Engine, Drivetrain & Forced-Induction
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DW300 Fuel Pump Pressure Problem

Old Jul 20, 2020 | 08:16 AM
  #16  
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SonicVQ
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Graph Layout:
• Engine RPM
• Target AFR
• AFRWB-B1 (Measured AFR Bank 1)
• InjDuty % (Injector Duty Cycle)
• AFRCorrB1 (AFR Correction Bank 1)

Other than the weird glitch at the last run to 6000+ RPM it looks good to me:
• Target and actual AFR are close
• Duty cycle is lower than I would expect, but this is not an issue due to target/actual AFR being close. This may be due to the higher volume pump increasing fuel pressure above stock.
• Not shown: Long term fuel trim is good. Min is 90 and max is 104


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Old Jul 20, 2020 | 08:46 AM
  #17  
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Graph Layout:
• Vehicle Speed (MPH)
• Engine RPM
• Battery Voltage
• LTFuelTrimB1 % (Long Term fuel trim Bank 1)
• LTFuelTrimB2 % (Long Term fuel trim Bank 2)

Your battery voltage is not very stable and low. It varies from 12.6 - 13.2 volts.
When I went drag racing (maximum engine load and electrical load) my battery voltage varied between 13.3 - 13.4 volts.
You may want to check that with a good meter, to verify.



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Old Jul 20, 2020 | 12:46 PM
  #18  
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I noticed that as well. Did you remove the grounding kit? If not, that would explain the low voltage (should bump it up .2 volts or so). Did you replace the upper/lower intake gaskets when swapping injectors? Another thing to consider is dropping in the stock full pump and do a comparison. An aftermarket pump is only needed when running e85/Nitrous/SC/TT in IMO.

Last edited by jdog78; Jul 20, 2020 at 06:55 PM.
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Old Aug 8, 2020 | 02:52 PM
  #19  
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I did have a grounding kit before. I removed it when i got a hint that the issue may be electrical. So I brought my alternator to get tested and sure enough it was bad. I replaced it but alas, this did not solve my fuel pressure issue. Yes i did replace all gaskets when doing my injectors. I only got a bigger pump because i was told "my fuel pump cannot compensate for the amount of fuel my ecu was pushing" or something along the lines of that. Next on my list is to get bigger injectors but i dont think this will fix it.

I have replaced my gas pedal (some forums suggested that this may be a issue)
as well as my throttle bodies. I do not believe there are any vacuum leaks and i do not smell any fuel in the cabin or in the bay. I even taped napkins around my dampener to see if gas would leak there under load.
I am measuring fuel pressure with a CJM Fuel tap and a AEM pressure gauge.

Maybe its my gas tank? My car has no codes and im chasing a ghost.
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