TurboIIGuy

Okay so I'm dropping in a TurboII motor into my 84. No big deal, just a stock rebuilt motor. But, what kind of fuel pump should I use. I'm not boosting anything insane, just 9 pounds. Injectors are stock, the stock intercooler is going to be front mounted, of yeah and of course I will be strapping on some fatter fuel lines under the car. So what's out there. I will be using the stock 1st gen fuel tank so I'm not going with anything like an in-tank fuel pump. Let em know what you guys think. Any links would be great. I did a search on here but couldn't find anything specific to what I am doing, maybe I overlooked something though.
Thanx

Brianhsval

You must have overlooked it, Carter (Walbro) 255lph.

RX7145

iTrader: (1)

I think for most low power (under 250hp) the MSD-2225 pump is a good option. I would't use any thing larger than a 5/16 supply line.

MSD pump: http://store.summitracing.com/defaul...+pump&x=9&y=10

Terrh

iTrader: (7)

if you're just running 9PSI, there's nothing wrong with the stock TII pump.
that's only like 1 PSI over stock S5 boost...
You could run the stock TII pump out of the tank, with just a bit of minor work, I think.

steve84GS TII

If your car isnt an SE,then your gonna need to make some sort of baffle to protect the fuel pickup inside the tank.The SE tank has it from the factory,but the 12A cars have an open pickup.Without a slosh baffle,below 1/3 full,the pickup will become uncovered during left turns and if your boosting at all,the instant lack of fuel pressure can kill your engine.Even if your just driving normal,its not fun having the car lurch and slam your head into the steering wheel.(ask me how I know!)

If you run an SE fuel tank,then just install an external EFI pump and your done.If you dont,the 12A tank is easy to convert to intank style pump.Its much quieter and easy to upgrade to an FD or Supra pump for later upgrades.The FC pump holder is exactly the right height and any good shop can weld the baffle and mounting rings into place.Just be sure to wash and rinse the tank out VERY thouroughly before any welding is done.

TurboIIGuy

Thanx Steve84GS, that sounds like a decent idea. Thanx again for the info, I'm going to look into that, the baffle mounting and the in-tank pump. I didn't want to go with an intank only because it involves more fabrication but I forgot to take into account fuel starvation under cornering.

Gregs

the GSL-SE pump will suffice, but the walbro 255lph pump is the best choice

TurboIIGuy

Is the GSL-se fuel pump really enough when you consider that it only has 2 fuel injectors when the TurboII and all 13b motors 1986 and newer have 4 injectors?

Jon_Valjean

It's not really about the number of injectors, it's about how much fuel the engine requires, and at what pressure.

Does anyone have any pictures of a 12A tank that has been modified for use with FI, and/or any kind of write-up about how it was achieved? I'm in the process of finding an engineering place to do this for me, and I'd appreciate any advice.

hondah8er

I would NOT ever use the stock SE pump for a turbo conversion. Do not listen to this guy!

Rex4Life

You can putt around town using the GSL-SE fuel pump, but once you start getting into any boost I would recommend the external Walbro 255. Look at my writeup and you'll see what I did--used the stock equipment and connections with the Walbro. I think I even put part #'s in the write-up. Works great and you won't have to worry about getting enough fuel. A benefit to my method is the stock PD at the fuel pump is retained. I also recommend changing the stock FPR since it may not be able to handle the flow from the Walbro.

Another thing is to definitely do the fuel pump re-wire that all the turbo 2nd gens do--the FB wiring will not be able to supply enough voltage to the Walbro (or any other bigger pump for that matter).

HTH,

Scott

p.s. Even at 9 psi the T2 pump is NOT recommended. Look over in the 2nd gen section and you'll see that a new pump along with the re-wire is one of the first recommended mods for higher than stock boost.

steve84GS TII

Yea,the TII pump is considered marginal for anything over an intake and downpipe.Youll notice most people recommend upgrading the pump before the injectrors.
The Walbro is loud but supplies plenty of fuel.I switched to an FD pump,then later a SupraTT pump.The latter is good to 400hp and totally silent.

The conversion to change the FB tank to an intank pump is not that hard.Yes it requires welding,and you may have to search to find a shop willing to weld inside a tank,but its not that complex.All the parts you need are found in a stock FC tank,any model.
The baffle box welds right on the floor of the tank,the mounting ring welds right to the top of the tank,where the stock feed lines go.The hole just has to be opened a little.
Then theres a little vent mounting ring that welds to the very top of the tank,the same way the other ring is mounted.
It must have been less than 2 hours work because it only cost me 175 bucks to have it done.If I had a TIG welder I would have done it myself.....

TurboIIGuy

Hmm.. I have never heard of changing the stock FC turbo fuel pump out for a larger flowing one when doing what seems like small mods to me, such as downpipe and upping the boost a couple of pounds. I know the stock FC pump is capable of producing up to 90 PSI without a regulator but I don't know what flow it has. Either way I think I am going to go ahead and use the Walbro, I have asked around and it seems to be the pump of choice. What about the stock fuel pressure regulator???? Can I not just use a new OEM piece??? What else is there to upgrade to that fits an FC fuel rail???? The only other FPR I have ever used and seen used is the Malpasi brand Fuel pressure regulator.

steve84GS TII

Im still running the stock FPR at 14psi of boost.More important than fuel pressure is volume.Bigger injectors/longer duty cycles will drain the system quicker.The pump needs to be able to flow enough volume to maintain 45-50psi in the fuel rails.Raising fuel pressure too much can actually reduce fuel delivery since the injectors have to struggle to open against the pressure.Its a good idea to utilize the stock fuel pump relay/resistor too.It will help raise fuel pressure when needed,but slows the pump and lowers the pressure at idle and cruise when fuel requirments are minimal.
If your only running 10-11psi I wouldnt worry about the FPR,however be very cautious with the pulsation dampers.The S4 dampers tend to pop their center screws and leak gas,resulting in a bad fire. The S5 fuel rails are a direct bolt in and cure this common problem.

Brianhsval

Se flow rate is like 28 gph,with 41psi. Figure the coversion from lph of the Carter 255lph pump, ( Walbro as some call it), is 68gph, 95psi shut off. The regulator from the SE is up to 71psi. So you can see that the SE stock pump is bearly enough.

RotaryRevn

I heard that the gslse pumps were designed around the bosch design and that a bosch pump would bolt right in? That's what Jeff at Rotary Power recommended to me to use for my t2 motor swap.

TurboIIGuy

Hey, I know Jeff from rotary power, it's in Gardena. Man the place looks alot better out there now that there' sconcrete on the lot, LoL
Well as for the fuel pump design I don't know much about the Bosch design but since the stock SE fuel pump just has two rubber hoses plugged in at each end I would imagine that it's pretty simple to stick "almost" any fuel pump in that area.


As for the FPD I know about the potential faulty operation and resulting fire that may come if using a S4 FPD. I read alot about that when I got my first TurboII a few years back, not to mention a lot of people asked me that when I would say I had just gotten the car, LOL.