Fuel Starvation Control Product

martin82

Lol then I will buy urs spohn! Hand me down parts!!

SPOHN

I still keep the surge can setup. It will just have a return fuel setup added to it. Along with two fuel pumps.

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SS_Firehawk

I definitely have some interest. Wife and I intend to use the $20k+ that's now sunk into the Z. We both will be taking some lessons and getting some track time with it. I got fuel starvation on a right hander beating a light with 4-5 dots left. It took about 4-5 miles for the fuel gauge to read correctly again. I'm trying to squash any known issues this car has. Mine is SC'd and using Walboro255LPH already. I'm supposed to be around 500whp, but no numbers as GTM's still finishing things up.

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DR_

Found out from a student I had that the Mustang Boss has a similar issue with 3/4 tank. That made me feel a little better about the Z.

shadoquad

Really! That's wild!

Nonetheless, seems like phunk has the solution for z's

Baer383

The only cure for the problem is to buy a Z06 vette preferably blue.

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2013 ZL1

754 rwhp 747 rwtq

Alstann

A simple tee wouldn't work - as soon as one starts sucking up vapors, the "seal" in the line is broken, and the pump will only try to suck from the vapor side. Path of least resistance, if you will.

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synolimit

I thought about that but there is a siphon on the drivers side of the tank. And since the fuel starve only happens on a right hand turn, that siphon never goes dry (which blows me away because from the pics it looks like left hand turns should fuel starve). if you tee'd into that siphon and ran a line to the passenger side and kept it low to the floor just like the hard line I'm talking about, I'd find it hard to believe the passenger side of the tank goes 100% dry with a line touching the floor. I don't know, I guess I have to pull it apart because I can't see why right hand turns are the issue, seems like lefts would be.

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13 370z-

wstar

On the stock system the pump is in the passenger (right) side, and yes there's a simple crossover tube to the left (driver) side that tries to slowly level out the two. When you take a long hard right-hander, all the fuel goes to the left (driver) side, away from the pump, and that little crossover balancing tube really can't do anything about that. It will slowly level the two sides when there's no significant side load on the car, but it can't go against the g-force (or supply enough fuel to keep the pump running regardless).

Even after having seen it up close and installed it (twice!), I still don't fully understand Phunk's system, but it's complicated and it seems to work in all conditions, so I don't care how it works as long as it works

It puts a surge can and secondary pump in the driver's side, and runs 3 hoses back and forth between that and the factory pump on the passenger's side, and also involves some modifications to the internal hoses on the factory pump module (which also has a very small reservoir area). Others have backyard-engineered other systems with other tradeoffs (including pumps with pickups in the all the corners of the tank, cutting the tank in half so there's nowhere to hide the fuel from the pump at, etc. I'm sure you can make something else work cheaply if you want, but there's always tradeoffs...

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7AT Track Car!
Journal thread / Car setup details

synolimit

I saw the cut tank, haha that's cool! I wanna pull the pump to also see if anythings changed from the pics I've seen. With me finding so many changes on the 13 I would love to know I don't have this problems. Only plus g's I've done so far were on a full tank so...

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13 370z-

clintfocus

^i think if it was this simple, Phunk wouldve figured that out

synolimit

Never hurts to ask and find out yourself. Companies make and sell stuff all the time and a back yard mechanic comes along and fixes something for $5 with duct tape, a Qtip, and a bag of marbles who else bought a OEM tank and cut it up?

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13 370z-

phunk

part numbers of the 2013 fuel tank and fuel sending unit match previous years parts.

what changes have you found in the 2013?

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phunk

the thing you need to realize about the factory siphon in the tank, is that it is a venturi that is created from return fuel pressure. when you slosh the fuel to the left of the tank in a right turn, the fuel pump starves, there is no fuel at all coming through the regulator because the regulator is not allowing any bypass below its fuel pressure setting. therefore you have no return fuel to operate the venturi, and the factory over-tank siphon is dead, and will not function again until the system is up to full fuel pressure.

this is why when some of us make a hard and long enough right hand turn below a half tank, our cars are literally stranded on the side of the road until we add fuel to the tank. because no matter how long you sit there and wait, that siphon is not going to work without full fuel pressure.

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Coyote

I'm also interested.
I'll post that on the french forum and see if some people are interested over there as well.