Fuel starvation, who else?

ChrisSlicks

Yes. I've had it occur on the street with 1/4 tank on an uphill right hander driven aggressively. On a flat auto-x circuit it happens fairly consistently at 1/2 tank with long radius right handlers.

The combination of turning right and climbing seems to be the worst for pushing fuel away from the pick-up. Not very common on the street as it requires sustained lateral G's and heavy throttle.

ban25

How do you think it would react to driving up or down a street with a grade between 25 and 30%?

ChrisSlicks

As long as you're not trying to re-create any movie scenes by accelerating full throttle up the hill as you fly over the cross roads I think you'll be just fine. And just to be safe fill the tank before it reaches 1/4.

ban25

Nah, wrong car for that. Ok, thanks!

JB-370z

This happend to me at the track when I was drifting. BAM the car shuts off with about a quarter tank. It happend to me on a left turn. The car started right back up. Scared th holly hell outa me. What can I buy to fix this issue??

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teejnut

Saw this problem at Willow Springs (Big Track) after the #2 sweeper. The throttle would not respond, started happening when I had less then 3/5 of a tank.

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B1nks

Anyone know if someone is working on a replacement tank with better baffling or something for this issue ?

Valentino

fuel system upgrades

it's been 20 days since he last updated his thread.

I would give him another 10 days before asking for updates, and maybe pictures (if possible).

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travisjb

this is a big priority and I'm surprised we don't have a vendor stepping up yet... four options

1. traditional external swirl pot
2. 'internal swirl pot' that was discussed here a couple mos ago
3. internal baffling
4. complete fuel system replacement, ie fuel cell, new pumps lines, etc

Option 4 may be necessary for those doing real racing or TT setups . Option 3 should be the cheapest but no idea how effective this will be when the tank gets low. I'm planning to give this a try. Basically a coffee can with holes that surrounds the fuel pump in the tank and partially resists flow away from the pump in corners. Option 2 should be the effective but more expensive and would require some engineering specific to this car.

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2009 370Z #104
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travisjb

darn, hadn't even seen that... will follow along, sounds like he's on the right track

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2009 370Z #104
*For Sale*

B1nks

I have plans for TT, though a full build will take some time, so I hope my only option is #4 but for #1, would it fit in my spare tire area ? I don't plan on putting a sub in so that's a possibility. I wish #3 would work and the thing with the coffee can would it resist both ways really ? What I mean is, if it kept the fuel from flowing away from the pump wouldn't it also partially resist flow to the pump as well ?

PS: Thanks for the link Valentino !

travisjb

yes, but the idea is that there are extended periods of time between lateral loading where it could fill back up... and you could also pattern the holes so that it resists flow out more than flow in... imagine the angle of the fuel in a hard right hand corner vs straight line braking / accel

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2009 370Z #104
*For Sale*

pgrmstr

I think I experienced this for the first time this weekend at an autox. Oil temps were starting off at 220 before my run, but were 245 at the end of the run. I was getting some momentary "cut outs" mid way through the course and was thinking it was limp mode, but having read this post this morning, pretty sure I was getting fuel starvation. The point of cutout was at the turn around of the course, a sweeping uphill right hander...and it cut out on two separate runs in the same place. I was running about 1/2 tank of fuel so looks like people are getting starvation even between 1/2 and 3/4 so looks like I'll need to run 3/4 to full to be safe.

That's a fair amount of extra weight to have though...

travisjb

exactly... this will be the best weight reduction mod we can make, once we solve it

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2009 370Z #104
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import111

Anyone have new news on this subject?