Gas Station / Octane / HPFP Questions

VisualCSharp · 10-29-2009, 10:06 AM

HPFP FAIL (4,300 miles) October 29, 2009
Model Year 2009
Shell/Chevron/Exxon / 93 / Texas
Refill Level (1/8)

I should note that the pump never actually failed, but I took my car in for service a couple of days ago for long cranks. The dealer (BMW of Austin) called BMW and got authorization to install a new HPFP. They tell me the long crank issue is gone. Going to pick up my car today.

EDIT: Long crank issue resolved. Car starts right up now.

tkbr0wn · 10-29-2009, 11:58 AM

Well, I got a REALLY long start today. Mine may finally be on the way out. I have never varied from Shell, Chevron, or QT. I do remember some long starts about this time last year. I took it in thinking it was the fuel pump and it ended up being a bad injector?
Seems odd that it is happening at the same time again this year. I still think it has something to do with the change from RFG (summer gas) to non RFG gas.

tkbr0wn · 02-01-2010, 11:24 AM

So, my fuel pump was finally replaced about a month ago and when I got the car back it was idling funny. They told me to wait two weeks to see if the car just needed to re-adapt but no luck, it kept doing it. I ended up having all six injectors replaced + new spark plugs. It runs fine now...
Once again, if it is just bad design on the fuel pump then why are the injectors failing? What do these parts have in common? Hmmmm, maybe the fuel?

tkbr0wn · 02-01-2010, 03:07 PM

Quote:

Originally Posted by TrackRat

When the HPFP starts to go bad the fuel pressure is lower than it should be. This can cause malfunctioning injectors and an uneven spray pattern on injection. If fuel sprays on the sparkplug it can damage the plug and also the ignition coil packs due to the peak voltage required to fire a fuel saturated plug. The bottom line is the N54 engine has a lot of issues surrounding the HPFP and related components.

That sounds reasonable, is there any possibility that bad injectors could cause a HPFP failure?

10-29-2009, 10:06 AM	#67
VisualCSharp New Member 5 Rep 24 Posts Drives: BMW 135i 6AT Join Date: Apr 2009 Location: Austin, TX iTrader: (0)	HPFP FAIL (4,300 miles) October 29, 2009 Model Year 2009 Shell/Chevron/Exxon / 93 / Texas Refill Level (1/8) I should note that the pump never actually failed, but I took my car in for service a couple of days ago for long cranks. The dealer (BMW of Austin) called BMW and got authorization to install a new HPFP. They tell me the long crank issue is gone. Going to pick up my car today. EDIT: Long crank issue resolved. Car starts right up now. Last edited by VisualCSharp; 11-02-2009 at 12:01 PM..
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10-29-2009, 11:58 AM	#68
tkbr0wn Major 72 Rep 1,239 Posts Drives: 2015 Cayman S Join Date: Jun 2008 Location: Atlanta iTrader: (0)	Well, I got a REALLY long start today. Mine may finally be on the way out. I have never varied from Shell, Chevron, or QT. I do remember some long starts about this time last year. I took it in thinking it was the fuel pump and it ended up being a bad injector? Seems odd that it is happening at the same time again this year. I still think it has something to do with the change from RFG (summer gas) to non RFG gas. __________________ ● 2015 Cayman S (Current), 2011 1M BSM #297 (Sold), 2008 135i (Sold) ●
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02-01-2010, 11:24 AM	#69
tkbr0wn Major 72 Rep 1,239 Posts Drives: 2015 Cayman S Join Date: Jun 2008 Location: Atlanta iTrader: (0)	So, my fuel pump was finally replaced about a month ago and when I got the car back it was idling funny. They told me to wait two weeks to see if the car just needed to re-adapt but no luck, it kept doing it. I ended up having all six injectors replaced + new spark plugs. It runs fine now... Once again, if it is just bad design on the fuel pump then why are the injectors failing? What do these parts have in common? Hmmmm, maybe the fuel? __________________ ● 2015 Cayman S (Current), 2011 1M BSM #297 (Sold), 2008 135i (Sold) ●
	Appreciate 0 Quote