Jon_Valjean

Hey all,

Just returned from my sisters b/f's house where I've been re-installing the rear axle on his '79 SA. During this process, we removed the Holley Blue fuel pump (had to cut the lines, still washing the taste of 98 unleaded out of my mouth..) and I realised that this is one of the issues I hadn't considered with my 13B-T swap into my '81 GS. I've spent the better half of an hour searching the forums for the best suggestions, but I've still come up across the following hurdles:

1) Can the stock fuel tank supply enough fuel through the standard fuel lines for a 13B-T engine with 2x 550cc and 2x 1600cc injectors? Do I need to modify the tank pickup lines? If so, how should this be achieved?

2) Bosch - are these the best pumps to get? Does anyone have a product number for this type of application? I'm looking at 400RWHP.

3) Electrical supply - a pump of the capacity I require should be relayed and using a dedicated power supply. Correct?

4) Swirl pots - can anyone speak from experience as to the technical requirements behind a 3-4 litre (0.8 - 1.0 imp. gallon) "swirl pot" for pickup on a fuel injected system. Where did you mount it? What does it look like?

Thanks for any help at all

81Rex6port13b

you can pick up a walbro 255 inline pump for around $130 on there site they say they can suport up to 700HP

and 1600 CC secondaries? is the motor ported? and how big of a turbo are you going to run. thats a lot of fuel

MarkPerez

the pick ups in the tank are fine. if you want a better fuel flow replace the hard fuel lines with braided stainless steel lines and start thinking about a surge tank add-on. you don't need to go crazy about the pumps but,, you need to consider, porting, size turbo, and street or track ? remember there will be a fuel presure regulator too so even if you buy a huge fuel pump the turboII ECU will only allow so much presure.
that is if you use an -SE gas tank, if not you'll need to get one.

81Rex6port13b

would you need to get an SE tank? or can you use a 12a tank with aftermarket fuel pump and a fuel pressure regulator?

frode

The SE tank has some baffels around the fuel pickup, so it should be fine without a swirl pot or catch can. With the standard 12A tank I would run a swirl pot. FYI Steve (AJC13B) made over 500 RWHP with stock hard fuel lines, 12A tank and a swirl pot. So thats a setup that works.

I'll be running Bosch pumps myself.

81Rex6port13b

excuse my ignorance... but what is a swirl pot?

im planning on running the stock 12a tank on my turbo II swap... so this is new to me. i was told i can just put on an aftermarket fuel pump made for FI (replace the holly i have on now witch is also inline) and run a fuel regulator and i would be fine.

frode

Sorry, I wrote catch can above! Meant to write Surge Tank!!


It's the same as a Surge Tank. It acts as a bubble trap for the fuel.

http://www.sdsefi.com/techsurge.htm
http://toyotaperformance.com/surge_tank.htm

RotaryRevn

I was once told that Bosch makes a fuel pump that is a direct bolt in for the gslse, Is this true?

Turbo95Max

iTrader: (4)

does any one know how i can install an aftermarked fuel level gage on a gs tank...i going with auto meter...can i use the stock fuel level sender or do i need the autometer one..if so how can i mount it...i am also doing a 13bt swap into a gs and do out of tank fuel pumps pump as much as in tank ones i heard that you generally use out of tank for low pressure carbs and in tank for efi...what size fuel lines should i run?

Jon_Valjean

Thanks dude, that's a pretty good price. Has anyone had experience with these pumps?

The motor is extensively ported, has been dowelled and the ecc. shaft x-drilled. Microtech ECU & S5 ignitors will control fuel and ignition, and although I haven't settled on a turbo package entirely it will be a very similar setup to AJC13B's but probably won't run more than 15-16psi as this will be street-legal (God bless our lack of emission regulations and a slack approach to vehicle certification).

I won't be able to get an SE tank unless I get it imported from the states (expensive) as the SE was never sold in NZ and I've certainly never seen one. A swirl-pot seems the logical solution, does anyone have any pictures of one mounted? There's not a lot of room under the back of these things, and I'm curious as to where it would be mounted.

Thanks for the rest of the information, it's a relief that I won't have to have the tank welded or custom lines made, but I think I'll definately go with the braided lines between the pump, filter, swirl pot and hard lines.

MarkPerez

If you want to run a drop-in pump, like 2ed gens use,
on a 1st gen. you'll need an -SE tank. -SE's tanks have a 'plate' that screws on to the tank, thats where the fuel main line,return line, and a vent line to the check valve are. theres really no difference, drop-in, or in-line
pumps. as long as it works. the car won't know the difference. the hard lines on a 12a car gas tank is way smaller then an 13b (gsl-se) cars gas tank. theres only one piece of metal. some will call it a baffle in the center of the gas tanks, but i call it more of a 'brace' really, it's not drilled or anything. or one could get 'sick' and use a 12a tank, cut it and do whatever to make it able for a drop-in pump/larger lines