P228D HPFP 25 mpa at idle LT4 C7Z

[tkayrc3]

having a weird issue with rail pressure,
2016 C7 Z06
full tilt Lt4 blower package
Ported blower
Camshaft w/38% lobe
Aux kit & flex
done a bunch of these with this set up never seen this issue before.

Rail pressure commanded is 5 Mpa
Rail pressure reading 24 Mpa

getting a p228D high fuel pressure code, then goes into Reduced engine power..

checked preload on HPFP, all good added a .050" lash cap
2 new lt4 pumps
new rail pressure sensor
wiring is all good

Does it with completely stock file and with base map..

Short idle log attached:

High_idle_rail_pressure.hpl

[Will27cy]

having same issue but mine is a l83 stock fuel lobe and NA. just did a cam kit and getting this code. fuel rail pressure reading 2000psi when desired i think is suppose to be around 800. let me know what you findnew log file base tune 1.hpl

[Eng.LSX]

Have you figured this out ? Having the exact issue .

[Flecha Performance]

any news on this?

[TriPinTaZ]

Did you adjust the leading edge table to account for the fuel lobe?

[32vape]

How much preload do you have on the pump when the cam is on the flat? With a 38% lobe, you only want about .020".

[Flecha Performance]

Did you adjust the leading edge table to account for the fuel lobe?

i emailed you!

[TriPinTaZ]

OK I'll try to take a look this weekend

[Eng.LSX]

Had this issue awhile back and turned out it was the check valve , just deleted it and it's solved .

[Flecha Performance]

Had this issue awhile back and turned out it was the check valve , just deleted it and it's solved .

What check valve?

[Estep40511]

Check valve in the main fuel line going to HPFP. Could also be a leaking HPFP or injector too. If you took injectors out for any reason, sometimes they leak when you reinstall. Fuel pump will do it too. Dont know why they are so fragile. See it alot on the OEM side here at work.

[Eng.LSX]

Check valve in the main fuel line going to HPFP. Could also be a leaking HPFP or injector too. If you took injectors out for any reason, sometimes they leak when you reinstall. Fuel pump will do it too. Dont know why they are so fragile. See it alot on the OEM side here at work.

This.

[Flecha Performance]

This.

will try that. thank you

[Rennat_2006]

What did you end up figuring out?
Ive got a 2014 6.2l silverado that im fighting this code and p0089 code on after a cam swap.

I did have the hpfp and fuel rails out of the heads. Installed new seals on bottom of injectors. Whats the best way to check for leaks in both of these after reading post above about them being fragile.

[Estep40511]

What did you end up figuring out?
Ive got a 2014 6.2l silverado that im fighting this code and p0089 code on after a cam swap.

I did have the hpfp and fuel rails out of the heads. Installed new seals on bottom of injectors. Whats the best way to check for leaks in both of these after reading post above about them being fragile.

P0089 is more than likely the fuel rail pressure sensor, or wiring in that harness. check the terminals in the connector going to the fuel rail pressure sensor, if it looks good, Id replace the sensor.

[Rennat_2006]

P0089 is more than likely the fuel rail pressure sensor, or wiring in that harness. check the terminals in the connector going to the fuel rail pressure sensor, if it looks good, Id replace the sensor.

Thank you very much. I will get into it later today hopefully.

I noticed on scanner that low pressure fuel sensor would constantly bounce around anywhere from 0 to 100 psi. High pressure would always be around 1100 or so.

[Racerbox77]

Thank you very much. I will get into it later today hopefully.

I noticed on scanner that low pressure fuel sensor would constantly bounce around anywhere from 0 to 100 psi. High pressure would always be around 1100 or so.

Did you get this figured out?

[Rennat_2006]

Yes and No. Ran through a bunch of troubleshooting from GM testing the regulator on the pump, wiring to and from the ecm to it, etc. I can control the regulator and raise pressure but cant get pressure to come down from around 1000-1100. According the GM they say replace the pump.

Pumps from GM and every aftermarket manufacturer are all back ordered with no ETA. Ive called about 30 GM dealerships that show they have one but everyone has said they are already invoiced/sold to customers and they have other customers/vehicles in their shop waiting for future orders.

Some more information ive found is these pumps seem to fail one of 2 ways, Regulator issues like what it appears mine is having and pump itself leaks fuel into the crankcase. The regulators are a bolt on deal to the pump but nobody ive been able to find so far will service them seperately.