Austrian Vette

Anyone knows if....and how....I can get the C5īs fuel system working with a non stock ECU (Motec).
I have not looked deeper into how the fuel system works (pumping from one to the other tank, fuel level gauge,.......), yet, but maybe anyone did and can help me on that so I can save lot of searching time.


Also, is there a plug and play fuel pump setup for about 750hp NA existing (plug and play?) for the stock fuel tanks?
Want an intank setup with a single pump.


I highly appreciate every info you have for me.

lucky131969

I'm not familiar with a Motec PCM, but if it is not capable of communicating via the class 2 serial buss, getting the fuel pump to run.....is the least of your problems.

Austrian Vette

The car gets completely new wiring (racecar).

lucky131969

So to be clear, you will not use the factory ignition(key) switch?

Austrian Vette

no I will not

I need to know if the rear fuel system kinda works without an ECU (knowing when the one tank is empty and pumping from one to the other, fuel level gauge....) or if it needs an ECU to work.
If it kinda works "stand allone", it should not be a problem to get it to work with a Motec or any other stand allone ECU.

lucky131969

Do you plan on using a factory type throttle body? If so, this communicates via the class 2 with the PCM and TAC as well.

Austrian Vette

I have an ITB setup, using drive by wire.

What does that have to do with how the fuel tank setup works?

lucky131969

Ok, you have provided zero information about your proposed setup, so I'm just trying to gather information to help. It sounds like that is a problem, so perhaps someone more knowledgeable can help you.

Good luck

Austrian Vette

Itīs something that not everyone has to think about, when modding his Vette.
Itīs pretty special, I know.

Thanks for trying to help!

Hopefully someone knows how all that works, or thereīs a LOT of googling and forums searching for me ...

lucky131969

Yes, I'm sure there is someone on this forum that understands the electronics in depth....someone that understands schematics in detail, and can provide you with exactly what you need.

VGLNTE1

All you need is a fuel pump to support that power...hell I have 600 and use the stocker

Austrian Vette

But that seems not be too easy.

The walbro 255l is not enough and I donīt want a dual pump setup.

I have not yet found a single pump stup for the C5 that flows enough for 750hp.

Found one for 1000hp plus turbo setups, with boost regulated parts, but thatīs too much.


Still need to know i fthe fuel system itself will work without the stock ECU.

VGLNTE1

ligenfelter makes a pump....I know plenty making 600+ at the rear wheels NA with it..do you mean 750 at the crank? what set up are you running?

Austrian Vette

yes, around 750 at the crank.
built 7 Liter LS2 with ITB setup

The lingenfelter is not enough.
I need something that can do the 750 easy without beeing maxed out.

Z0600

Why are you set on not boosting a pump? If you are then you will probably have to go to a dual in tank or make a single with a bigger pump or go external. Why an in tank if it's a race car?

98vettedave

Your actually only talking about approximately 640 rwhp. The Racetronix fuel pump-hot wire (plug and play) coupled with a boost-a- pump and a return fuel system (97/98 vette) will support 700 rwhp. Without the return fuel system it's still good for 650 rwhp. Just curious...how are you generating 640 rwhp n/a? Please list mods.

Austrian Vette

Intank is the cleanest way to do it.
Doing an external pump will completely mess with the dual tank setup.
And I want to keep the stock tanks for sure....itīs the best location.

I donīt like boosting pumps as they then run with more voltage than they are buit for.
Thatīs no problem for a FI car that sees high fuel demand for a short time...itīs different when needing it permanent.

Austrian Vette

built 7 Liter LS2 engine with harrop ITB setup.

I know the Racetronix setup, use it on a FI car, but donīt want to use it (would need to voltage boost the pump) on my road race car.

Z0600

I would get on the phone with kenne bell and see what they recommend because I'm pretty sure the boost a pumps are for all race applications not just drag racing( short burst of boost as you say). And I know that I've seen road course cars running boost a pumps and that is your only option for a single pump unless you install a aeromotive or similar pump in the factory basket. I would just do two walbros if you are set on not upping voltage.

98vettedave

Boost-a-pumps can be activated independently from the main fuel system (pump)that is constantly in service. There are guy's that activate their boost-a-pump via a toggle switch. Your fuel requirements can easily be accommodated by a Racetronix fuel pump until you go WOT,that's when the boost-a-pump needs to be put into service. So how do you figure that you have such a constantly large fuel requirement,is this a road racing engine? If not then the previously mentioned set up in post #16 will suffice.

Edit; I just read in an additional post that you are a road racer...I'm not sure how reliable boost-a-pumps are under those conditions.

Could you be more specific about your mods....tell us about your set up from top to bottom...thanks.