camaroIroc

iTrader: (1)

i have a 5.3 with an ls6 cam tuned. Aeromotive regulator and walbro 255lph pump. Plummed all the way with 3/8" push loc, no leaks. Billet rails, ls1 injectors. Fuel filter is new.

My problem is that when i push the throttle, my psi drops way too much. I have it set at around 58-60psi at idle, but it goes as far as 0psi under wot. What should i do now?

I have a 17gal cell none sumped, the pickup is in the tank pulling from the top, maybe i should get a sumped setup? Or something else?

Any help is appreciated!

camaroIroc

iTrader: (1)

anybody??

98Camarod

iTrader: (43)

Is there another regulator in the tank?

camaroIroc

iTrader: (1)

nope...

98Camarod

iTrader: (43)

It drops to 0 or is that a typo?

Do you have the regulator after the rails? Do you have any pictures of the fuel system setup?

camaroIroc

iTrader: (1)

this is my setup, should me return line be routed off the back of the second rail instead of the original spot under the fpr? i cant think of anything else.

camaroIroc

iTrader: (1)

the more throttle i give it, by hand of course... the lower it goes and starts to stumble and fall on its face. 0 psi is no typo very close to it.

camaroIroc

iTrader: (1)

the only real answer i see coming is the pickup tube being restrictive under load...its kinda like a straw affect...maybe?

98Camarod

iTrader: (43)

Since you have the regulator, I would run the feed to the rail, run the cross over, then go to the FPR, and block off the other side. This puts the regulator after the rails making it a return system. Make sure that your tank is vented or has a way to vent.

camaroIroc

iTrader: (1)

i have a roll over vent.. does that normally vent until its upside down right? lol i can change my setup to the way your saying... i am thinking of also getting stock rails too.. those billet ones i got have acouple minor accumulations around the fittings of fuel. just cant get those npt fittings to seal up good.

camaroIroc

iTrader: (1)

like this?



i guess the only bad thing is i cant really get a stock ls2 rail... it is not a return style

98Camarod

iTrader: (43)

^^Thats right. I had to use quite a bit of thread tape on mine to prevent them from leaking. I'm not sure how the vent works, post up how it works out.

I think the way you have yours set up now is wrong and it works fine at idle, but it bleeds the pressure off when its changed demand.

camaroIroc

iTrader: (1)

if this works im gonna go and drink myself retarded... ive had a rough time getting my build on the road...and even came as far as selling it. it has alwasy died or stumbled after i give it throttle... i thought o2's but idk. thanks alot bro. i will post soon.

98Camarod

iTrader: (43)

Thats essentially how I have mine setup. You may have to adjust your regulator after you change it.

Don't sell it, you will loose your *** and you know it. Just step back and drink a few and laugh. Builds are fun, and they are projects.

02 BLK WS6

iTrader: (11)

This will allow your pump to run unrestricted and the regulator will control the amount returned to the cell. Idle will create a lot of return and WOT will be less return.

98Camarod

iTrader: (43)

How did that work out?

camaroIroc

iTrader: (1)

ive got it all hooked up now, and i cranked the car up. my guage is mounted on the front of the fpr, and it now reads 20psi. i tryed adjusting it both ways with the adjustment screw.. but nothing. is this normal in this setup? before it read 60psi at idle. am i doing something wrong?
i'll put a pic up tomorrow....

98Camarod

iTrader: (43)

It's adjustable, so it should be able to go from like 20 psi to 80 psi IIRC. Lets see some pictures, from feed path to the return path.

Old Geezer

iTrader: (3)

This is the correct way to hook it up...
Is the Walbro in the tank?
The vent valve, if in backwards, will cause the pump to eventually pull a vacuum on the tank, and take the pump out.
The valve is designed to do as you state. Vent when "right side up", close when "on your lid"..
If you are limited to 20psi w/ this layout, I'd look for issues between the rail and the pump pickup.

camaroIroc

iTrader: (1)

quick question, are walbro pumps loud? mines external. i can hear it, kinda loud.