stang_kllr

iTrader: (6)

So I got the fuel system plumbed in, and viola! No leaks! only 2 issues, the pump is loud as hell! oh well, I can deal with that, but now I need to mount my fuel return line from the regulator back to the tank. If I leave the pump on, it just over fills the carb, and so I left it off and ran out of fuel.

Question #1: Can I just run a -6 return (my feed is -8), to the top of the tank? Or will it create aeration when the fuel falls back down into the tank?

Question #2: What fuel pressure do you guys run? I was considering 7psi.

Anywho, here's a little video, ill get some better daylight ones up here soon.

TXsilverado

iTrader: (18)

i run 8psi only because i cannot regulate my pump down enough. what pump are you running? i run 8an feed and 6an return and my pump needs a larger return line.

menchaca

iTrader: (1)

7 psi is fine. If your carb is over filling like you are saying you need to adjust your floats. I always dead head my carb setups. But that is just what I do.

stang_kllr

iTrader: (6)

I am running the QFT 260 pump with -8 feed line. im plan to run a -6 return line.
so I need to adjust my floats? I thought that it was doing that because I have the pump on with no return line.

newschool72

iTrader: (12)

Whether you need to adjust the floats or not, depends on how much fuel pressure you are running. If the reg isn't set for something 8ish PSI or less (down to about 6 psi), the fuel pressure will overwhelm the needle and seat and pour fuel ! If the PSI is less than 8 psi, and its flooding, the floats could very well be set too high. Another cause for the flooding could be a little trash sticking the needle and seat open just a little. If its a brand new setup, the trash thing could very well be the issue, that is if the fuel pressure isn't too high. Good Luck !

TXsilverado

iTrader: (18)

i got trash im my needle/seat on an entirely new fuel and carb system. it just dumped gas. it's an easy thing to check for too. adjust the floats down and if it still over fills at the correct fuel pressure, check the needle/seat for some trash.

Prorac1

iTrader: (4)

Just pull the needle and seat and spray it with carb clean and rattle it around and make sure it is free. Than set the float with the engine running. Eric L

stang_kllr

iTrader: (6)

Thanx for the input guys. Ill have to get a low pressure gauge and check my fuel pressure. Im thinking that's what it is since the carb and regulator are set right out of the box and I haven't adjusted either. The fuel is coming up out of the front and rear tubes.

stang_kllr

iTrader: (6)

If I don't have a return line coming off my regulator, wont the pump keep pushing pressure against the carb and overfill it, if it has no way to relieve and return back to the tank?

Prorac1

iTrader: (4)

It will keep pushing 6 psi regulated pressure against the needle and seat, which it should have no problem handling.

stang_kllr

iTrader: (6)

oh I gotcha, I don't know much about carbs. did some more reading and im going to adjust my floats down and clean out the needle and seat to rule that out. maybe just too much fuel. thanx guys

stang_kllr

iTrader: (6)

it was just my floats. im a dumbass. thanx guys

menchaca

iTrader: (1)

Don't worry too much I have done it a couple times. Glad you got it figured out.

stang_kllr

iTrader: (6)

Got my floats set, but im seeing 11.5psi on fuel. I cant get the fuel pressure lower than 9psi with my regulator. Im running a holley hp 4.5-9psi. why am I seeing soo much pressure? I have the return hooked up as well. im running a qft 260 pump. any ideas?

Prorac1

iTrader: (4)

What is the head pressure of the pump? Eric L

Horsepwraddict

iTrader: (12)

The regulator may be bad also. I have had some regulators do really whacky things when they start to fail.

stang_kllr

iTrader: (6)

the max pressure is 18 psi. im using a 100 and a 40 micron filter. http://www.summitracing.com/parts/qft-30-260


well I was told that as well by someone else, but the regulator is literally brand new. maybe I can call summit and get a replacement sent to me

TXsilverado

iTrader: (18)

what size return line? any an fittings between the regulator and fuel tank? is the return line to the top of your cell, or to the bottom having to push it's way back into a tank full of fuel?

i have 8an feed and 6an return and cannot regulate below 7psi because my return line is too small for my aeromotive street/strip.

stang_kllr

iTrader: (6)

for now the return line is 3/8 hose. im going to make it in -6line all the way back. yes there are fittings from regulator to tank. I have a bulkhead off the tank, to the filter, to the pump, to another filter, to the reg then to the carb. right now the return line goes to a little gas tank I have. I have not routed it all the way to the tank just y et. but it will return to the top of the tank. my feed is dash 8 as well. maybe ill have to use a bigger return then?