2ktransam

iTrader: (12)

I just finished up installing twin intank 255's and I have a question. The setup is in a 01 Silverado with a return style fuel system. My question is should the fuel pressure increase from the base pressure when the second pump is on? At idle I normally have a base pressure of 54 and if I jump the hobbs switch my fuel pressure jumps to 75 at idle. I thought the regulator on the fuel rail would keep the fuel pressure at 54 until it sees boost? Is this normal? Can the stock return line not flow enough to bleed off the extra fuel pressure?

Lonnies Performance

iTrader: (16)

The regulator & return line are not up to the task of returning the flow for 2 pumps. It will cause a large pressure increase as you are seeing at idle. This is why you use a hobbs switch to bring the second pump on only after the engine is using a considerable amount of fuel.

2ktransam

iTrader: (12)

Thanks for the reply. I thought that might be the case so I drove it around for little bit with the hobbs switch set on 2psi and its working good.

1fast bird

iTrader: (22)

How's that truck running now?

2ktransam

iTrader: (12)

It's still slow. I'm going to put the new turbo on this week and see if I can't surpass the 600hp mark.

1fast bird

iTrader: (22)

Uh oh, you going bigger? Your truck was/is not slow, it's pretty nasty for a 5500 lbs. beast!

2ktransam

iTrader: (12)

Going bigger. I picked up a TC76 BB since the MP70 was maxed out. Hopefully it will hold together for Superstallions.

1fast bird

iTrader: (22)

I'm sure you will find the next weak link in it with 600 hp. What's next, twins? This truly is a disease! lol.....Let me know when you need to step up to 96lbs. injectors, cause I have a brand new set I won't be using.

2ktransam

iTrader: (12)

I should be fine with the 60's. With the new fuel pump setup and meth that should hold me over for quite a while. Now I need a forged bottom end and an 80e so I can shoot for 750-800.