Well, I finally installed my fuel pressure gauge.
At idle, I am getting 58-60 psi. Driving around & partially agressive driving, the same.
WOT above 5,000 to 6,400 it drops to 52psi.
I have the walbro 255 intank. Are my readings normal?
Well, I finally installed my fuel pressure gauge.
At idle, I am getting 58-60 psi. Driving around & partially agressive driving, the same.
WOT above 5,000 to 6,400 it drops to 52psi.
I have the walbro 255 intank. Are my readings normal?
Gone, but not forgotten!
If I remember correctly the fuel pressure on the Chiltons book said 52-62 PSI. Sounds like its running out of fuel if its losing pressure, though. You have a one line fuel rail, returnless, correct?
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
Correct.Originally Posted by RedHeartbeat
Gone, but not forgotten!
One thing to check is the charge voltage at those RPMs. As the voltage drops your gauge will read lower and the fuel pump will be less efficient.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
Are you talking about adding a voltage booster, like a Magnavolt or something?
Gone, but not forgotten!
I have one if you want to try it. I think it is just a bandaid. How much fuel in the tank. I think he might mean check the voltage at the connector by the tank and see what voltage it is at WOT. I have the same fuel pump as you and get no pressure drop at WOT.
2006 Superior Blue Trailblazer SS AWD, Stock as a rock
Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).
Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning
But I am still within the spec'd range, so that shouldn't be a big deal. Right?
Makes me think that at 10psi + I ran out of fuel. Then my engine ran outta pistons.
Gone, but not forgotten!
It could just need the ground tightened or the plug cleaned at the tank. It might be fine and just richen the tune to compensate.
2006 Superior Blue Trailblazer SS AWD, Stock as a rock
Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).
Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning
The PCM may be commanding the alternator to quit charging during performance mode and that kills voltage to the fuel pump. The voltage booster can help for sure. My radio has a display mode for voltage on it that is digital. I can turn it on and watch the voltage during high RPM runs. A digital multimeter setup in the cab of the truck can show the same thing, watch for dropping voltage during WOT runs.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
I have never heard of that before!
I guess it will try to see if my Interceptor gauge tells me anything (because I am lazy and don't want to crawl under the truck).
Gone, but not forgotten!
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