a4ls2goat

I'm having problems with my fuel pressure.
I'm having problems making my fuel pressure rise higher than 60psi.
No matter how high I set my base fuel pressure it doesn't seem to help.

Dual walbro 342 intank.
Both running full time.
Magnafuel regulator 1:1
-6 return,3/8 feed, stock fuel rails. 80lb injectors.

dschmittie1

iTrader: (64)

Whats your base pressure. Does it rise at all or rise and then start falling?

a4ls2goat

i set the base pressure at 62psi with the nipple off the regulator, than reconnect it after i set it.
it doesnt drop lower than 60psi. i will try and get a video

a4ls2goat

im running the WIX #33481 fuel filter after the pumps.
can this be restricting my flow?

realsquash

iTrader: (1)

If possible see if you can apply 10psi of air pressure to the boost connection on the FPR while the car is idling. Those pumps probably are bypassing around 65psi so you'll never be able to get above that if that's the case.

Andy

Ryans99ls1

iTrader: (16)

you sure both pumps are working?

a4ls2goat

The car previously made 600whp on e85 on the last setup so I'm sure they are both working.

alexc

Why do you want fuel pressure higher than 60???

The Alchemist

iTrader: (19)

Because he's running boost, so you want the pressure to increase incrementally with each pound of boost pressure.

alexc

I have dual walboros on my gto. One pump is on all the time and the second is on a hobbs switch to come on under boost. I believe the gtos have an in tank regulator that constantly tries to maintain factory ~58 psi which might be your problem. I set the regulator on my secondary pump to 60psi, enough to add fuel when needed but not too much to make the factory regulator wacky.

Jetn3

What fuel pressure gauge do you have?

I had a prosport evo fuel pressure gauge with a sender that looks like your sender. Gauge and sender was crap and read the same fuel pressure all the time even under boost. Got me a aem one now and all is good.

a4ls2goat

I removed the intank regulator along with the filter .

The gauge does move under boost.

JAX04

iTrader: (17)

So you have filters on the pumps then an after filter? Take that wix off of their. 3/8" what size is that comparable too in -AN? I ran two walbro gss340s in tank, -8 feed and stock line as return, i had zero problem at 15lbs of boost 78mm turbo on a 6.0.

a4ls2goat

yea, i run the socks on the pumps than the wix filter.
3/8' is the stock feed, i believe is a -6.

JAX04

iTrader: (17)

So a couple problems if you ask me. Id get a real pair of fuel rails, get a bigger feed line and ditch that second filter. Also, where is your manifold reference for the regulator?

a4ls2goat

skinnies has made over 800whp on stock rails, so im sure thats not the problem.

the regulator is referenced at the back of the intake mani, i have it T on it.

ill remove the second filter and see what it does.

JAX04

iTrader: (17)

Do you have the supply going straight through the regulator?

a4ls2goat

i dont understand your question, are you talking about the reference line for the regulator?

JAX04

iTrader: (17)

you have the line coming FROM the tank (supply) going into an inlet of the regulator. Im pretty sure they dont work that way. Atleast ive never seen one hooked up like that.

The people that ive seen that put a regulator on the rails hook it up to the -4an port on the end of the rail. regulating the rail.

a4ls2goat

i can still regulate the fuel pressure with it this way.