Fuel Starvation Control Product

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

Rusty

Couldn't of said it better!. Happy with mine too!

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浪人 - 殺し屋
"The Difficult Anytime, The Impossible By Appointment Only"
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ChrisSlicks

In +1

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synolimit

Ahh thanks.

Wouldn't it be easier to just Tee a line in the tank so the pick up sucks from both sides at the same time? When turning right the one line goes dry but the others still submerged in fuel sucking it up? Or external sump that's always being filled and where the engine pulls from. I found the install, looks like a lot of work.

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13 370z-

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-

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-

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-

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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phunk

the standard kit as it has been sold, i would rate for 500-550rwhp turbocharged, and less for supercharged cars. Beyond that, we are talking about custom installation and setup kits for the order. a second fuel pump will have to be installed into the secondary fuel pump slot, and some changes need to be made to plumbing, and an activation system for the secondary pump needs to be setup.

my ratings might be conservative, its hard to say. if you are able to get by on a walbro 255 now, you probably will be able to with my standard kit. its just that my standard kit isnt going to utilize its pump quite as effectively due to extra plumbing length. i also have reason to believe that the special model walbro 255 we use could possibly have a slightly lower power rating than a typical 255 due to it having secondary functions that leach from the overall volume output.

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