit-p562.aspx
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Old 04-29-2013, 02:11 PM   #7
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that's all I wanted to know,

Thanks!
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Old 04-29-2013, 02:18 PM   #8
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Even better, someone on the forum is selling a kit!

http://maxbimmer.com/forums/showthread.php?t=157311
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Old 04-29-2013, 02:56 PM   #9
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How lucky is that...thx
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Old 04-29-2013, 03:46 PM   #10
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how are you enjoying the swap?
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Old 04-29-2013, 03:55 PM   #11
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Loving it. 250 miles on Friday, not a drop of oil used.

Found a small coolant leak Saturday when I looked in the garage. The plastic line for bleeding the rad is supposed to have a brass insert, the heat from the rad shrank the tubing under the clamp.

thank god for the new asphalt as I was into turns a "wee" bit faster than I thought I was.

Buddy has a cayman R, I was able to pull away from him above 100MPH
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Old 04-30-2013, 09:40 AM   #12
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oh thats sweet. It definitely is a different experience especially above 90ish mph. It just keeps pulling. Feels great on the back straight at mosport.

Maybe one day I can get to a swap like that (or s54).
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Old 04-30-2013, 09:48 AM   #13
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So actually it was a cayman S, but still.

Ya the motor is completely smooth, no vanos kick. Little strange bouncing off the rev limiter between 3 and 4. Will take a bit of getting used to.
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Old 04-30-2013, 09:53 AM   #14
NOTORIOUS VR
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For that amount of money, I would do a surge tank instead.

I'm going to have to look into this issue as well, definitely cannot afford to starve the motor under boost.
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Old 05-01-2013, 02:35 PM   #15
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I had the same issue with my E46 - '01 330i. Not sure about E46 tank setup vs. E36, but replacing the fuel filter solved my fuel starvation issues between turns 3 & 4 at Mosport.
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