RE:Stock Fuel System Performance Diagnosis!

Mine was swapped out under recall. Same on 2 different modules. I can grab the part number later but it looks new and really beefy when i unplugged it yesterday to depressurize the system.
 
I can bet that the pump swap will make no difference. What do I do after I change it? After this part being changed wouldn't the only factor left be the tune? I have been thinking about sending the injectors out for testing but I have already tested them for leaks. I could also force the lpfp to make 90 psi and have all the plugs out and check each one again if the initial test wasn't "good enough". At what point can I throw this back on LMS?
 
So you are comparing 12 volt output to see what the gpm is in a test set up to a running car which is 13.7 to 14.3 approx volts?

Shouldnt the running car get better pump output automatically?
 
Macgyver said:
So you are comparing 12 volt output to see what the gpm is in a test set up to a running car which is 13.7 to 14.3 approx volts?

Shouldnt the running car get better pump output automatically?
Click to expand...

From one of FoMoCo's the pump runs at 5 (or 5.5) and 12 volts which is controlled by the FDM.

Also there is more than enough fuel being supplied at 12 volts if it indeed gets ~14.1 volts.
 
polskifacet said:
StealBlueSho said:
Only things left...
Click to expand...
And the tune
Click to expand...

I thought tune and strategy were ruled out long ago...you had 2 different calibrations from 2 different tuners that showed low fuel pressure when those same 2 calibrations are fine in other cars with the same strategy
 
If its not the pump which I should know in a couple hours, you think the ecu is janky? Doesn't make sense if it was only janky when tuned. After this, there is nothing else to test?!?
 
Increased power when tuned puts more demand on the fuel system....dont know if its janky but i like that word....im of no help youve tested way more than i would have at this pointy
 
AJP turbo said:
Increased power when tuned puts more demand on the fuel system....dont know if its janky but i like that word....im of no help youve tested way more than i would have at this pointy
Click to expand...

Random thought, how does the pump 'receive' the signal and vary the output/pressure?  Does it use variable voltage?  Has there been voltage measurements on the line to the pump(s)? 

Also does the pump report 'back' its output?  And is that  return value wrong even though the physical pressure is good?

Crazy thoughts on allergy meds.. cheers
 
I hear you, hard to test all that with a doner SHO and oscilloscope. Also I get that hesitation when it drops real low so there must be something actually being funky.
 
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