[straty]

Hi i am currently building up my GTI conversion. Ive done some research in terms of fuel system and bought the components that will make it work i think.
This is what i have.
Surge Tank: http://cgi.ebay.com.au/undercar-ally-su ... 4cf35002ed

Hi pressure pump: http://cgi.ebay.com.au/WALBRO-GSL-392-2 ... 3362763213

Circ Pump: http://cgi.ebay.com.au/UNIVERSAL-ROTARY ... 20b1a7dc0f

What i would like to know from youse is if this setup i have attched will work or whether i am better off routing the lines different Cheers
Jonny

[Fatzook]

looks good to me.

[bagnkat]

Plumbing is correct. I've used the surge tank you've shown - the quality is very good. It and the fuel hoses are susceptible to damage under the car though. Don't know about the pumps, I used a VL pump for pressure and a cheapy 'clicky' transfer pump from Supercheap.

[straty]

ok so i dont need to weld a return fitting onto the main tank i take it ?

[bagnkat]

No, return will be into the tank via the normal return.

[straty]

err i dont think there is a return, as in i dont see why a carby would need a return ?

[Fatzook]

It has 3 barbs up top.

Fuel return
Fuel overflow
Fuel inlet.

Also has a 1/2 at the bottom for fuel outlet. The surge tank is fine.

Just run the overflow from the surge tank to the factory return line on the fuel tank.

[Fatzook]

straty wrote:

err i dont think there is a return, as in i dont see why a carby would need a return ?

Have a look on your chassis rail. There are two lines connected to the motor. Both are fuel. 1 is return.

[straty]

ok so there is a return line plumbed ito the main tank then ?
sorry for all the questions lol

[bagnkat]

Something else to think about: The bloke that makes those surge tanks makes smaller ones too. If I was doing it again I would probably consider a smaller one to put it somewhere safer. While the surge tank itself might be okay, it would suck to have a stick snag your fuel lines feeding it. I'd probably get the square cross-section one he does as the fuel lines don't exit on an arc like the round one does. That way the fuel lines will be tight and less likely to look like a bird's nest.

[straty]

ok thanks for the advice cheers

[bagnkat]

straty wrote:

ok so there is a return line plumbed ito the main tank then ?
sorry for all the questions lol

Yes, it's a return from the carby bowl. The mechanical fuel pump constantly tries to fill the carby bowl at a higher rate then the engine will use, essentially the surge tank carries out the same function as a carby bowl.

[straty]

ah ok it all makes sense now cheers

[mightymouse]

Just a thought you could try a volvo injected pump and surge tank it is in one unit and works well supplying a big block so should have little problem with a suzuki

[sleeperzook]

The inlets to the surge are on angles to the round body to create a swirling tornado effect in the tank, this forces air bubbles to the top and they exit via the return to the main tank and vent. The last thing you want with an efi set up is air bubbles and leaning, especially if you ever go the boost path. As for vessel size, it doesn't have to be massive. To give you an idea gti injectors flow around 270cc/min and you'll never use 100% injector cycle. So in theory a tiny 1L surge will protect you for atleast a good 20seconds of total lift pump cavitation or starvation at full noise. As someone alredy mentioned protecting your fuel lines is obviously a good idea though.

[mnemonix]

I use a 1litre surge tank off the same seller. It's worked great for my setup.

Add a low pressure fuel filter in the blue line prior to the lift pump.
Make sure this pump is mounted as close to the fuel tank as possible so it is not pushing & pulling simultaneously.

Add a high pressure fuel filter in the green line prior to the walbro pump.

Make sure your fuel return from surge tank uses the highest fitting on the surge tank (so that the surge tank remains full) and returns to the fuel tank above the 100% full level so that there is less resistance for return fuel. (You should be able to blow into the fuel tank and not make bubbles).

You'll also find your tank has more than just 2 fittings (fuel in/out).
It will also have breather/carbon cannister etc. These need to remain in place.