Fuel system problem???? Help!
06-11-2009, 04:55 PM
#1
Fuel system problem???? Help! I posted this in the "Fueling & Injection" section but figured I'd post it in here too since it does have to do with nitrous in a way.
Ok guys, I am running a stock cube LS1 with a single plane and a carb. For my fuel system I am running four separate -6 lines for the supplies and returns. I have an in tank walbro 255 feeding the motor and an in line walbro 255 feeding the two kits. (1 plate, 1 fogger).
Here's what's happening.... I can set the regulator to 5 psi, then make a dyno pull or track pass, check it after the run and the gauge will show 2 psi. OR 9 psi, OR 7.5 psi. It does stay consistant throughout the run/pull though. What is really weird is that if the fuel pressure drops 3 lbs on the nitrous side or raises 2 or 3 lbs it will do the same on the motor supply side! I have changed regulators, pumps (to a holley blue), and gauges.. I am running all of this out of the stock tank in my 99 Z28.
If any of you guys have any advice or suggestions I would GREATLY appreciate it. This problem is REALLY starting to **** me off...
Ok guys, I am running a stock cube LS1 with a single plane and a carb. For my fuel system I am running four separate -6 lines for the supplies and returns. I have an in tank walbro 255 feeding the motor and an in line walbro 255 feeding the two kits. (1 plate, 1 fogger).
Here's what's happening.... I can set the regulator to 5 psi, then make a dyno pull or track pass, check it after the run and the gauge will show 2 psi. OR 9 psi, OR 7.5 psi. It does stay consistant throughout the run/pull though. What is really weird is that if the fuel pressure drops 3 lbs on the nitrous side or raises 2 or 3 lbs it will do the same on the motor supply side! I have changed regulators, pumps (to a holley blue), and gauges.. I am running all of this out of the stock tank in my 99 Z28.
If any of you guys have any advice or suggestions I would GREATLY appreciate it. This problem is REALLY starting to **** me off...
06-11-2009, 05:22 PM
#3
Nope, two separate pumps with two separate feeds going to two separate regulators and going back to the tank in two separate returns....
I pretty much answered both questions with one answer there.
One is an in tank Walbro (For motor) and the other is an in-line Walbro (For nitrous).
I pretty much answered both questions with one answer there.
One is an in tank Walbro (For motor) and the other is an in-line Walbro (For nitrous).
06-11-2009, 05:35 PM
#4
Have you tried a certified flow gauge or are you just relying on a 25.00 machanical gauge? I see these cheap gauges fluctuate all the time.
I am also not a big fan of the holley style regulaters as on my 66 Chevy I can not tell you how many I went through before I got a good one. I had a problem with fuel pressure creep due to a crapy regulater.
What regulaters are you using?
Dave
I am also not a big fan of the holley style regulaters as on my 66 Chevy I can not tell you how many I went through before I got a good one. I had a problem with fuel pressure creep due to a crapy regulater.
What regulaters are you using?
Dave
