Fuel surge tank

[Otto347]

I was going to install a fuel cell in my 240 but with it being a hatchback I would have to build some sort of separator/firewall between it and the hatch. I decided to use the stock tank and make a surge tank and wanted to put the surge tank where the plate is in the hatch for the stock fuel lines and such. Would that be acceptable by most sanctioning bodys or would it have to have some sort of barrier between it and the interior?

[Def]

Why not stick it in the RR corner and build a little bulkhead/access panel for it? I believe fuel stuff in the cockpit typically needs a barrier.

[Otto347]

Thats a good idea, I might even try to fit it under/inbetween the right rear frame rail.

Thanks

[Matt93SE]

Yeah, if there's any sort of fuel tank or lines inside the cockpit, they have to have a metal cover over them.. If you can fit it inside the spare tire well, you could do that and just put a sheet metal cover of the tire well. If you can fit it under the car, that's even better. just make sure it's not going to drag bottom or get crushed if you go off or get hit in the corner. inside the frame rails and at least a foot inboard of the rear corner basically.

[CodyAce]

Call me crazy, but what sort of application are you running this on? I'd assume decently 'hardcore' to require a surge for fuel delivery

[Otto347]

'hardcore'

500hp S13 track car. It might not need it right off the bat but im going to build it anyway.

[Def]

Any build details? Sounds like fun.

Stock S13 tanks kind of suck... not quite as bad as unbaffled BMW tanks for starving, but I've noticed some as high as 3/8 or a little over. Typically means I have to fill up after lunch.

[CodyAce]

Any build details? Sounds like fun.

Stock S13 tanks kind of suck... not quite as bad as unbaffled BMW tanks for starving, but I've noticed some as high as 3/8 or a little over. Typically means I have to fill up after lunch.

Totatlly agree! I'd love to see this car

As for myself, I also fill up after lunch break as if I don't, the last session of the day I'll find myself at 1/4 tank and 'hiccuping' out of some hard corners.

[Geno]

Please post pictures. I've spent the last month researching this to no end. I'm in the same boat, and have been looking at different surge tanks online for a while trying to figure out how I want to go about setting this all up.

So far my idea has been to use the Mazworx swirl tank with -6an fittings, keeping the stock hardlines and running a single 044 pump.

If you're wondering about my setup its the following:
Powerlab TS manifold
GT3076R
HKS Step 3 272 cams on solid lash adjusters
ID 1000cc injectors
Mazworx intake manifold w/Q45TB
HKS DLI

all controlled by a Haltech P1000.

The current fuel pump in the car is from a R32 GT-R

[au-scooby]

heres mine to give you an idea.
used to starve bigtime with anything less than half a tank.
now i can run it hard right down to fuel light !



walbro inline pump..
since wrapped the lines in alum. foil to try and stop it stinking out the car.. still kinda does tho!

relay switches both pumps, with a fuse to the battery incase of any dramas !

cost a bit over 200 all up

[gawdzilla]

Any build details? Sounds like fun.

Stock S13 tanks kind of suck... not quite as bad as unbaffled BMW tanks for starving, but I've noticed some as high as 3/8 or a little over. Typically means I have to fill up after lunch.

s14 tank is similarly sucky. i've had fuel starve starting a session at about 1/2 tank. in hard corners i've seen the gauge visibly dip at least 1/4 tank. not sure if my fuel level sender is busted or what. but either way fuel starve has happened to me twice and it's scary/bad for the motor. i just top off after every session now... and end up needing to use at least 2 cc's since my cards start getting rejected by the 2nd day

[CodyAce]

s14 tank is similarly sucky. i've had fuel starve starting a session at about 1/2 tank. in hard corners i've seen the gauge visibly dip at least 1/4 tank. not sure if my fuel level sender is busted or what. but either way fuel starve has happened to me twice and it's scary/bad for the motor. i just top off after every session now... and end up needing to use at least 2 cc's since my cards start getting rejected by the 2nd day

Yup, as I said before, if it gets to quarter tank I fill up, as I have had it starve on track...first time I thought it was a coupler that blew, second time I knew better hehe.

[Otto347]

Any build details? Sounds like fun.

Yeah should be when it gets finished. Been working on it for almost 2 years now but the last 3 or 4 months ive been dead in the water. So much **** going on, im actually sick of looking at it and want to drive it now!

Small list of whats in it.
S13 hatch with all S14 suspensions parts.
2007 LS based 4.8 iron block engine
ARP rod bolts
LS6 heads and cam shaft
LS2 intake (need to get rid of that) LS9 throttle body
Single MPT70 96ar
RPM T-56 (might switch it out for a T-10/15 4 speed in the future)

Please post pictures.

I will, im also going to use the Bosch 044 fuel pump as the primary and the stock s13 for the surge tank. I was going to pick up the 044 this past weekend but my hardbody decided it wanted a new radiator so........

[Def]

I don't know if an S13 pump can flow 500 HP worth of fuel even at low pressure. You still have a pump's flow vs. pressure curve to deal with(more pressure = less flow). So even at almost zero pressure differential, I don't think the S13 pump is up for it. I'd think you'd still be looking at some sort of Walbro pump at a minimum.

[Otto347]

Will do, ill have to grab a walboro then. Thanks!