cshaw07

iTrader: (14)

I want to turbo my 83 gs and i know you need a FI fuel pump and a regulator. My question is if I buy the FI pump and a regulator now, am I able to use it until I finish gathering parts to turbo my car? I know the stock pump sucks anyway, and i want to beef up my fuel now. Any problem with this? Using the stock lines?

sen2two

iTrader: (10)

this will not work.

Fuel injection pumps easily flow 40psi. your stock or aftermarket carb fuel pump will flow under 10psi. Really closer to 5psi depending on the pump. There is no way to regulate this down that far.

cshaw07

iTrader: (14)

then how do people us FI pumps on carb'd cars off boost? say at idle?

RX-7 Chris

iTrader: (19)

They don't. You will have to stick with a carb pump untill you go FI

PercentSevenC

What the heck are you guys talking about? I have my MSD EFI pump set at 4.25 PSI at idle and it holds there just fine, and it'll go lower if I want. All you need is a decent return-style FPR like the Mallory 4309. I used the stock 5/16" send line and a 5/16" return line that reduces to 1/4" at the tank.

rxtasy3

iTrader: (2)

answer to original question, yes. which ever regulator u use should allow u to get the pressure down enough for the carb ur using.

jgrewe

iTrader: (1)

I have a FI pump form a Ford truck on my FC(race car) Tons of pressure and volume and I found that I can hold 5psi with a Holley return style FPR. Funny thing is the 3/8" feed and return to the cell created about 3psi from the resistance.

I didn;t think it would work either but I wanted to be able to go back and forth from carb to EFI quickly at the dyno so I tried it. I use the stock FPR that is modified with a new top that is for a Honda when I run the EFI.

cshaw07

iTrader: (14)

even with the stock feed and return lines? Thank you so much

PercentSevenC

You MAY experience issues with the stock 1/4" hard return line, but give it a shot, it might not be a problem. If you can't get your fuel pressure low enough, just grab another stock send line (or the return line from a GSL-SE) and install it in place of the stock return and you should be fine.

Oh, and be sure to use EFI-rated soft fuel line for when you do go turbo.

nofords

iTrader: (9)

I've used EFI pumps on carbs many times.

I've been running a carbed SBC in my S-10 efi truck for years.

As stated above, with the correct regulator and appropriate fuel lines, go for it.

there is a word of truth about the larger PSI pumps not handling the constant back pressure. it will be easier to run a lower PSI EFI pump such as one from a N/A S4 if you want in tank or 200sx external pump that run 25-35psi by design.

1badFB

iTrader: (1)

I run 3.5 PSI on my GSL-SE fuel system with this:

http://aeromotiveinc.com/products-pa...***-regulator/

Works great with my 48IDA and gives me the option for boost in the future

jshook82

iTrader: (5)

I'm using a Walbro 255 with 5/16 feed to an aeromotive 13301 coupled with a new 5/16 return and I can't get my pressure down below 12psi. I have the regulator all the way backed out with the 0-20 psi spring in it. Whats go me is that i ran this setup with a stock SE pump and had no problem. Is the walbro's flow of 280 L/hr too much for the 5/16 return?

PercentSevenC

If you're using a stock 12A tank, the inlet for the return is only 1/4". It could be causing too much of a bottleneck. If you still have the -SE pump, though, that should be plenty for any carb setup.

jshook82

iTrader: (5)

If using an SE tank is there anything at the tank that would be stopping the flow back into the tank itself? Or does a walbro just flow to much for the stock 5/16 lines?

PercentSevenC

AFAIK the return for the -SE is 5/16" all the way into the tank.
I doubt it since you said you're running 5/16" for the send line as well. As long as your send is the same size or smaller than your return there should be no problem as long as your FPR can handle it. Even with my setup where the return has some restriction, I was sitting at ~1 PSI when I tested it the first time with the engine off. But I don't have any direct experience with that pump or that FPR so I can't say for sure.

jshook82

iTrader: (5)

Thank you much sir. I guess the next step would be to drop the tank and see if there is an obstruction in the return fitting. I appreciate your perspective.

cshaw07

iTrader: (14)

ok guys, i have a parts list for my whole fuel system... less one part... whats the best (accurate) fuel pressure gauge I can buy?

jshook82

iTrader: (5)

I'm using the 0-15psi Aeromotive. i bought it from Amazon.com but check Summitracing.com as well.

jgrewe

iTrader: (1)

Get one that has the lowest range that will do the job. When they talk about margin of error type stuff the percentage number is based off the highest number on the gauge. So, a 100psi gauge with a 2% max error is 2 psi even at a 5 psi setting.

pinoyremix

i have a full gslse fuel setup powering my dellorto 48 dhla...with the mallory 4309 as a regulator...