fastcars95

iTrader: (9)

I was making some changes to my twin pump set-up and I noticed one of my pumps was a 190lph.
My fuel pressure drops above 5500rpm and I start to lean out.
Is it my pumps or something else in my fuel system.

Lonnies Performance

iTrader: (16)

Could be your pump capacity or your fuel system.

At 700RWHP the factory regulator design will not hold steady pressure at the rail.

I offer fuel system upgrades if interested.

fastcars95

iTrader: (9)

I'm not sure if its makes a difference but I have a Aeromotive Boost reference LT1 fuel pressure regulator.
I was thinking of changing my feed line to a -8 and using -8 lines to join to the fuel rails together.

I make just over 600whp now but I start leaning out and have to shut it down 1100 rpm early.

Lonnies Performance

iTrader: (16)

It makes a huge difference how the pumps are wired... if you just spliced 2 pumps together in the tank on a stock wire, you have a problem.

You also need a better power feed to the pumps from the battery.

I would worry about the pressure capability of the 190 pump.

The regulator should be OK.

I build custom dual pump kits if you want something guaranteed to work.
Feel free to give me a call.