Help with rail pressure

Black_n54 · 01-22-2021, 06:42 PM

I noticed that After some pulls and when I come to idle my rail pressure will jump up to 2300 psi and a notable ticking coming from the high pressure fuel pump area but if I tap the gas it goes away. This is a newer fuel pump that I just changed because I thought my last one was failing because of the same issue so I know it's not the high pressure fuel pump can anybody tell me an idea on what they think it is

TunafishE93 · 01-22-2021, 06:47 PM

You have custom tune or running stock?

Black_n54 · 01-22-2021, 11:20 PM

Quote:

Originally Posted by TunafishE93

You have custom tune or running stock?

Just MHD stage 2 with basic bolt ons

TunafishE93 · 01-23-2021, 12:49 AM

Try a different map or back to stock, see if it tune related. Easy and free to get that out of the way.

feuer · 01-23-2021, 11:15 AM

Normal operation I think. Fuel system doesn’t have return line back into tank. Doing WOT would demand a lot of fuel. Then you are at idle.

TunafishE93 · 01-23-2021, 11:34 AM

I never considered this, if you do a pull then all of sudden go off throttle the rail pressure will stay high until pressure is release. I have always drove after a pull so never experienced this.

01-22-2021, 06:42 PM	#1
Black_n54 New Member 0 Rep 23 Posts Drives: 2010 bmw 335i Join Date: Sep 2020 Location: New Jersey iTrader: (0)	Help with rail pressure I noticed that After some pulls and when I come to idle my rail pressure will jump up to 2300 psi and a notable ticking coming from the high pressure fuel pump area but if I tap the gas it goes away. This is a newer fuel pump that I just changed because I thought my last one was failing because of the same issue so I know it's not the high pressure fuel pump can anybody tell me an idea on what they think it is
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01-22-2021, 06:47 PM	#2
TunafishE93 Major 418 Rep 1,152 Posts Drives: BMW 335i Join Date: Dec 2019 Location: NV iTrader: (0)	You have custom tune or running stock?
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01-23-2021, 12:49 AM	#4
TunafishE93 Major 418 Rep 1,152 Posts Drives: BMW 335i Join Date: Dec 2019 Location: NV iTrader: (0)	Try a different map or back to stock, see if it tune related. Easy and free to get that out of the way.
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01-23-2021, 11:15 AM	#5
feuer Major General 4276 Rep 9,206 Posts Drives: wife crazy! Join Date: Apr 2015 Location: Chicago, IL iTrader: (5)	Normal operation I think. Fuel system doesn’t have return line back into tank. Doing WOT would demand a lot of fuel. Then you are at idle.
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01-23-2021, 11:34 AM	#6
TunafishE93 Major 418 Rep 1,152 Posts Drives: BMW 335i Join Date: Dec 2019 Location: NV iTrader: (0)	I never considered this, if you do a pull then all of sudden go off throttle the rail pressure will stay high until pressure is release. I have always drove after a pull so never experienced this.
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