Fuel pressure not increasing in boost?

[tdd]

My regulator does not seem to be raising fuel pressure in boost in a 1:1 ratio as advertised. With base fuel pressure set to 47psi, It seems to be doing just fine in vacuum though.i changed fpr and still getting inj duty cycle alarm, changed fuel tank & filter replaced rubber lines and still no change Any thoughts

 

[Chuck Leeper]

Change the pump, too?

 

[tdd]

Change the pump, too?

yeah pump isn't 3 months old racetronix 255

 

[Mr.Spool]

My regulator does not seem to be raising fuel pressure in boost in a 1:1 ratio as advertised. With base fuel pressure set to 47psi, It seems to be doing just fine in vacuum though.i changed fpr and still getting inj duty cycle alarm, changed fuel tank & filter replaced rubber lines and still no change Any thoughts

Voltage to the pump

 

[tdd]

Voltage to the pump
[/QUOT
went over a few things its rising ,just the longer I stay in it the pressure drops

 

[TurboTGuy]

Is the car modded, maybe that 255 is a li'l too small?

 

[tdd]

Is the car modded, maybe that 255 is a li'l too small?

yeah a lil bit

 

[TurboTGuy]

Mr. Spool mentioned pump voltage. A hot wire kit for the pump can't hurt. It's a pretty basic install.

 

[Column Shift Killa]

How big are the injectors ?


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[tdd]

Mr. Spool mentioned pump voltage. A hot wire kit for the pump can't hurt. It's a pretty basic install.

I have a hot wire kit

 

[tdd]

How big are the injectors ?


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60s hot wire kit racetronix 255lph pump,champion iron heads champion intake,6262 turbo,

 

[Clark6]

60lb.i see now ,,,I had this problem 2 weeks ago... I have 80lbs inj. with a Supra pump... wasnt going past 53 fuel psi at 20 boost... I decided turn up the boost a pump to 15volts. walaa.. problem solved.

 

[Clark6]

td do you have good connections & new wiring & connectors back there to the pump? I wonder if you can monitor voltage with powerlogger on a pull to see if the voltage is going down the faster you go.hmmmmm

 

[tdd]

td do you have good connections & new wiring & connectors back there to the pump? I wonder if you can monitor voltage with powerlogger on a pull to see if the voltage is going down the faster you go.hmmmmm

screen shot 77 is where the inj duty cycle alarm came on from a few days ago 76 is from yesterday

 

[Chuck Leeper]

Has the noise attenuator been replaced with the short hose?
Is the restriction nipple cut off of supply tube?
Short hose from pump to hanger loose, split?
Tank vent open?

 

[mommasGN]

did you ever figure this issue out?

 

[tdd]

did you ever figure this issue out?

Fuel pump

 

[87geeinn]

Your voltage is low, especially at that RPM. It almost looks like you're running on battery alone since with an alternator running, your voltage should be in the mid 13s or higher. FP looks to be dropping off as voltage decreases too. Not necessarily correlation = causation but that's what immediately stands out to me. I'd start by having a look at your alternator and the rest of the electrical system.