surge tank set up.

[ed]

we all know the lengths these guys go to in not only the fuel system but every aspect of the car...

thats the basic priciple i work on when i modify anything on my car

think of the consequences of fuel starve, then think of the effort of putting in a slightly better lift pump and tank...

[4SFED]

think of the consequences of fuel starve, then think of the effort of putting in a slightly better lift pump and tank...

Couldnt agree more. Do it once and do it right!

[Vios-GT_07]

there's a lot of mixed opinions on this..

but yea i'm in the process of getting a surge tank fitted to my track car (which leans out under extremely hard cornering)..

i'd just like some feedback if possible, and i've got a few opinions on this but i'd just like to put it out on the floor to see what other people think

i'll be running the stock efi fuel pump to fill up the surge tank, and a Walbro GSS342 to pump fuel from the surge tank to the engine.. i don't have a return line, so i'll just run the overflow line from the surge tank back to the main tank..

is there any issue running this way?

also, any tips on wiring up this fuel system would be much appreciated.. i've searched and found a few ways but nothing specific yet..

[The Real Roadrunner]

there's a lot of mixed opinions on this..
i'll be running the stock efi fuel pump to fill up the surge tank, and a Walbro GSS342 to pump fuel from the surge tank to the engine.. i don't have a return line, so i'll just run the overflow line from the surge tank back to the main tank..

is there any issue running this way?

idealy it would be better to run a return but ill admit it would be a pain in the butt.
there shouldnt be any probs with that setup but please make sure that the walbro will supply the amount of fuel you need with the high pressure nonreturn systems run.
also you will have to put a tee in the feed line after the pump with some sort of FPR to return back to top of surge as you will need to be able to set the base FP somewhere.

cheers
linden

[Vios-GT_07]

the walbro is a much more powerful pump than the stock item.. 255 liters per hour? and yea the pressure is definitely higher than stock.. a lot of people i know run the walbro in-tank, so yea the system is fine for it..

please elaborate on running a FPR to returnb ack to the top of the surge

also, any issue with running the walbro externally? everyone i know who runs a walbro 342 seems to have it internal of the main fuel tank..

[The Real Roadrunner]

well if you put a surge in with a new efi pump and the system is nonreturn you have to bleed pres off from some point to get the desired base fuel pres otherwise you could have 200psi+ @ the injectors
so what you would do is put a T in between the new external pump and hardline that runs to the injectors and fit a FPR there to bleed the pres off, the fuel that is bled off you would then run back to the top of the surge.
a returnless system would have a FPR in the tank and just dump back down to the pickup.
cheers
linden

[Vios-GT_07]

ahh okay i got you the FPR is that device with a little gauge on it yes? shouldn't be hard to source and setup.. i might just measure what pressure the car's running now, and just set the FPR accordingly

issue is now, how to wire the pumps up, and is there any issue with running the walbro externally?

[The Real Roadrunner]

never ran a walbro externaly as i prefer bosch pumps but each to there own.
just run a fused feed wire from the battery through a relay to the pump and use the orig fuel pump wire as a trigger (teed off, dont cut) for the relay. easy as that.
cheers
linden

[Fish]

i was contemplating running a regulator after rail. so that the injectors got the right pressure at the rail instead of a restriction further down.

[The Real Roadrunner]

i was contemplating running a regulator after rail. so that the injectors got the right pressure at the rail instead of a restriction further down.

i was talking about a nonreturn setup. they dont give you the option.

[twentyEight]

Ok, I did a quick measurement of my surge tank and I figured it's about a 600-650ml surge tank (depending on the thickness of the alloy used) and I want to know if this is large enough...

I will be running a 3S-GTE with 550cc injectors and I will be using the car on the track as well as the street...

In my opinion, this won't be big enough and would be thinking a 1-1.5L surge tank would be better... I would like to hear your opinions...

[Vios-GT_07]

^^

me thinks, if you got a regulator at the fuel rain and a return setup... and if you drag the car, it won't be big enough ... i'm still new to this but the way i see it, if you run WOT for about 15 seconds or so the tank will drain empty?

track work and street would be ok as you'd rarely ever hit WOT for more than 5 seconds?

[twentyEight]

Hopefully I won't be running for 15 seconds when I drag it... If I'm going to run 15 sec 1/4s, this whole RWD 3S-GTE thing would be useless...

[EVOSTi]

i was told today by a guy who does a bit of performance work that the ideal size of the surge tank is the same as the amount of fuel your pumps flow per minute? i think thats what he said anyway.

[twentyEight]

So a Walbro 255lph pump would require a 4.25 litre surge tank???

I don't think so!